11-08-12, 11:09 AM
Go to your local Yam dealer, get part 15 - thats almost certainly the issue, its a known weakness on the 600, we've heard of numerous cases (on here) of shops trying to oversell on this one. Its a cheap part (less than a tenner, if memory serves), and if it doesn't fix the issue, then you've lost nothing, as its broken anyway...