{"title":"Suzuki 4-Stroke 100-300HP Outboard Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eThis page is for Suzuki 4-Stroke 100–300HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Suzuki collection. Scroll to the bottom of the page to start browsing parts for this engine, and remember: on the collection page you can use the “Filter \u0026amp; Sort” controls to narrow results by horsepower, year range, and part category\/section.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-outboard-parts\" style=\"display:inline-block;background:#0a5;border-radius:6px;color:#fff;padding:10px 14px;text-decoration:none;\"\u003eBrowse All Suzuki Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eHow to Identify Your 100–300HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the nameplate\/serial number tag on the transom bracket (port side) or swivel bracket. The full model code and serial help verify parts.\u003c\/li\u003e\n    \u003cli\u003eRead the model code and suffix: “DF” indicates 4‑stroke; the number is horsepower (e.g., DF100\/115\/140\/150\/175\/200\/225\/250\/300). Suffix letters often denote shaft length, rotation (standard vs. counter), and control type (mechanical vs. electronic\/precision control).\u003c\/li\u003e\n    \u003cli\u003eDistinguish platforms: most 100–175HP are inline‑4 EFI 4‑strokes; 200–300HP are commonly V6 EFI 4‑strokes (some markets also have an inline‑4 DF200A). Cowling size, intake layout, and rigging connectors can differ.\u003c\/li\u003e\n    \u003cli\u003eFor 4‑stroke models, confirm features like the engine oil dipstick\/filter location and gearcase style; these details can affect service parts and seal kits.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"platforms\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n\n  \u003ch3\u003eInline‑4 EFI 4‑Stroke (typically 100–175HP, select 200HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;max-width:980px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInline‑4, EFI 4‑stroke outboards designed for efficient cruising and mid‑range torque.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eDF100\/115\/140\/150\/175 and some DF200A variants (market\/year dependent).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eLighter weight and good fuel economy for their class; straightforward service access; many shared service parts within the family.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eMatch parts by full model code and serial. Revisions exist across years; filters, anodes, and cooling items often cross, while internals, sensors, and rigging can differ.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eV6 EFI 4‑Stroke (typically 200–300HP, incl. DF300\/DF300AP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;max-width:980px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eV6 EFI 4‑stroke with chain‑driven camshafts and electronic ignition; some variants offer selective rotation and electronic throttle\/shift.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eDF200\/225\/250\/300 families, including DF300AP variants (year\/market specific).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eStrong top‑end power with smooth V6 operation; robust timing chain system; shared service parts across many V6 serial ranges.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eControl type (mechanical vs. electronic), rotation, and gearcase options affect harnesses, sensors, and prop selections. Always verify by model code and serial number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for Suzuki 4‑stroke outboards; always follow the official service manual for your exact model and operating conditions.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;max-width:980px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEngine oil \u0026amp; filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eUse marine 4‑stroke oil meeting Suzuki specs; warm engine before draining; replace filter and sealing washers as needed.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-service-maintenance-kits\"\u003eSuzuki Service \u0026amp; Maintenance Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect for water intrusion (milky oil) and metal on the drain plug magnet; renew drain\/fill gaskets; service seals if contamination is found.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-lower-unit-seal-kits\"\u003eSuzuki Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect at 100 hrs; replace as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eVerify correct heat range and gap for your model\/serial. Replace sooner if misfire or hard starting occurs.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-spark-plug\"\u003eSuzuki Spark plug\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eFuel filter(s)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eReplace in‑line and engine‑mounted filters; inspect VST filter\/screen where equipped; use fresh, clean fuel.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-fuel-filters\"\u003eSuzuki Fuel filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWater pump impeller\/kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e200 hrs or 2–3 seasons\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eService more often in sandy\/silty or shallow environments; confirm strong telltale flow after service.