My 1974 FSIE was built from 4 of them,did 55mph, and once held 60 for 5 minutes after a downhill run 'til it holed the piston. It DID do 70 once, when my mate on an RD125LC stuck his foot on the back of the seat
63cc big bore kit, chopped induction valve, exhaust port enlarged and raised and the head skimmed.
It'd only run properly on 4 star.
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