Tohatsu 70HP 2-Stroke Outboard Marine Engine Parts

(15 products)

This page covers Tohatsu 2-Stroke 70HP outboard engines and helps you quickly find compatible parts and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Tohatsu collection anytime. Scroll to the bottom of this page to start browsing parts for this engine, and remember you can use the Filter & Sort controls on the collection page to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 70HP Model

Find the nameplate/serial plate on the transom clamp bracket or swivel bracket. It lists the exact model designation and serial number.
Read the model code: the base model (e.g., M70C) is often followed by suffixes for start type, trim/tilt, and shaft length (e.g., E for electric start, PT for power trim & tilt; S/L/XL for 15/20/252 shafts).
Confirm whether your engine is oil-injected (auto-mixing) or premix only. Most 70HP 2-strokes of this era use an oil pump (auto-mix) system.
Check the ignition variant by serial (some models use earlier vs. later magneto/C.D. unit versions). Matching the ignition type helps ensure correct electrical parts.

Engine/Platform Overview

Tohatsu 70HP 2-Stroke

Feature	Description
Configuration	Inline-3, carbureted 2-stroke, oil-injection (auto-mixing) on most models.
Common Models	Examples include the M70C in various trims (manual/electric start, tiller vs. remote, power trim & tilt, multiple shaft lengths). Early 2000s production is common for this platform.
Advantages	Light weight for its class, strong mid-range torque, straightforward carburetor service.
Notes	Ignition parts may differ by serial (older vs. newer magneto/C.D. unit). Verify oil pump (auto-mix) service status, and match water pump/gearcase parts by shaft length and gearcase variant.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow your official service manual and adjust based on hours, environment, and storage practices.

Item	Interval*	Remarks	Parts Link
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water or metal. Replace seals if contamination is found.	Tohatsu Lower Unit Seal Kits
Spark plugs	Inspect each 50 hours; replace ~100 hours/season	Check heat range and gap; replace if fouled or worn.	Spark plug
Inline fuel filter	Every 100 hours or annually	Replace more often with ethanol or contaminated fuel.	Fuel Filters
Water pump impeller/kit	Every 2 seasons or 200 hours (sooner in sandy/silty water)	Restore cooling performance and prevent overheat.	Tohatsu Water Pump Repair Kits
Anodes (zincs)	Inspect every 50 hours; replace when ~50% depleted	Use alloy suitable for your water (fresh, brackish, or salt).	Anodes
Oil injection (auto-mix) system check	Annually	Inspect pump operation, lines, and screen/filter; bleed after service. Use correct 2-stroke outboard oil.	Tohatsu Outboard Parts
Fuel pump diaphragm	200–300 hours, or if surging/starvation	Aged diaphragms cause lean condition and power loss.	Fuel Pumps
Thermostat inspection	Every 2 seasons	Replace if stuck or corroded; poor warm-up can increase smoke/fouling.	Tohatsu Outboard Parts

Frequently Used Parts Categories

Routine Service & Model-Specific Items — Tohatsu Outboard Parts
Cooling System — Tohatsu Water Pump Repair Kits
Fuel System — Fuel Filters and Fuel Pumps
Ignition / Electrical — Electrical Items and Starters
Corrosion Protection — Anodes
Lower Unit / Drivetrain — Tohatsu Lower Unit Seal Kits
Propellers & Hardware — Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell-tale or overheat alarm	Inspect intake screens for blockage; verify water pump impeller condition; check thermostat.	Water pump kit, thermostat, gaskets, intake screen
Poor acceleration or power loss	Check for fouled plugs, clogged fuel filter, stale fuel, prop damage, or reed/carb issues.	Spark plugs, fuel filter, carburetor kit, propeller
Hard starting / rough idle	Verify choke/enrichment operation; inspect plugs and fuel quality; confirm battery and starter performance.	Spark plugs, fuel filter, starter, fuel hoses
Excessive smoke (2-stroke)	Check oil pump setting and bleed; confirm correct oil type; thermostat not stuck open; avoid overly rich premix.	Oil injection service parts, thermostat, spark plugs
Gearcase noise or metal in gear oil	Check oil level/condition; look for water intrusion; inspect propshaft for fishing line damage.	Lower unit seal kit, shims/bearings (as needed), propeller hardware

FAQs

Are parts interchangeable between different years or ignition variants?

Some items interchange across years, but ignition and electrical parts may differ (older vs. newer magneto/C.D. unit). Always match by model/serial and trim options (start type, PTT, shaft length).

When should I replace the impeller?

As a rule of thumb, replace the impeller every 2 seasons or ~200 hours, and sooner if you run in sandy/silty water or notice a weak tell-tale or rising temperatures.

How often should I change lower unit gear oil?

Change gear oil every 100 hours or annually. Inspect for milkiness (water) or metal. If contaminated, pressure-test the gearcase and renew seals before returning to service.

What information do you need to confirm part compatibility?

Please provide the exact model designation, serial number, shaft length, control type (tiller/remote), and whether it has power trim & tilt. Photos of the nameplate and the part you are replacing are also helpful.

Ready to find parts by horsepower, year, and model? Browse the main Tohatsu collection to locate components that fit your 70HP 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.