how can I fix my aprilia rs125 ?

I had my engine rebuilt was fine until I left it for 2 weeks then tried turning it ova and wont start . for sum reason it keeps leek in petrol out of the joint of exhaust and can part . please some 1 help as my so called mechanic is usless
chris mcginty 1681, May 2012


done
check carb. needle valve could be stuck open. and not shutting petrol off.(float bowl overflowing.)

ray b, May 2012
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