I wanna upgrade my motor to a bigger bore, 440,416,426. Tell me abourt them, and i heard with the 440s they over heat quick, if that is so how sould i change the cooling system?

 

Since it's an air cooled engine, all you can really do to modify the way the engine cools is add a bigger oil tank. 4 stroke tech has an extra oil cooler, but I've never used or seen one. My advice has always been to start small and leave room to grow. If you start with a 416 and want more power later it's there. If you jump right into a 440 and something happens you're getting a new cylinder at least.