Not sure how old it is but if I heard a metallic banging sound coming from my engine I'd start disassembling it until I got to the root of the problem. It could be anything from a broken piston ring, a c-clip that came loose or problems with the variator or the clutch and also something in the transmission behind the clutch. Sounds like you replaced the differential? Is that what you mean by the FNR box? Unless I'm mistaken there is a C clip that holds the output shaft of the transmission to the differential. That is how my buggy is set up. If you left that out...Not sure what would happen.
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