Re: 2000 K1200LT Idle issue
Welcome to the forum Jeff. What year do you have?
No, it doesn't take too much to push one of these to 3 digits.
As for your issue, there are several things that can cause this and none of them are all too easy to discern, An air leak at one of the vacuum lines ( cracked or being off the stub) is often a cause of an unstable idle. Only way to tell is to go in and look at them. The TVA hunting can happen if someone messed with the screws and the relationship between the Throttle Body and the TPS is off. Messing with the screws on the TB is not recommended as you can go south really quickly. TVA's are very simply a screw motor driving a wheel to extend and retract the TP stop. It will cycle at power on so listen for it. There is a pressure sensitive switch in the stop end.
If you get the covers off her, you can look at the screws and see if the blue paint has been chipped off, especially on the one behind the TVA. As little as 1/4 turn can cause what you are experiencing. TVA's don't go bad very often. If it is idling at all, then it is likely doing something. Sometimes in service, the TVA bracket is used to pull off the TB off the bushings and that can bend that bracket a little messing up the adjustment.
Also check the springs on the TB all along and see if someone has popped one off trying to lighten the throttle feel.
While you are looking at the springs, examine the rubber bushings supporting the TB. They can get old, dry and crack allowing excess air in and mess with the idle.
Less likely but still a possibility is an air leak in another place like under one of the intake manifolds. Corrosion can get underneath and compromise the O-ring underneath each one.
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced
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