When I rode my bike for 3 weeks on the California coast, it had an abrupt closed-open transition, in addition to a frequent backfire. It also started to idle like a Harley, whereupon I knew I had to do something. Rotated the TPS counter-clockwise barely a mm, which solved the problem. When I came back to my home elevation of 6,200 ft, it ran sluggish and felt rich at full throttle, so I adjusted back to the specified voltage. It has none of the backfire, etc. problems at this elevation at the stock position. I have no other engine mods.
I highly recomment the factory TPS adapter to check voltage. It's pretty cheap from the dealer, and will prevent you from breaking TPS pins or shorting it out. If you damage the TPS, you will have to buy the whole throttle body--TPS is not sold seperately!
Interestingly, as opposed to Invader's bike, my fast idle didn't increase at all with adjustment, and I didn't have to touch the secondary.
Last edited by Wyorider; 09-07-2009 at 09:08 PM.