racurley wrote:Ok, I've read a bunch of topics on this (most referencing Roger 04 rt!) and thought I had it figured out. I connected to the TPS as described and found that it was measuring quite high (like .85V) so I reset it to spec at 0.36V by loosening the screws and turning the TPS to the right setting. I reset the motronic per normal. I set the BBS to 1.5 turns open and then used my manometer to balance.
It had the effect of getting rid of the rough idle for sure. Very happy about that. I was also able to get the idle around 1,100 rpm which was lower than before. When I blipped the throttle, it was not settling back to the same rpm and was not coming back into balance consistently. After doing my best on balancing, I went for a ride. Still surging under 3,000 rpm.
Decided to do the zero=250mV as instructed. I pulled the left TB off, cleaned it up, and then connected my DMM to it. It read 0.00V but would go up when I moved the throttle. Hmmm. Is this because I reset the montronic? I wasn't expecting this. I was expecting it to be more like 360mV like I had set it before. I loosened the TPS, loosened the stop screw, and adjusted it to 250mV. The position was quite a bit more open then before however (before, more positioned to the right, now more centered) Then, used the stop screw to move it to 350mV. Turns post contact was like 1/4 turn. Set the locking nut and reinstalled everything using a little silicone grease to guard against leaks. Adjusted the right TB stop screw the same amount (as far as I could tell).
Put play into the throttle cables by turning the adjusting screws cw so they were pretty low. Opened both BBS 2 turns. Reset TPS again (pulled fuse 5 for a few minutes, reinstalled, opened/closed throttle 3 times) with key on run. Started the bike and it's idling at like 2,600 rpm. I closed both BBS completely and no change. Deep sigh.
Well, I'm clearly not understanding something.
Believe it or not, you’re closer than you think. I believe you misunderstand the z=250 process and I can see you’ve done it wrong. Go back and read it slowly. Resetting the Motronic is NOT part of the problem.
The TPS is never set to zero volts. The lowest valid reading that a TPS can be set to is 250 mV. Here is a high level outline for just the z=250 part (step 1.5) but read the full procedure in detail.
1) all cables loosened per the procedure. Make sure the fast idle lever is DOWN.
2) both TB fully clean
3) both throttle body screws stops loose
4) both BBS at 2.5 turns (not 1.5, they need to be open enough so you get a good idle, you’ll adjust them later. They can be open 3-3.5 if you need that to get a good idle. Just make sure they are open the same number of turns EXACTLY)
5) both TB butterflys accurately centered
6) both TB butterflys closed fully but not forced
7) set the TPS to 250 mV, lock down the TPS and don’t touch it again
turn the left throttle stop screw until the TPS read 340 mV (360 is NOT correct, you didn’t get it from my procedure) and lock the left stop screw in place and never touch it again. (Make sure to count the number of turns from when the TPS voltage started to move to when the TPS reached 340 mV.)
9) Set the right TB stop screw to the same position as the left by turning until contact plus the number of turns counted on the left side it step 8. Don’t lock it yet.
10) start the bike, warm it up, use your manometer to adjust ONLY the right TB stop screw until balanced (don’t worry what the RPM is yet) and then lock it down making sure it stays balanced and never touch that screw again
After you’ve done all that, then Follow my detailed TB sync to the letter.