Engine Services2026-09-01T19:06:42-07:00
Outboard motor service on a boat

Engine Services

Marine Engine Repair & Boat Engine Service in Western Washington

Custom Marine Services provides inboard and outboard engine service, diagnostics, repairs, maintenance, rebuilds, and repower support for recreational boats, fishing boats, trailer boats, yachts, and other vessels throughout the Puget Sound region.

Reliable Engine Service for the Way You Use Your Boat

From routine maintenance and diagnostics to inboard repairs, outboard service, rebuilds, and repower support, Custom Marine Services helps keep your boat’s engine dependable, efficient, and ready for the water.

Technician performing outboard motor service on a boat

Outboard Engine Service & Repair

● Outboard maintenance

● Outboard motor diagnostics

● Outboard repair

● Outboard tune-ups

● Oil and filter service

● Lower unit service

● Cooling system checks

● Fuel system service

● Starting and charging system checks

● Performance issue troubleshooting

MerCruiser inboard engine in a boat engine compartment

Inboard & Sterndrive Engine Service

● Inboard engine maintenance

● Sterndrive service

● MerCruiser service

● Volvo Penta service

● Engine diagnostics

● Cooling system service

● Belt, hose, and fluid checks

● Ignition and fuel system troubleshooting

● Drive system inspection

● Pre-season and post-season service

Technician performing outboard engine diagnostics on a boat

Diagnostics, Rebuilds & Repower Support

● Marine engine diagnostics

● Hard-starting issue troubleshooting

● Loss of power diagnosis

● Overheating diagnosis

● Engine performance checks

● Full engine rebuilds

● Repower planning and support

● Pre-purchase mechanical inspections

● Maintenance recommendations

● Service planning for older boats

mercury authorized dealer logo

Looking for expert service and support for your Mercury-powered boat?

Looking for expert service and support for your Mercury-powered boat?

As a Mercury Authorized Dealer, Custom Marine Services provides expert service, diagnostics, support, and repower solutions for Mercury and MerCruiser-powered boats.

repower engine project at Custom Marine Services

Questions About Boat Engine Service?

Get quick answers about marine engine service, diagnostics, repairs, maintenance, rebuilds, and scheduling service with Custom Marine Services.

What engine services do you offer?2026-05-06T16:52:54-07:00

Custom Marine Services provides inboard and outboard engine service for boat owners throughout Western Washington. Services can include diagnostics, maintenance, repairs, tune-ups, rebuilds, repower support, and routine service planning.

Do you service outboard motors?2026-05-06T16:54:38-07:00

Yes. Custom Marine Services services outboard motors for recreational boats, fishing boats, trailer boats, and other vessels. Common outboard services include diagnostics, maintenance, tune-ups, cooling system checks, fuel system service, and repair work.

Do you work on inboard and sterndrive engines?2026-05-06T16:56:35-07:00

Yes. Custom Marine Services provides inboard and sterndrive engine service, including maintenance, diagnostics, repair work, and related system checks. This can include service for MerCruiser and Volvo Penta engines where applicable.

What are signs my boat engine needs service?2026-05-06T16:58:24-07:00

Common signs include hard starting, rough idle, loss of power, overheating, unusual vibration, warning alarms, fuel smell, poor throttle response, or a change in how the boat performs. It is best to schedule service early before a small issue becomes a larger repair.

Do you provide marine engine diagnostics?2026-05-06T17:00:40-07:00

Yes. Marine engine diagnostics can help identify problems with starting, charging, fuel delivery, cooling, ignition, sensors, and overall engine performance. Good diagnostics help avoid guessing and make repair planning more straightforward.

Can you help with a boat repower?2026-05-06T17:02:40-07:00

Yes. Custom Marine Services can help with repower planning and support. A repower may be worth considering when an engine is unreliable, outdated, underpowered, inefficient, or no longer practical to repair.

