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Jeremy R.
Jeremy R., MarineTechnician
Category: Boat
Satisfied Customers: 9019
Experience:  Multiple factory certifications 20+ years of experience.
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I have a 1999 Gp800 just rebuilt, the spark is good but the

Customer Question

I have a 1999 Gp800 just rebuilt, the spark is good but the engine still wont start. I have tried mixing oil and fuel into the cylinders to start, but no luck. Any help would be great.
Submitted: 1 year ago.
Category: Boat
Expert:  Jeremy R. replied 1 year ago.
Hi, 0My name is***** you for letting me try and assist you with your problem.
I know you said you just rebuilt it but you need to set up your basics.
Check compression, check spark.
You obviously have fuel.

What do the plugs look like?
Have you tried a new set and held the throttle wide open?

Let me know what you find.
Customer: replied 1 year ago.

Compression is good, spark is good, plugs have oil but not fuel. Yes have tried two sets of plugs and with throttle wide open.

Expert:  Jeremy R. replied 1 year ago.
Are you sure the reeds are sealing.
that will cause this problem
Customer: replied 1 year ago.

Havent tried that but how about a bad power valve?

Expert:  Jeremy R. replied 1 year ago.
It will make it hard to start but they don't go bad. They just can be open when they need to be closed.
Pop off a cover and make sure they're down all the way.
Customer: replied 1 year ago.

I will check that first. anything else I should look for while im disassembling the exhaust?

Expert:  Jeremy R. replied 1 year ago.
Nah there's nothing else functional to it as long as the gaskets are all inplace keeping water out where it's not supposed to be.

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