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Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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I have a 1990 40 outboard jet drive. Its accelerating. Its

Customer Question

I have a 1990 Johnson 40 outboard jet drive. Its accelerating. Its starts good idle, revs up outside of water.But when i put in water only go 30% of its speed . I did clean the carburetor took it a part high flow a low. Replace the primer solenoid, spark plugs , fuel filter, gas tank and new line,took the jet drive a part its clean. Can you help me?
Submitted: 6 months ago.
Category: Boat
Expert:  Jason replied 6 months ago.

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

What is the story behind this engine? When was the last time it made full power under a load? Have you ever seen it make full power under a load personally?

How old is the fuel?

Has compression and spark output been checked yet?

You wrote that you cleaned the carb, is that something you are qualified to do, or did you just take it apart hoping to take a stab at it?

Customer: replied 6 months ago.
I been using the boat for 4 years and pick up fresh 93 today
Expert:  Jason replied 6 months ago.

How about the rest of it?

Expert:  Jason replied 6 months ago.

Has compression and spark output been checked yet?

You wrote that you cleaned the carb, is that something you are qualified to do, or did you just take it apart hoping to take a stab at it?

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