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Is the engine a two-cycle or four-cycle? A two-cycle engine requires oil to be mixed with the fuel to lubricate the piston/rings/crankshaft/rod top and bottom bearing/main bearings.
A four-cycle doesn't require it. (A four cycle has valves in the head)
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Look at the shift linkages. If they are loose and out of alignment it will sometimes cause that condition. The linkages where the go into the transmission is a common spot where the splines will get slop in them.