Jet engine bogs down

trvman

Recruit
Joined
Sep 15, 2007
Messages
3
Have a Mercury jet boat engine 120hp.

Bogs down when it gets around 40, looses power but doesn't stall out.

Had carbs cleaned, pulled gas tank and cleaned that, had fuel filter and fuel lines cleaned also. Has new plugs and compression is fine on all 4 cylinders.

Can this be a throttle problem or carb problem?

It now idles kind of fast.

Is it flooding at faster speeds or not getting enough fuel?

Open for suggestions.
 

sschefer

Rear Admiral
Joined
Nov 13, 2008
Messages
4,530
Re: Jet engine bogs down

Have a Mercury jet boat engine 120hp.

Bogs down when it gets around 40, looses power but doesn't stall out.

Had carbs cleaned, pulled gas tank and cleaned that, had fuel filter and fuel lines cleaned also. Has new plugs and compression is fine on all 4 cylinders.

Can this be a throttle problem or carb problem?

It now idles kind of fast.

Is it flooding at faster speeds or not getting enough fuel?

Open for suggestions.

Could be too much WOT timing. You should perform the link/synch procedures for your engine as per the Merc Service Manual and verify that your timing pointer is set correctly.
 
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