tomkatesam
Cadet
- Joined
- Apr 19, 2004
- Messages
- 17
I have a 75 mercury 850 with great compression, 150 psi on each, spark, and the fuel pump works, but I cannot get the engine to idle in gear for more than 5 minutes without having the RPMS at 1000 or not stall when going into gear. I have cleaned and rebuilt the carbs twice. I was trying to tune the engine again last weekend and noticed that when I turn the idle mixture screw out counter clockwise to richen the mixture on the top carb the engine never stumbles. If I turn the screw clockwise it will stuble after the rpms increase. The bottom carbs stumbles when the screw is turned both ways. Can anyone give some advice; this engine is driving me nuts.