Posted February 12, 20178 yr I have a 2007 TTR 125 with a 150cc big bore kit. It currently has a stock 13T on it and I want to change it. I'm thinking about putting a 10T on it, and I've found many that fit but most of them say they're for pit bikes. Is it a bad idea to put a counter sprocket this small on my bike?
February 12, 20178 yr Yeh, ,go up 1 tooth, since you've upped the bhp.. [ unless your trial riding]/
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