Engine Trouble No air leak and high idle

[Cisco]

Changed out the carb. The jug ....The carb manifold

Are you sure the carb to intake is sealed (with an O ring)? Check again before tearing the engine apart.

 

[Redbiker]

I sprayed around everything. I have found a leak in the crank seals .. both it seems. Finally got some feedback spraying them when it just warmed up.. changing them out and we will see what happens!

 

[Redbiker]

Weird no oil came out of the seals though... but when I sprayed it with carb cleaner at either seal it stalled the engine

 

[Redbiker]

I think it didn't stall before because I was holding the throttle to keep it running

 

[Street Ryderz]

That's good you found the most common culprit, they are prone to wear and more so if the crank is not very true.

 

[Cisco]

more so if the crank is not very true

Wow, both seals. Could be a wobbly crank. Does the output gear seem to mesh well/consistently with the clutch ring gear? How is the magnet spinning? I have seen videos on how to fix this by squeezing the fly wheels until it runs true. Could be dicey though (and a lot of work). When replacing the seals, lube them well and be sure to get the inner lip onto the shaft without it folding back.

 

[Cisco]

Bad bearings? just a thought.

 

[DAMIEN1307]

That's good you found the most common culprit, they are prone to wear and more so if the crank is not very true.

Or if gas with ethanol is being used.

 

[Street Ryderz]

Or if gas with ethanol is being used.

Yes very true!

 

[ImpulseRocket]

The crux of using carb cleaner to check for leaks around rubber seals. It causes rubber to expand when it contacts it and can swell them enough to hide a leak. This is why I am a fan of starting fluid or other methods over carb cleaner when checking rubber seals.