@Calum I have exactly the same problem. Any advise would be appreciated. I bought the bike not so long ago it has had a new top end (no proof) but it was fine at first then 1 day it started vibrating at high revs. Is this most likely to be the balance shaft? If so what do I look out for. I am no professional 
G
Geraintuk
@Geraintuk
Posts
-
Vibrating