Vibration at 45km/h  By  hurricanehannon (Read 851 times)

Hi,

The Vibration seems to start when I reach about 25km/h. Then as you go along it sounds like a revolving droning noise. The scooter won't advance past 45km/h although it seems to want to push on, but feels as though it has reached it's limit and is being held back. It seems to be enimating from the engine area, but you feel it right up through the handlebars. I recently swapped out the exhaust for a standard replacement, but I was slightly concerned when the
packaging referred to a 4 stroke rather than a 2 stroke. If fitted ok, and I was asuured it was ok, but could this also be the cause? I understand that 2 stroke exhausts need an expansion chamber. This one does have one, so I'm assuming it should be ok. The other thing I have recently fitted was a compact air filter, removing the standard one.
Regards.
HH.

Oh also do you have an exhaust gasket on it . That took out a nagging vibration big time when I put one on mine.

You may also want to check for a groove in the drive faces of your variator. You can get grooves from riding at one constant speed and the belt will catch and drone along vibrating as it fights to skip out of the groove and then back in again. Some time a kevlar belt with a raw edge can cut a groove in very short time.

You usually check for the grooving with a metal straight edge and if its not too bad can dress it out with a flat file if your carfull to evenly work your way around. Most times your better off just replacing the variator and the belt.

Occasionally the groving can be caused by an out of place kick starter return spring.

If you have a very bad vibration it can cause muffler and rear body failure along with damage the clutch and gearbox input shaft bearings. If you find that you have belt vibration and grooving you need to check the clutch and the gearbox replacing anything thats damaged or you will continue to have problems as the clutch shaft wobbles against the new belt.