Rev Counter problem.

Hi there.

I own a curvy sv650 and am suffering some problems with it and cant seem to find the problem.

When the bike has warmed up and i start to open it up the revs judder and jerk alot, the bike backfires and the rev counter flicks about all over the place.

I've consulted all my local bike mechanics (in Hull) and have tried a few things to rectify this problem with no luck.

I have: Check all the wiring, checked the carbs, checked the ECU, replaced the pulse generator & crank sensor and regulator rectifior.

Has anyone suffered any similar problems or have any idea what the cause of this issue could be? I would be very grateful if anyone has some suggestions that might help as this problem has been present for a while now and im starting to run out of patience & money


TIA

Ian.