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Some doubts

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Having some troubles with an old bike.. I running the last night and after arrive at home I shut off the bike. And the next morning won't start

 

Check the spark and looks blue I think is good

Clean the carb

 

Put a new top end

 

Not luck

 

I put 4th gear and pushed the bike with a friend and bike starts but won't idle and smoke a lot

 

An air leak or bad seal on stator side I don't think on clutch side cuz oil level are the same

 

Electrical issue? Carb?

 

I've changed the cdi and do the same think

 

Bike are yamaha dt

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Replace both crankshaft seals if it's a two stroke.  One will leak air behind the stator and the other will suck oil into the cylinder.  Do those and report back.

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