Help Apollo 125cc

[Katiebug0530]

What would cause a 4strole to smoke blue when just starting it or reving it and puddle black oil in the exhaust

 

[Rich Rohrich]

What would cause a 4strole to smoke blue when just starting it or reving it and puddle black oil in the exhaust

Worn piston rings, worn valve seals, worn valve guides, or a blocked crankcase vent are common causes.