I had some hanging idle issues recently after an engine rebuild/836cc kit and thought Id share my experiences here in case someone is searching for an answer in the future. I searched all the posts "hanging idle" and did learn a lot but none of those were my particular problem. Here is what I did:
1. Would idle great at rest. Balanced the carbs and all were even. Would go for a ride and idle would hang around 2000rpm after a few miles.
2. Tightened all band clamps and made sure no air leaks at idle - none. Go for a ride and idle would hang.
3. Changed carbs to a freshly rebuilt set. Still hanging idle. Ok so it wasnt the carbs.
4. Go back to original balanced carbs - a comment by MikeR got my attention when we were balancing carbs: those band clamps are not OEM are they? No they were the plumber type ones but fit perfectly in the groove. However knowing better I suspected that at idle they were fine and when riding they probably loosed up a little and caused the hanging idle. So replaced all engine-carb clamps (x8) with OEM - got a great price on these from Parts Unlimited.
5. Reinstalled carbs.
6. Spark plugs were DENSOs but I had no record for last 7 years of ever having changed them. Could find DENSOs easily so opted for D8EA for now. Installed new plugs.
7. Test ride: idle at 1200 - 1400rpm. Sits there quietly. Good throttle snap, nice smooth acceleration. Hanging idle gone.
Now to try and get a little more from the 836 cc engine (K4) as I feel my 810cc bike (K2) is a little snappier, more power and accelerates better. I suspect its the megacycle cam MikeR put in....
Hope this helps someone else with hanging idle.
cheers
Andy
