rattle or rumble

Ok Since We Got The FCR Fitted To The 400 2 Weeks Ago The Bikes Now Making Funny Noises On The Clutch Side I Think. We've Only Ridden The Bike 2 Laps Round A Field A Couple Of Times Since Fitting The Carb. The Sounds Go/Quieten Down With Clutch Pulled In. My Guess Is The Gearbox Is Making...