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2007 KTM 50sx Pro Senior Help

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Hey gang, just picked a clean 2007 KTM 50 Pro senior for my son. Bike is clean, great compression, starts first kick and lots of power. Came with the stockicon1.png black exhaust. During light riding there is a little black oily fuel (very little) coming from the exhaust at the head. Bike smokes a little at first start then cleans up. Previous rider was running Amsoilicon1.png 40:1. Could it just be the exhaust seal? He also gave me the chrome pipe with Pro Circuit Silencer which I believe the bike comes with stock. Any pointers would be great.



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