5500 RPM, No Problems?

[gregmsr]

1989 125HP
If I can get 5500 RPM WOT anytime I want, I assume I have no engine problems correct?
The reason I ask is my bottom plug is always a little cleaner than the other 3. If #4 cylinder is not firing strongly, I wouldn't be able to get the 5500 RPM (seems to me).

Time to start thinking about the summer days and nights on SML VA!

 

[NYBo]

Re: 5500 RPM, No Problems?

Not necessarily, if the boat is way under-propped for some reason. What boat and what prop do you have, and what is your speed at WOT?

 

[Frank Acampora]

Re: 5500 RPM, No Problems?

Engines running too lean run really great until detonation melts the piston!

There usually will be a small variation in deposits on the plugs. BUT: If your bottom plug runs much cleaner than the top in that set of cylinders, if it were my engine, I would richen up the idle needle about 1/8 turn and see what happens.

 

[jerryjerry05]

Re: 5500 RPM, No Problems?

Check with a flashlight in the cylinder and see if the piston is clean like the plug.Do a compression test there might be a head gasket leaking water into the cylinder.J