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Message: [QUOTE="yankeefan4life72, post: 1045132, member: 55994"] I recently bought a 2002 cr250 and I re-jetted it with a JD jett kitt.I followed all reccommendations that came with the kit.I also put a pro circuit full exhaust on it.Now I hear a rattling noise sometimes.it does not do it at idle.only when i am moving.mostly at low speeds.Like up to 1/4 throttle.I thought it was lean so i put a 410 main jett in.That did not fix it.Still making noise(pinging)??I also have an exhaust leak.where the pipe connects to the motor.it is not sealing tight.but i heard the noise before i put the pipe on.jd reccomended a 400 main jet.what do i do??I think i found the cure for the exhaust leak:[url]http://www.denniskirk.com/jsp/product_catalog/Product.jsp?skuId=431283&store=Main&productId=p431283&catId=109&leafCatId=10901[/url] but that pinging orwhatever it is is driving me mad.I dont want to damage my motor.please help thanks [/QUOTE]