Hey Guys i gotta few ?'s to ask yall bout my 91 cr250 first off what would be the best pre mix ratio for it. Im real tired of filing plugs. Ok next what years are the same for this bike i need a kick start for it and dont know what years or model kick start will fit on it. And finally how hard is it to change a clutch on a bike ive never done it but this ones in need for one real bad..... well any input is good so send some info my way thanks guys