How do I schedule engine service?2026-05-06T17:04:21-07:00

You can schedule boat engine service by calling Custom Marine Services or filling out the service request form. Include your boat type, engine brand, engine model if available, symptoms you are noticing, and whether the issue is urgent.

Explore Our Other Services

Marine electronics display at a boat helm

Electronics Services

Marine electronics installation, wiring, electrical service, and system upgrades for better performance, safety, and reliability on the water.

Person inspecting a boat propeller during routine boat maintenance

Maintenance Services

Routine boat maintenance, winterization, shrink wrapping, and seasonal service to protect your investment and keep your boat ready.

Boat Upgrades & Other Services

Custom installations, rigging, bottom painting, gel coat repair, and other marine upgrades tailored to how you use your boat.

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Hermann Fernandes Pais profile picture
Hermann Fernandes Pais
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Very impressed with the quality and detail of the service done by Travis and Steve. Halfway through the boat already looks 80% better from the day of purchase. Engine removal, cleanup, service done impeccably. Accurate estimates and great communication. The shop itself is one of the cleanest I’ve ever seen. They come to your boat or if it’s trailerable you bring it to them.
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Eric Emme profile picture
Eric Emme
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Travis was awesome. We had several complex warranty issues on our new boat - and Custom stepped in to help solve. I plan to use them again in the future, and would highly recommend
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Andrew Funk profile picture
Andrew Funk
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My wife and I have been boaters for just over a year now. Our boat, a 2002 Bayliner Cierra Classic, had a rebuilt motor when we bought the thing, but we were a little disappointed to find it needed some work. Several gaskets leaked oil. Considering safety and peace of mind, we started looking for a marine mechanic to fix our gasket issues. We really wanted to feel safe out there in the Puget Sound waters and needed a motor we could rely on. With that in mind, we were grateful to find Travis at Custom Marine Services. Prior to meeting Travis, our experience with other marine mechanics was less than satisfactory. I am pleased to share a different outcome here. After further inspection and diagnosis of our old motor, we decided to accept the advice of Custom Marine Services to install a new motor. A motor we could count on. Our boat is nearly 25 years old and needed more than just a new motor, including some plumbing and wiring. Custom Marine Services work was timely and knowledgeable. Travis and his team even worked on the weekend, so we could make it back on the water for the early summer. Overall, we are grateful to have found a marine mechanic with the technical expertise and professionalism we needed to get us back on the water with a reliable motor. Our new MerCruiser inboard engine has breathed new life into our boat and we feel safer and more confident. We would recommend Custom Marine Services to anyone looking for a marine mechanic they can count on.
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THOMAS ADAMS
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Good guys.
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Daryl Gray profile picture
Daryl Gray
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Excellent work, Travis and his marine mechanic are top notch
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Suzanne C
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We launch out of Edmonds, and this June, we found a new marine engine service team in Custom Marine Services. It was really easy to contact Travis (in Stanwood) and get an estimate and quickly schedule service so we could get out and get our fishing and crabbing on! Our Yamaha engines are running like champs.
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Tim Niebruegge profile picture
Tim Niebruegge
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Travis and staff at Custom Marine were very easy to work and communicate with. I took my Bayliner 185 in to check out some engine noise and they were able to help diagnose and get a plan in place to fix. They took it a step further and were able to take care of a couple other issues that were going to start to cause some headache all in the same servicing. I will definitely be bringing my boat back for other work in the future and can confidently recommend others doing the same.
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randy allen
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Travis was really awesome. Got my motor running within a week little 9.9 Yamaha I would definitely recommend anybody to him.
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Kevin Stephens profile picture
Kevin Stephens
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Awesome service. Honest and professional. I will be having all my engine service and repair work done by them.
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Sphere talk With Michelle and Shawn
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There’s no I trust with my boat! Travis always helps me winterize and winterize my boat. Check the engine and take care of any repairs needed and always keeps it running smoothly. I highly recommend!
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