Ihave a rather annoying problem with my Yamaha FZR 1000 EXUP it stalls at 4000rpm and i have gone through ta exhaust valve and the servomotor and ruled them both out.

Maybee its the cid ignition but before i go out to buy a new one i would like to hear from anyone who has had similar problem and on how they fixed it.

Someone told me it also could be the ignition coil.

Hope to hear from someone qualified

Ron

Stalls? As in dies? Or does it just not want to rev higher?

It just wont run any higher and if i switch it off and on again quickly then it runs normal until i get below 4000rpm

It just wont run any higher and if i switch it off and on again quickly then it runs normal until i get below 4000rpm

Have you unplugged the exup motor? That could be it. Plug it back in and retest