ORIGINAL: Dr Nitro
You got that 100% backward. IF its blubbering, then it has excess fuel in there and it is too rich which is just as bad for the engine as too little fuel where it fades away and sags at full throttle due to being lean.
Please try to refrain from spreading misinformation.
This is a case of misunderstanding of semantics.
When I say blubbering, I am referring to the stuttering the engine makes from being too lean.
I refer to the engine noises from being too rich as stumbling.
ORIGINAL: Dr Nitro
If too lean, they do not stall due to friction, they fade, sag or stall out due to loss of compresson because the sleeve expanded past the point where the piston expanded to.
When the engine is not fully broken in, the piston and sleeve DO cause friction since the sleeve and piston have not worn to the proper operating diameters yet. Even at operating temps, an engine not fully broken in will still not have the correct expandeded diameters. That's why we break in our nitro engines.
What you are saying is true if the engine has already been fully broken in and is running at temps that are too hot.