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rocker arm

  1. 70's bmw r75 head compatibility?

    hi, i broke a rocker arm in the left head on a 70's (not exactly sure what year, think its a 72) bmw r75/5. im looking to replace the entire head, and am curious if its the same head for the r50 and r100 and rwhatever. also, is there any difference between the years?? thanks for the help