2014 STS belt vibration between 55 to 65 mph - which belt dampener? Top or bottom?

[Oldraceman]

I have read some on this subject didn't seem to affect mine until I had to have the rear tire replaced. With covid rides were short and not at any highway speed until this week. I noted now that between 55 to 65 I feel a vibration near my left foot. I've been looking for a belt dampener that can be installed on the ST model. Any Ideas? Please help?

Second thought, is it better t run on top of the belt or on the bottom? I was thinking bottom since this should be the loose side while running. Thanks for any help...

 

[BLUEKNIGHT911]

I have read some on this subject didn't seem to affect mine until I had to have the rear tire replaced. With covid rides were short and not at any highway speed until this week. I noted now that between 55 to 65 I feel a vibration near my left foot. I've been looking for a belt dampener that can be installed on the ST model. Any Ideas? Please help?

Second thought, is it better t run on top of the belt or on the bottom? I was thinking bottom since this should be the loose side while running. Thanks for any help...

I cured my drive BELT vibes by lowering the Belt tension from BRP specs to 160 lbs measured with the wheel on the ground .... using a KritKit guage (see BAJARON) ........ Mike hyea:

 

[Peter Aawen]

:agree: - I'd be checking the Belt Tension before doing anything else, cos if it was fine before, and now that you've had someone else replace a rear tire it's suddenly got 'a vibration near your left foot'.... it can really only be being caused by the tire itself, the wheel balance (unlikely with a single rear wheel) or there's something different in the way the belt/rear wheel is set up - and who knows what the belt tension is now?!? :dontknow:

There again, at the risk of sounding like a cracked record (some of us here will be old enough to remember that sound, while more of us should be able to remember what a 'record' actually is! ) if you've fitted a new OE Spec Kenda on the rear, there is also a reasonably high chance that IT is the source of the vibrations you are now experiencing!! No kidding, they really can be that bad! :lecturef_smilie:

But check the belt tension first, setting it to something like that suggested above; and if that doesn't resolve your vibration issues, then I'd seriously be looking at your 'new' rear tire as the only other thing that's changed lately!

 

[2dogs]

BK911 and Peter gave excellent advice. While you have the rear of your spyder up off the ground hand-spin the rear tire slowly and check it for out of roundness.

 

[frenchbz]

I got mine from Smooth Spyder to stop the clutch chatter on my 2015 ST Limited. It went on the bottom and helped greatly. The chatter was totally eliminated when I started buying my oil change kit from Lamonster Garage.