Question about 2005 MBK Skyliner 125

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Hi my brothers 125 thunder lacks power on hills otherwise it starts and runs perfectly any ideas would be much appreciated

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Start with cleaning the air filter and a fresh spark plug. Tighten up the carb mounts at the carb and at the cylinder. If oil is on the head, cylinder or upper front center case, be certain the head bolts are tight. Check for hardened rubber fittings and seals between the carb and the head. . If that gives no joy, have a mechanic do a compression check. Chances are very strong the intake and exhaust valve need to be re-seated because carbon buildup on the face of the valves is allowing needed compression to go out the exhaust. You didn't say the bike was smoking so it sounds like the piston rings are okay. Please rate my answer. Thanks.

Posted on Apr 08, 2011

Testimonial: "excellent just the sort of things i needed to know your assistance is much appreciated"

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