Hi, some of you might remember my previous posts about the partial rebuild I've done of my GSF250 Bandit. The good news is that I fired it up the other day and it starts easily (far better than before the rebuild) and ticks over smoothly. The bad news is that it is idling at 8000rpm!
Some other KBers have very kindly given some advice about this already, but we're still a bit stuck so I thought I'd see if anyone had experienced this issue before.
The first thing I thought was idle speed screw - I had removed and refitted this and possibly got it wrong. So I adjusted the idle screw so far that it was no longer opening the throttle at all, this had no effect.
Next I loosened the throttle off completely so that the throttle was completely shut when closed - there is even slack in the cable confirming that the cable isn't stuck somewhere or has been incorrectly routed. No difference.
Also checked that the slides move correctly and throttle butterflies open/close correctly.
BTW I have been firing it up then killing it after just a few seconds so can't say what happens if it is allowed to run. Not keen on thrashing the nuts off a cold engine that has just been rebuilt.
Apparently an air leak can cause a high idle, but I would have thought that firstly, it's unlikely that I would get a leak in more than one carb and secondly, assuming that only one carb was faulty, I wouldn't think that the engine would run at a smooth, high idle. I would have thought it would be a bit rough?
Now if it is an air leak, trying to find it could prove to be a bit of a bitch - can anyone recommend a good method? I've been advised that an ether spray can be used to find leaks. Sounds good but as mentioned above I don't want to leave the engine running, I need something I can try with the engine off.
Having said that, am I barking up the wrong tree thinking air leak? Maybe it's something else completely?
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