Yamaha 55HP 2-Stroke Outboard Marine Engine Parts

(25 products)

This page is dedicated to Yamaha 55HP 2-Stroke outboard engines. Use it to find compatible parts and practical service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main Yamaha collection. Scroll to the bottom of the page to start browsing parts for this engine, and on the collection page use the Filter & Sort controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 55HP Model

Nameplate location: Check the transom bracket or swivel bracket for the model label and serial number; many Yamaha plates are on the port side of the bracket.
Reading the model code: For 2-stroke C‑series codes, letters typically indicate features such as E (electric start), L (long shaft), R (remote control), and T (power trim/tilt). The trailing letters often hint at year/region revisions.
Carbureted 2‑Stroke specifics: These engines use reed‑valve induction and mechanical carburetors. Models may be oil‑injected or premix depending on variant and year—confirm on the cowling decal or in the manual.
Prop shaft length & control type: Verify shaft length (short/long) and whether your engine uses tiller or remote controls, as this affects control cables, harnesses, and mounting hardware.

Engine Overview

Yamaha 55HP 2‑Stroke (C55‑series examples)

Feature	Description
Configuration	Carbureted 2‑stroke with reed‑valve induction; manual or oil‑injection depending on model; electric‑start and power trim/tilt available on certain variants.
Common Models	Examples include C55ELRT and C55TR (mid‑1990s C55 family). Confirm exact suffix for feature/fitment differences.
Advantages	Light weight, simple maintenance, strong low‑to‑midrange punch for small craft and workboats.
Notes	Cooling, ignition, and fuel parts are often shared within the C55 series, but verify by model code and shaft/control configuration before ordering.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the service schedule and specifications in your official Yamaha service manual.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion/metal on magnet; replace drain/fill gaskets.	Yamaha Outboard Parts
Spark plugs	Inspect every 50 hours; replace ~100 hours/season	Gap to spec; replace sooner if fouled or misfire occurs.	Spark Plugs
Inline fuel filter / water separator	Inspect every 50 hours; replace 100 hours/season	Check for debris/water; replace primer bulb/hose if cracked.	Fuel Filters
Water pump impeller / repair kit	Every 2–3 seasons or 200 hours	Replace sooner if weak tell‑tale, overheat alarm, or sand/silt usage.	Yamaha Water Pump Repair Kits
Anodes (internal & external)	Inspect monthly; replace when ~50% consumed	Use the correct alloy for your water (fresh/brackish/salt).	Yamaha Anodes
Propeller inspection	Every trip; remove annually	Check for dings and fishing line around shaft; grease splines when reinstalling.	Yamaha Propellers
Lower unit seals (if leak found)	As needed	Pressure/vacuum test after seal replacement; refill with fresh gear oil.	Yamaha Lower Unit Seal Kits
2‑Stroke oiling (oil injection or premix)	Check every service	Inspect oil tank/lines and strainer; if premix, use quality TC‑W3 oil at the specified ratio (commonly 50:1 unless otherwise stated).	Yamaha Service & Maintenance Kits

Frequently Used Parts Categories

Routine Service Kits — Yamaha Service & Maintenance Kits
Cooling System — Yamaha Water Pump Repair Kits
Gearcase & Seals — Yamaha Lower Unit Seal Kits
Fuel System — Fuel Filters
Ignition / Electrical — Electrical Items
Propellers — Yamaha Propellers
Gaskets & Sealing — Yamaha Gaskets

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale / overheat alarm	Inspect intake screen, thermostat, and water pump impeller condition.	Water pump kit, impeller, thermostat, intake screen.
Hard starting / rough idle	Verify primer bulb, check for stale fuel, clean/adjust carburetors, and inspect spark plugs.	Spark plugs, fuel filter, primer bulb/hose, carburetor kit.
Poor acceleration / power loss	Check propeller condition/pitch, compression, and ignition output.	Propeller, fuel pump, ignition components, reed gaskets.
Excessive smoke (2‑Stroke)	Confirm correct oil ratio and that oil‑injection system is not over‑oiling; ensure carbs are not flooding.	Fuel needles/seats, float kits, oil‑injection lines/filters.
Gearcase noise / metal in oil	Drain and inspect gear oil; check prop shaft for fishing line; perform pressure/vac test.	Lower unit seal kit, bearings, thrust washers, shims.

FAQs

Are parts interchangeable between different years or platforms?

Many C55‑series components cross over among nearby years, but ignition, gearcase, and bracket parts can vary by suffix and production run. Always confirm using the full model code and serial number.

When should the impeller be replaced?

As a preventative measure, replace the impeller every 2–3 seasons (or ~200 hours). Engines used in sandy or silty water may need more frequent service, or a complete water pump kit including wear plate and seals.

How often should gear oil be changed?

Change at least annually or every 100 hours. If the oil appears milky or metallic, service the lower unit immediately and pressure/vacuum test to confirm seal integrity.

What information do I need to confirm part compatibility?

Provide the full model code (including suffix letters), serial number, shaft length, and control type (tiller or remote). A clear photo of the nameplate helps verify exact fit.

Ready to find the right parts? Browse the main Yamaha collection and filter by horsepower, year, and model to locate compatible components for your 55HP 2‑Stroke.

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If you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.