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-water-pump-repair-kits\"\u003eSuzuki Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eAnodes (internal \u0026amp; external)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect every 50 hrs; replace at ≥50% depletion\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eChoose the correct alloy for your waters (salt, brackish, fresh). Keep mounting surfaces clean for good contact.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-anodes\"\u003eSuzuki Anodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-service-maintenance-kits\"\u003eRoutine Service Kits\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-water-pump-repair-kits\"\u003eCooling System (Water Pump Kits)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-fuel-filters\"\u003eFuel System (Filters)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-rectifiers\"\u003eIgnition \/ Electrical (Rectifiers \u0026amp; Charging)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-anodes\"\u003eCorrosion Protection (Anodes)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-propellers\"\u003ePropellers \u0026amp; Hardware\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-lower-unit-seal-kits\"\u003eLower Unit Seals \u0026amp; Gaskets\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;max-width:980px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWeak telltale or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect intake screens, thermostat, and water pump condition; confirm proper hose routing and flush regularly.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWater pump kit, thermostat, intake screens, flush plug\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck prop condition\/pitch, fuel quality, filters, and spark plugs; scan for stored faults if available.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003ePropeller, fuel filters, injectors, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eVerify battery state and connections; inspect plugs; ensure clean fuel; check IAC\/throttle body cleanliness.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eStarter motor, spark plugs, fuel filters, battery cables\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eGearcase noise or metal in oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eDrain and inspect gear lube; look for water intrusion; check prop shaft for fishing line damage to seals.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSeal kit, bearings, gear lube, water pump base\/gaskets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eBattery not charging\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect rectifier\/regulator connectors, grounds, and stator output; test battery health.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eRectifier\/regulator, stator, battery cables\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eMany routine items (filters, plugs, anodes, some cooling and ignition parts) cross within the inline‑4 family and within the V6 family. However, internal components, sensors, control\/rigging parts, and some fuel system pieces vary by model code and serial range. Always match by full model and serial.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule of thumb, every 200 hours or 2–3 seasons, whichever comes first. Replace sooner if you run in sandy\/silty water, see a weak telltale, or after any overheat event.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eAt least every 100 hours or annually. Inspect the drained oil for water (milky appearance) and for metal on the magnetic plug. If contaminated, service seals and recheck after a short run.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information do you need to confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003ePlease provide the full model code, serial number, shaft length and rotation, and control type (mechanical vs. electronic\/precision control). Photos of the nameplate and the part needed are very helpful.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eReady to find parts for your Suzuki 4‑stroke 100–300HP outboard? Browse the main Suzuki collection by horsepower, year, and model.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/suzuki-outboard-parts\" style=\"display:inline-block;background:#0a5;border-radius:6px;color:#fff;padding:10px 14px;text-decoration:none;\"\u003eShop Suzuki Outboard Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px;color:#555;\"\u003eIf you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"thermostat-50-c-fits-suzuki-outboards-100-300-hp-replaces-17670-90j21-17670-90j20","title":"Suzuki Outboard Thermostat 50°C (122°F) – 100–300 HP, Replaces 17670-90J21 and 17670-90J20","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis replacement \u003cstrong\u003eSuzuki outboard thermostat\u003c\/strong\u003e is designed for 50°C (122°F) operation and is listed for Suzuki four-stroke outboards from 100 to 300 HP. The thermostat helps regulate engine operating temperature by controlling coolant flow through the cooling system.\u003c\/p\u003e\n  \u003cp\u003eCompany fitment information covers Suzuki outboard applications rated at 100, 115, 140, 150, 175, 200, 250, and 300 HP. Catalog references also identify the 50°C thermostat for selected DF115, DF140, and DF150 four-stroke applications. Always verify the complete model designation, year, and serial-number range before ordering.