Hawk 250 Engine is Bogging

[Ariel Red Hunter]

Originally Posted by Dallas

I think this might be a problem that's accuring. The liquid in the air box smells like gas but feels like oil. From what I read excess fuel will sometimes leak past the piston and into the crank case mixing with oil. Then build up and leak out.

Maybe. But the smell of gas in the airbox could be from engine panting. Panting is caused by the intake valve closing, causing the in-rushing gases to pile up against the valve until there is enough energy to reflect the gas back out the carburetor, onto the aircleaner medium. Especially a dry paper element. If oil mist is coming up the crankcase breather line, it will coat the element slightly, and capture the gas panting out of the engine. Then it smells like raw gas in there. Put in a PCV unit, and exhaust the vent line elsewhere.

[david3921]

Originally Posted by Weldangrind

I agree. A little looser is better. To confirm, it should be 0.05mm intake and 0.08mm exhaust.


I'm going to edit this info and suggest 0.08mm for both intake and exhaust.

Sorry, too many zeros. Thanks for the correction, Weld.

[Vk321530]

Curious if this issue has ever been resolved? My bike is doing the same thing