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I hope you are not riding at 2000 rpm, any time spent at this engine speed under load is close to if not lugging the engine. Guzzi's are happiest above about 3500 rpm. If this is happening at a standstill while free revving the engine, clutch lever pulled to bar you are probably hearing the clutch plates rattle, lever out could be slop between clutch plates and input hub on transmission or play in transmission, dogs, etc. on shafts. Brian