\u003c\/p\u003e\n  \u003cp\u003eThis aftermarket thermostat replaces Suzuki OEM part numbers \u003cstrong\u003e17670-90J21\u003c\/strong\u003e and \u003cstrong\u003e17670-90J20\u003c\/strong\u003e.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e50°C (122°F) thermostat for Suzuki four-stroke outboards.\u003c\/li\u003e\n    \u003cli\u003eListed for 100–300 HP Suzuki outboard applications.\u003c\/li\u003e\n    \u003cli\u003eDirect-replacement design for the referenced thermostat applications.\u003c\/li\u003e\n    \u003cli\u003eHelps maintain the engine's intended operating temperature when properly installed.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse the following references when comparing the thermostat removed from your engine.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n          \u003cth\u003eReference\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSuzuki\u003c\/td\u003e\n          \u003ctd\u003e17670-90J21\u003c\/td\u003e\n          \u003ctd\u003eOEM reference for a 50°C thermostat\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSuzuki\u003c\/td\u003e\n          \u003ctd\u003e17670-90J20\u003c\/td\u003e\n          \u003ctd\u003eAdditional OEM reference listed for this replacement\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eThe company catalog lists this thermostat for Suzuki outboards rated at 100–300 HP, including 100, 115, 140, 150, 175, 200, 250, and 300 HP applications. The examples below are provided as reference points rather than a complete model-year list.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Compatible Suzuki Outboard Applications\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003eApplication\u003c\/th\u003e\n          \u003cth\u003eRated HP\u003c\/th\u003e\n          \u003cth\u003eStroke\u003c\/th\u003e\n          \u003cth\u003eTemperature\u003c\/th\u003e\n          \u003cth\u003eOEM Part No.\u003c\/th\u003e\n          \u003cth\u003eVerification\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSuzuki\u003c\/td\u003e\n          \u003ctd\u003eDF100 and other listed 100 HP applications\u003c\/td\u003e\n          \u003ctd\u003e100\u003c\/td\u003e\n          \u003ctd\u003eFour-stroke\u003c\/td\u003e\n          \u003ctd\u003e50°C (122°F)\u003c\/td\u003e\n          \u003ctd\u003e17670-90J21 \/ 17670-90J20\u003c\/td\u003e\n          \u003ctd\u003eVerify model, year, and serial number\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSuzuki\u003c\/td\u003e\n          \u003ctd\u003eDF115 series\u003c\/td\u003e\n          \u003ctd\u003e115\u003c\/td\u003e\n          \u003ctd\u003eFour-stroke\u003c\/td\u003e\n          \u003ctd\u003e50°C (122°F)\u003c\/td\u003e\n          \u003ctd\u003e17670-90J21\u003c\/td\u003e\n          \u003ctd\u003eCatalog-confirmed examples include selected 2013–2021 models\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSuzuki\u003c\/td\u003e\n          \u003ctd\u003eDF140 series\u003c\/td\u003e\n          \u003ctd\u003e140\u003c\/td\u003e\n          \u003ctd\u003eFour-stroke\u003c\/td\u003e\n          \u003ctd\u003e50°C (122°F)\u003c\/td\u003e\n          \u003ctd\u003e17670-90J21\u003c\/td\u003e\n          \u003ctd\u003eCatalog-confirmed examples include selected 2013–2021 models\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSuzuki\u003c\/td\u003e\n          \u003ctd\u003eDF150 series, including listed DF150ST application\u003c\/td\u003e\n          \u003ctd\u003e150\u003c\/td\u003e\n          \u003ctd\u003eFour-stroke\u003c\/td\u003e\n          \u003ctd\u003e50°C (122°F)\u003c\/td\u003e\n          \u003ctd\u003e17670-90J21\u003c\/td\u003e\n          \u003ctd\u003eVerify the exact model and serial range\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSuzuki\u003c\/td\u003e\n          \u003ctd\u003eDF175T and other listed 175 HP applications\u003c\/td\u003e\n          \u003ctd\u003e175\u003c\/td\u003e\n          \u003ctd\u003eFour-stroke\u003c\/td\u003e\n          \u003ctd\u003e50°C (122°F)\u003c\/td\u003e\n          \u003ctd\u003e17670-90J21 \/ 17670-90J20\u003c\/td\u003e\n          \u003ctd\u003eVerify the exact model and serial range\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSuzuki\u003c\/td\u003e\n          \u003ctd\u003eOther listed 200, 250, and 300 HP applications\u003c\/td\u003e\n          \u003ctd\u003e200–300\u003c\/td\u003e\n          \u003ctd\u003eFour-stroke\u003c\/td\u003e\n          \u003ctd\u003e50°C (122°F)\u003c\/td\u003e\n          \u003ctd\u003e17670-90J21 \/ 17670-90J20\u003c\/td\u003e\n          \u003ctd\u003eConfirm the application against the engine parts diagram\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n    \u003cdd\u003eEngine thermostat\u003c\/dd\u003e\n    \u003cdt\u003eApplication\u003c\/dt\u003e\n    \u003cdd\u003eSuzuki four-stroke outboards, listed 100–300 HP applications\u003c\/dd\u003e\n    \u003cdt\u003eOpening Temperature\u003c\/dt\u003e\n    \u003cdd\u003e50°C (122°F)\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n    \u003cdd\u003eDirect replacement; confirm housing and gasket requirements before installation\u003c\/dd\u003e\n    \u003cdt\u003eOEM References\u003c\/dt\u003e\n    \u003cdd\u003e17670-90J21 and 17670-90J20\u003c\/dd\u003e\n    \u003cdt\u003eReplacement Type\u003c\/dt\u003e\n    \u003cdd\u003eAftermarket replacement, not a Suzuki-branded OEM component\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x 50°C (122°F) engine thermostat\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eA gasket or O-ring is not confirmed as included. Replace the sealing component as required by the engine service procedure.