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I should have taken a pic of the little rear handle mac with a spur sprocket I took in last year. Problem was the chain kept coming off he says. Well lookie there the chain has wore right through the spur and cut it off the clutch drum. Made a nice throwing star :lol:.

I just replace when worn by looking, not by chains used. Straight from Madsen's link When A Sprocket Should Be Replaced Worn sprocket good general rule is: one sprocket will last for the complete life of two chains. If you are running an Oregon sprocket, another way of determining wear is to...