Hondacbr600 (having problem at 6000revs at steady 70mph bike juddering ?

Question

as if there is a fuel problem or air . i dont no tried everything i can think of . if i increase revs no broblem but as soon as i stop increasing speed it starts to jump again only over 65-70mph and above.

Answer 1

I suspect its not an engine problem. Narrow it down: does it judder at 6000 revs in other gears, or at 70mph in other gears? Does it judder if you kill the engine & coast decelerating from 80?

If its not the engine, any of the following could cause rough feedback at a certain road speed:

* Front forks arguing - Fit a decent aftermarket fork brace.

* Tyre out of balance, probably front - Take it to a good bike shop, not a Chimps 'R' Us tyre place.

* Drive chain slack, badly worn, or hooked sprocket teeth - adjust/replace.

* Fairing or bodywork vibrating - tighten or refasten.

* Free play in head bearing - adjust/replace.

* Faulty steering damper if fitted - strip and rebuild.

* Badly secured panniers, centre stand, or passenger - jettison!

Answer 2

Your basic problem is posting in the cycling area.