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Old 02-16-2013, 04:01 PM
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fatdaddy fatdaddy is offline
Motorized Bicycle Elite Member
Join Date: May 2011
Location: San Jose, Ca.
Posts: 1,518
Default Re: new member. long time motorised bike user. need help

Originally Posted by 2door View Post
I concur. What you have is the classic symptoms of excess air entering somewhere it isn't supposed to. Intake manifold to cylinder gasket, carburetor to intake manifold, crankshaft seal.

Yup, I think 2door is right. An easy way to check, (if it will idle long enough, If not, set the idle up for a minute.) is to spray some water on the intake connections. A little water wont hurt the engine at all, and you will be able to tell immediately if there's a leak. It MIGHT kill the engine. At the very least you will detect a change in RPM's. I really dont know how you would check for air leaks at the crank seal.
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