Do any of you guys know what the tolerances are for the valvle stem and valve guide is on a b2501r head? I have some smoke after i throttle up, back off to idle and then throttle up again. its blueish smoke not black as in gas. Any ideas. The valves were reground and all but did not do amything to the guides a year ago. they felt tight. tractor may need rings. got some ordered. just was wondering what the deal is on the guides and valves so if need i can do all the necessary work all at once and have the parts on hand when i tear it apart.
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