JamesW Posted October 16, 2007 Share Posted October 16, 2007 My 04RT has always had a tendency to surge ever so slightly at slow speeds in low gears and the idle has never been constant or smooth since day one. Now I have used a twin max for accurate TB balancing and I have done maticulous valve adjustments and still the machine has had this slight tendency to surge at slow speed. So, a couple of months ago I bought a Techlusion R259 which did seem to help smooth the idle and surging was reduced. I noticed that the exhaust began to smell of un-burned fuel and the plugs had darkened (black)considerably. I began to think about the throttle bodies and how to adjust them and came up with this procedure; (1)Remove the brass screws, clean them, re-install and turn them in untill they seat then back each out exactly one full turn. (2) Warm up the bike and with Twin Max connected balance throttle bodies at idle using the throttle stop screws only NOT THE BRASS SCREWS. When finished make sure throttle stops are both contacting the stop screws when at idle. (3) Run up to about 3K RPM and adjust sync with throttle cable adjusters. When I finished with the TB adjust guess what? No more surging, smooth idle for the first time in 25K miles, was able to re-adjust Techlusion for less rich at idle. I could have maybe saved my money and not bought the Techlusion but it does add a bit more fuel when accelerating which I kind of like but could easily have done without. I called Bing Agency and discussed this method of TB adjust with them and they agreed. The thing to keep in mind is that the brass screws are mixture adjusts and should not be used to balance TBs. Balance is achieved by adjusting the stop screws. Anyone with airhead experience with the old Bing CV carbs will see a similarity with this method of TB adjustment. Oh, before I removed the brass screws for cleaning I seated them and made note of where they were set. The left TB brass screw was out about 3/4 turn while the right was slightly less than 1/2 turn. No wonder the bike ran lean. Link to comment
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