High speed miss or pop on my 1999 Evenrude 15 hp 4-stroke.

Threadfin

Recruit
Joined
Jan 29, 2004
Messages
3
An up date on my article back on Oct. I had to replace the ignition module in Oct. The first time out while the engine was still cold I had no problem getting WOT. After about 15 minutes, at WOT or after trolling for a period of time, and the engine has warmed up, I start getting a pop or miss at WOT. This does not happen in the tank or tied up at the dock, in gear and at WOT. Only while running on the lake. I get almost full RPM's and lose about 5 MPH. Since this only started after I replaced the module, I replaced the module again with another OMC updated part. I still have the problem. The engine has about 800 hrs on it, and I have not had the valves adjusted(was told not to worry untill 1000 hrs.) I can correct the problem by backing off the throttle just a little. Please help.
 

clanton

Rear Admiral
Joined
Jul 9, 2001
Messages
4,876
Re: High speed miss or pop on my 1999 Evenrude 15 hp 4-stroke.

The valves may be ok, but how do you know without checking the clearence?
 
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