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A friend has a 1958 750 spider whose tach stopped working because that gear came loose,so I know that at least on the early cars,they're a press fit. I think it's a press fit for the 1600s,and later 1300s,but not sure.You probably know this,but the parts books don't show a part number for that tach gear,probably why you're asking.Also,imagine what a PITA it would be to machine that intermediate sprocket and tach gear as one part,just sayin'
 

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It is a press fit, fairly light interference, and most tap out with a brass drift and steel hammer. Those that don't press out with my hydraulic press.
 

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Had one loosen into the WP once and drifted it back where it belonged along with stud and bearing mount to keep it there. It might be possible with a collet to grab it and slide hammer puller. No, never did remove one in place.
 
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