\u003c\/p\u003e\n\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eAllow the outboard to cool completely before beginning service. Follow the manufacturer's safety procedures and disconnect the battery where appropriate.\u003c\/li\u003e\n    \u003cli\u003eConfirm the engine model, year, serial number, and existing thermostat part number before removing the old part.\u003c\/li\u003e\n    \u003cli\u003eLocate the thermostat housing and place a suitable drain pan beneath the service area.\u003c\/li\u003e\n    \u003cli\u003eRemove the housing cover carefully. Keep track of fasteners and note the original thermostat orientation.\u003c\/li\u003e\n    \u003cli\u003eRemove the old thermostat and sealing component. Clean the mating surfaces without scratching the housing.\u003c\/li\u003e\n    \u003cli\u003eInstall the new thermostat in the same orientation as the original and install the correct new gasket or O-ring if required.\u003c\/li\u003e\n    \u003cli\u003eReinstall the housing cover and tighten the fasteners to the torque specified in the engine service manual.\u003c\/li\u003e\n    \u003cli\u003eRestore any removed hoses or components and run the engine according to the manufacturer's procedure.\u003c\/li\u003e\n    \u003cli\u003eCheck for leaks and confirm that water flow and engine temperature remain within the normal operating range.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat temperature does this thermostat open at?\u003c\/summary\u003e\n    \u003cp\u003eThis thermostat is specified for a 50°C (122°F) opening temperature.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich Suzuki outboards is this thermostat for?\u003c\/summary\u003e\n    \u003cp\u003eThe company fitment listing covers Suzuki outboards rated at 100, 115, 140, 150, 175, 200, 250, and 300 HP. Selected DF115, DF140, and DF150 four-stroke applications are also identified in engine catalog references. Verify the complete model, year, and serial-number range before purchase.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich OEM numbers does this replacement correspond to?\u003c\/summary\u003e\n    \u003cp\u003eThe listed OEM references are Suzuki 17670-90J21 and 17670-90J20. Match the number and physical configuration with the thermostat removed from your engine.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes the thermostat include a gasket?\u003c\/summary\u003e\n    \u003cp\u003eNo gasket or O-ring is confirmed as included with this thermostat. Check the service manual and replace the sealing component as required for your engine.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the signs of a failed thermostat?\u003c\/summary\u003e\n    \u003cp\u003eA thermostat that is stuck closed may contribute to overheating, while one that is stuck open may cause slow warm-up or an engine that does not reach its intended operating temperature. Inspect the cooling system and follow the engine manufacturer's diagnostic procedure.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a genuine Suzuki OEM part?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is for an aftermarket replacement thermostat. Suzuki part numbers are shown only as compatibility references.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I install it myself?\u003c\/summary\u003e\n    \u003cp\u003eInstallation should be performed only by someone familiar with marine engine service procedures. Use the correct torque specifications and sealing components; professional installation is recommended if you are unsure.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the shipping and warranty terms?\u003c\/summary\u003e\n    \u003cp\u003eAvailable shipping, returns, and warranty coverage are determined by the store policy displayed at checkout and on the applicable policy pages.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eConfirm the complete engine model, year, serial-number range, and thermostat configuration before ordering.\u003c\/li\u003e\n    \u003cli\u003eDo not rely on horsepower alone to establish fitment.\u003c\/li\u003e\n    \u003cli\u003eCompare the old thermostat, housing, and sealing arrangement before installation.\u003c\/li\u003e\n    \u003cli\u003eThis is an aftermarket replacement and is not manufactured or branded by Suzuki.\u003c\/li\u003e\n    \u003cli\u003eNever operate an outboard with a suspected cooling-system fault or temperature problem.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We provide replacement components for a range of marine service applications.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Information\u003c\/strong\u003e — Product references and fitment guidance are provided to help you compare the part with your engine.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSupport for Installation Planning\u003c\/strong\u003e — Always use the appropriate engine service information and professional assistance when required.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718260363579,"sku":"21TH023","price":26.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/21TH023_1_dc0e8bd5-6c9c-49f7-8375-22082f558e17.jpg?v=1762958287"}],"url":"https:\/\/seasierra.com\/collections\/suzuki-4-stroke-100-300hp-outboard-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}