She jolts when I rag her!

[Matt78]

Irrespective of gear, when I reach (or ease off to) 3,100 revs my Chim 500 jolts violently. 3,000 revs absolutely fine. 3,200 revs absolutely fine. Any advice gratefully received!

[RumbleBee]

Mine did that after it had been layed up for a while. 600 miles with good fuel and it went away. Has yours been layed up?

[Matt78]

She had 3-4 months over the summer without use, but I've done 1,500 miles in her since then with a couple of 250 mile trips. I thought it was a fuel issue to start with but not so sure now!