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  1. Yamaha Dirtbikes
    Hi I recently bought a 1993 Yz 80. I was told that it has a big bore kit on it but I don't know what size it is. My bike usually bogs in the powerband but sometimes it runs good. It usually runs good in lower temps. I'm mixing my bike at 32:1. My pilot jet is #40(+5 than stock) and my main...
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