{"title":"Johnson 43HP 2-Stroke Outboard Engine Parts","description":"\u003csection id=\"hero\" style=\"max-width:1100px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003cp\u003eThis page is tailored for Johnson 43HP 2-Stroke outboard engines. Use it to find compatible parts, recommended service items, and quick troubleshooting tips. You can also browse the main Johnson\/Evinrude collection for a wider selection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the Filter \u0026amp; Sort controls to narrow results by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude\" style=\"display:inline-block;margin-top:8px;padding:10px 14px;background:#0b6efd;color:#fff;text-decoration:none;border-radius:4px;\"\u003eBrowse All Johnson Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"max-width:1100px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 43HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eNameplate location: Look on the transom or swivel bracket for the model\/serial plate; some decals may also be on the clamp bracket.\u003c\/li\u003e\n    \u003cli\u003eReading the code: Johnson\/Evinrude model suffix letters often indicate shaft length (S=15\", L=20\", X=25\") and control type (tiller\/remote). Year codes vary by era—use the full model string for accuracy.\u003c\/li\u003e\n    \u003cli\u003e2‑Stroke specifics: Most engines in this class are carbureted; depending on year, your motor may be premix (commonly 50:1) or fitted with an oil‑injection (VRO) system.\u003c\/li\u003e\n    \u003cli\u003eNeighbor platforms: 40\/48\/50 HP family variants share many components with 43HP models; verify by model number before ordering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"platforms\" style=\"max-width:1100px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003ch2\u003eEngine Overview\u003c\/h2\u003e\n  \u003ch3\u003eMidrange 2‑Stroke Platform\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\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=\"border-bottom:1px solid #eee;padding:8px;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eCarbureted 2‑Stroke outboard in the 40–50 HP family; typically lightweight, with electric and\/or manual start options and 20\" or 25\" shafts.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eJohnson 43HP variants and related 40\/48\/50HP 2‑Stroke models (including select “SPL” and commercial versions).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eSimple to service, strong hole‑shot, and excellent power‑to‑weight for small to midsize boats.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eMany wear items interchange across the 40–50HP range. Confirm with your exact model\/serial. If equipped with VRO, inspect oil delivery lines and pump routinely.\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=\"max-width:1100px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for 2‑Stroke Johnson midrange motors. Always follow the procedures and schedules in your official service manual.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\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=\"border-bottom:1px solid #eee;padding:8px;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eCheck for water intrusion (milky oil) and metal on the drain plug magnet.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude\"\u003eJohnson\/Evinrude Main Collection\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e100 hrs or each season\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eVerify heat range and gap for your model; replace if fouled or worn.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eFuel filter (inline)\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e100 hrs or as needed\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eReplace sooner if debris or ethanol‑related contamination is present.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eWater pump impeller\/kit\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e2–3 seasons or ~200 hrs\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eEssential for cooling; replace sooner if tell‑tale is weak or uneven.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-water-pump-repair-kits\"\u003eJohnson\/Evinrude Water Pump Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eAnodes (corrosion protection)\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eInspect 50 hrs; replace when 50% depleted\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eChoose zinc (salt), aluminum (brackish), or magnesium (fresh) as appropriate.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-anodes\"\u003eJohnson\/Evinrude Anodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eOil delivery (2‑Stroke)\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eSeasonally\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003ePremix engines typically use 50:1. For VRO systems, inspect oil lines, filter, and pump function.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude\"\u003eJohnson\/Evinrude Main Collection\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eLower unit seals (as needed)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eWhen water is found in gear oil or after case work\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eUse a complete seal kit after prop‑shaft or driveshaft seal failures or during rebuilds.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-lower-unit-seal-kits\"\u003eJohnson\/Evinrude Lower Unit Seal Kits\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=\"max-width:1100px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service — \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-service-maintenance-kits\"\u003eJohnson\/Evinrude Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System — \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-water-pump-repair-kits\"\u003eWater Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System — \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical — \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase \u0026amp; Seals — \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-lower-unit-seal-kits\"\u003eLower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropulsion — \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-propellers\"\u003eJohnson\/Evinrude Propellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection — \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-anodes\"\u003eJohnson\/Evinrude Anodes\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"max-width:1100px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\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=\"border-bottom:1px solid #eee;padding:8px;\"\u003eWeak tell‑tale or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eInspect intake screens for debris; confirm strong water stream; verify impeller and thermostat condition.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eWater pump kit, thermostat, intake screen\/anode fasteners\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eCheck plug gap\/condition; ensure fresh fuel; confirm primer\/choke operation and no air leaks in fuel line.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eSpark plugs, inline fuel filter, primer bulb, fuel pump diaphragm\/kit, fuel hoses\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eInspect prop for damage or wrong pitch; verify compression; clean carburetors; check for restricted fuel flow.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003ePropeller, carburetor rebuild kit, fuel filter, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eExcessive smoke (2‑Stroke)\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eConfirm correct premix ratio (typically 50:1) or VRO calibration; verify thermostat is closing and engine reaches temp.\u003c\/td\u003e\n        \u003ctd style=\"border-bottom:1px solid #eee;padding:8px;\"\u003eOil injection hoses\/pump parts, thermostat, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eGearcase noise or metal in oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eCheck oil level\/condition; inspect for fishing line at prop shaft; assess bearing free play.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eLower unit seal kit, prop hub hardware, gear lube\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=\"max-width:1100px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre 43HP parts interchangeable with 40\/48\/50HP Johnson models?\u003c\/summary\u003e\n    \u003cp\u003eMany routine items (impeller kits, anodes, filters, and some ignition components) are shared across the 40–50HP family. Always verify using your exact model and serial to avoid mismatches.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the water pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eAs a preventive measure, replace the impeller every 2–3 seasons or around 200 hours. Replace sooner if the tell‑tale weakens, you run in sandy\/silty water, or after an overheat event.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change the gear oil?\u003c\/summary\u003e\n    \u003cp\u003eAt least once per season or every 100 hours. Inspect any time the prop hits debris or if you notice milky oil (a sign of water intrusion).\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the full model number, serial number, shaft length (S\/L\/X), approximate year, and clear photos of the nameplate and the part you are replacing.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"max-width:1100px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003cp\u003eReady to find parts for your Johnson 43HP 2‑Stroke? Browse the main Johnson\/Evinrude collection by horsepower, year, and model, then use Filter \u0026amp; Sort to narrow your results.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude\" style=\"display:inline-block;margin:8px 0 4px 0;padding:10px 14px;background:#0b6efd;color:#fff;text-decoration:none;border-radius:4px;\"\u003eShop Johnson\/Evinrude Parts\u003c\/a\u003e\n  \u003cp style=\"font-size:0.95em;color:#444;\"\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":[],"url":"https:\/\/seasierra.com\/collections\/johnson-43hp-2-stroke-outboard-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}