Quote:
|
Originally Posted by shift1313
its probobly unrelated to the clutch and just a loose something some where.
|
I agree. But those things can be hard to find (as you now know). Get yourself a small rubber hose (like a fuel hose from an auto shop). Stick one end in your ear and point the other end around the engine area while the bike is making the noise. Move the end of the hose around to find where the noise is the loudest. Then stick your fingers in there and try to find something loose.
The reason you hear it when the clutch is releasing or when the engine is revving is because of a physics principle called simple harmonic motion. The thing only rattles when the harmonics (vibrations) are at the right frequency. If you want an example, stand up a picture frame (the kind with glass in front of the picture) on top of a piano. Play different notes. Every note on the piano makes sound (vibrations) at a different frequency. You'll find a few notes (typically about four to six) that will make the picture rattle. None of the other notes will bother it at all. Your bike works the same way. When you get the frequency just right, the loose thing will rattle.
Curt