just bought a thumpstar which has a yx 140 engine. the only oil i have is 20w60 aircraft piston oil which has lycoming added as an anti scuffing agent. anybody know if this would be ok?
I wouldnt use it, additives tend to kill the clutches in these engines. Grab a motorcycle specific oil, i use castrol gp1 personally, but everyone has a prefered brand lol.