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Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16102
Experience:  Degree in Marine Technology. Gas and diesel marine mechanic.
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I have a four stroke 2004 25hp mercury. It started to lose

Customer Question

I have a four stroke 2004 25hp mercury. It started to lose high RPM. I thought I was getting water in the fuel system.I drained the carb, the tank and added a fuel filter/separator. Ran great for a few days. Now it runs on 1 cylinder. Checked spark on both cylinders. They seem to have weak but even spark. Next I will look at rocker arms.
What are your thoughts?
Submitted: 1 year ago.
Category: Boat
Expert:  Jason replied 1 year ago.

Hello my name is ***** ***** am I speaking with?

All Mercurys are cataloged by serial number, can I start by getting that number.

Customer: replied 1 year ago.
Thanks for your response
Problem is solved.
Broken rocker arm.
Expert:  Jason replied 1 year ago.

That's an odd problem to have on this engine, usually that doesn't happen. Glad to hear you got it though.

Happy boating!