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checked for air leaks around intake and carburetor,found no leaks can visually determine that grooves in crank and flywheel are perfectly aligned. Rechecked and reset valve adjustment tried a different carb, seems to be running much better. Thanks for all the response and replies

Thanks for the reply however as stated this is a model 311 777 one cylinder engine I did check flywheel shear pin and it is in good shape

Model 311777 ...Starts easley, idles right,runs great up to about 70 to 80% of max rpm then begins to misfire sometime backfiring thru muffler ..new carburetor,new spark plug,, valves adjusted to .004 and .006... Any suggestions??