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Trophy 650 chop 1966, 4 speed box.Accelerates reasonably smoothly to 60mph, goes into severe vibes around 70mph, then smooths to a buzz around 80 onwards. is this normal?- feels like mechanical abuse pushing through the70mph.. its got extended springer forks, and heaps of other odd parts, hardtail etc..so maybe sympathetic resonance, or anyone know how to sort it.

new to old brit bikes, so do htey all do that?
 
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