Idling at 5000rpm

[Dougal667]

Morning all. I've a 1990 H2 ZXR 750 (UK Model) Yesterday it started playing up and won't idle at less than 5000rpm. The throttle and choke both open/ close fully and nothing looks out of place. Has anyone any ideas as to what could cause this and a solution to the problem. Thanks Dougal667

[masterofinsanity]

have you had the carbs off the bike as i did this with my gixer and forgot to screw the throttle return back in, butterflies may look closed but possibly not.

[Dougal667]

Nope carbs haven't been off. Bike has been running as sweet as a nut since I got it 2 months ago, died a couple of times but that looks like the battery wasn't holdign a charge, new battery fitted and now this idling problem!!

[masterofinsanity]

has someone messed about with your idle adjuster??

[Dougal667]

Bike as it was when I took delivery of it. Done 3-4 hundres miles on it and all been ok, just started yesterday... Wonder if some sh*t has been picked up from bottom of tank and blocked or jammed something!!! Oh my mechanical knowledge of bike workings is limited... Learning curve has started!

[masterofinsanity]

more chance of there being an airleak somewhere than blockages i would have thought, if you had picked some toad up in the carbs then it would splutter more than anything?

[crushedlizard]

Could be something as simple as stuck choke? Mind you I think the choke idles at 7k doesn't it? Can't remember, but it's bloody loud on a cold early morning!

[Dougal667]

All sortted. Thanks for all your help

[masterofinsanity]

what was it?