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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Suzanne C profile picture
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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Isaac Ripley profile picture
Isaac Ripley
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Had a great experience with Travis at Custom Marine Services. Professional, easy to work with, and went above and beyond to make sure everything was taken care of. Highly recommend them for any boat service!
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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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ROGER THOMPSON profile picture
ROGER THOMPSON
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My Yamaha outboard was giving me an alarm when trolling, so I called Travis. He told me what he thought the problem might be, gave me a ballpark and I dropped it off the next day. He called me the following day to tell me it was ready for pickup, emailed me the invoice, (which was very close to the ballpark) and he that he was able to accommodate my schedule by letting me do so on a Saturday. Great communication! Very Friendly! Thank you Travis!
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Atreyu Buscay
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Great place. Takes good care of customers boats.
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James Welton profile picture
James Welton
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I was referred to Travis at Custom Marine Services by a company that I used for years, who no longer works on Mercruiser engines. From the moment I spoke with Travis, I could tell he was a master technician. He understood exactly what I was looking to have done to my boat. Meeting him at his shop, I was completely impressed by how clean and organized it was! He went over everything that we discussed and said he would let me know what they find once they dig in. It wasn’t a day and he contacted me with the items that would need to be done. Then the work began. His communication throughout was terrific. Thoughtful and thorough, taking the time to explain it so I could understand. They completed the work quickly and I picked it up in under a week, which seemed very quick to me! While there for pickup, he went over all of the work done and again I was impressed with his attention to details. There are no shortcuts taken here! If you’re looking for an honest, reliable and truly great person to work on your boat, then look no further! I will be recommending him to everyone I know without hesitation.
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Duncan Milloy profile picture
Duncan Milloy
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I was at my wit's end trying to find a qualified marine mechanic to re-power my Bayliner 2859. Travis O'Neill was recommended to me. He answered the phone on the first ring and from that moment on he provided outstanding service and got me floating again. He visited my boat at the Port of Edmonds and discussed options with me. We decided to have the exising MerCruiser 7.4L replaced with a new Quicksilver 6.2L engine along with a new transom assembly. Travis hauled the boat to his shop in Stanwood and performed the work there. He did an excellent job. It feels like I have a brand new boat. Travis combines his technical competence with a friendly, can-do attitude to get the job done. I can recommend him without hesitation.
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