Indmar 350HP 4-Stroke Marine Engine Parts

(6 products)

This page is dedicated to Indmar 4‑Stroke 350 HP marine engines. Use it to find compatible parts and service information, including maintenance tips, common replacement components, and troubleshooting guidance. You can also browse our main engine parts collections. Scroll to the bottom of the page to start browsing parts for this engine. On the collection pages, use the Filter & Sort controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 350 HP Model

Locate the engine identification plate or decal on the intake manifold, flame arrestor, or valve cover; some boats also have a tag on the transmission or bell housing.
Record the full engine serial/model code and any suffixes; these can indicate fuel system type (carbureted vs EFI/MPI), emissions family, and build year.
Fuel system clues: a mechanical carburetor with choke linkage typically indicates earlier builds; a fuel rail and injectors indicate EFI/MPI platforms.
Note accessories that affect parts choices, such as raw‑water pump style, alternator output, and belt configuration (V‑belt vs serpentine).

Engine Platform Overview

Indmar 350 HP packages commonly utilize GM‑based V8 four‑stroke platforms found in many inboard ski and wake boats. Variants exist with carbureted and EFI/MPI fuel systems, which can change intake, fuel, and ignition components.

Carbureted V8 Platform (commonly pre‑EFI)

Feature	Description
Configuration	GM‑based V8, 4‑stroke, marine carburetor with mechanical fuel pump on many builds.
Common Models	Indmar 350 HP carbureted inboard packages used across various ski/wake boats (exact codes vary by year and OEM).
Advantages	Simple fuel system, straightforward service, widely available tune‑up parts.
Notes	Fuel, ignition, and intake parts differ from EFI/MPI versions; confirm by serial and fuel system type before ordering.

EFI/MPI V8 Platform

Feature	Description
Configuration	GM‑based V8, 4‑stroke, electronic fuel injection (throttle body or multi‑port), electric fuel pump and rail.
Common Models	Indmar 350 HP EFI/MPI inboard packages; intake and sensor sets vary by system generation.
Advantages	Improved cold start, altitude compensation, cleaner emissions, and strong mid‑range torque.
Notes	Intake, injectors, high‑pressure fuel filter, and sensor compatibility depend on the exact EFI generation—verify by serial and ECU label.

Routine Maintenance & Service Parts

Intervals below are general guidelines; always follow the service schedule and specifications in your official engine manual.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Every 100 hours or annually	Use marine‑rated oil and replace the filter at each oil change.	Oil Filters
Fuel filter / water separator	Every 100 hours or each season	Replace more often if fuel quality is questionable.	Fuel Filters
Spark plugs	Inspect at 100 hours; replace as needed	Check gap and look for fouling or uneven wear.	Spark Plug
Raw‑water pump impeller	Every 100 hours or 1–2 seasons	Replace proactively to prevent overheat; inspect housing for wear.	Water Pump Impeller Rebuild Kits
Anodes (zinc/aluminum/magnesium)	Inspect every 50 hours; replace when 50% consumed	Choose alloy to match your water type (salt, brackish, fresh).	Anodes
Accessory belt (serpentine/V‑belt)	Inspect every 100 hours	Check tension, cracking, glazing; replace if worn.	Belt

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Water Pumps
Fuel System: Fuel Filters
Ignition / Electrical: Starters
Exhaust & Induction: Manifolds
Gaskets & Sealing: Gaskets
Corrosion Protection: Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Overheat alarm or hot running	Inspect raw‑water intake for blockage, check impeller condition, verify thermostat operation.	Water pump impeller kit, water pump, hoses, anodes
Poor acceleration or power loss	Check fuel quality, replace fuel/water separator, verify fuel pressure, inspect spark plugs.	Fuel filter, fuel pump, spark plugs
Hard starting or rough idle	Test battery and cables, inspect starter draw, check IAC/idle circuit and vacuum leaks.	Starters, sensors, gaskets
Battery not charging	Check belt condition and tension, verify alternator output, inspect connections for corrosion.	Alternators, belt, anodes

FAQs

Are parts interchangeable between carbureted and EFI/MPI versions?

Many are not. Fuel, intake, ignition, and sensor components often differ between carbureted and EFI/MPI platforms and even across EFI generations. Confirm by engine serial/model and fuel system type before ordering.

When should the raw‑water pump impeller be replaced?

Inspect at least annually and replace every 100 hours or 1–2 seasons. Replace immediately if blades are set, cracked, or missing pieces.

How often should engine oil be changed?

As a general guideline, change oil and the filter every 100 hours or annually, whichever comes first, using marine‑approved oil that meets your engine’s specification.

What information helps confirm part compatibility?

Provide the engine serial/model code, build year, fuel system type (carbureted or EFI/MPI), and photos of the nameplate and the part you are replacing. Accessory details like alternator amperage and belt style also help.

Ready to find parts by horsepower, year, and model? Start by browsing our main maintenance and service collections, then refine with Filter & Sort.

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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.