Hi
I have a problem with my 91 magnum 4 stroke.
Engine was run very good for last couple years. Last time
I did a mistake. I runned engine lean for about 10-15 min.
Engine was run, he was very hot and noise and was no power,
plane was fly slow. After I adjust a needle valve, engine was run
in normal temperate with no power, sounds differently.
After disassembling, i saw bad bearings. Now, I replaced bearings and connecting rod. I put engine together, and I try
to run, Engine started easy, but in hight RPM no power at all.
( looks like 20 size engine) Now , I dont know , I did some
mistake in assembling (timing), or i have to replace head gasket?
( because seems i have low compression on it) . If someone have experience on four stroke engines (assembling) , please
Let me know what to do.



Thanks