RE: Poulan 46cc help/parts
look up (poco242) herre on rcu.he sells these engines converted for our airplanes.he might have some extra flywheels.make sure the edges on your crankshaft where the keyway fits are sharp and clean.also make sure the fywheel is seated all the way and the nut is tight.i would try some loctite brand bearing retainer with a new flywheel and torqe the nut down.