This thread is absolutely fascinating. Could be the "best kept secret ever"?
2012 bike here...
- not exactly happy with the throttle response before. quite snatchy when rolling from a closed throttle at any speed. i thought it was because i never synched the throttle bodies (50,000+km, valve clearance done).
- (before) cold, performs very well. hot, not so well.
(after) good throttle response, engine hot or cold.
- never noticed any snatchy feel when rolling the throttle on (from closed) at any speed.
- never did the procedure a second time.
Hey Brian, here's a link to what has been mentioned on this thread, concerning TPS reset procedure, for BMW motorcycles. Google shows links to similar procedures for other makes, too.
In BMW's case, it has to be done after replacing or disconnecting the battery. Just saying, and the video posted earlier shows that the reset does work. As to why it isn't in the owner's or service manuals, I don't know, but I tried it over the weekend per the video, and it did work as reported.
Not starting a pi$$ing match, but have known about this reset procedure for years, from other makes I've owned. tomp
http://www.i-bmw.com/showthread.php?t=636
Brian: I believe it is required to turn the throttle twice for it to take effect. You also have to shut off and re-turn on the bike for it to take effect so its not like its easily undone or mis-calibrated. Im willing to try later as I've already un-calibrated and re-calibrated with no ill effects. I do know that this has definately made a huge difference for me, and while it may not be in the service manual, it does work, as many have noted since this thread began.
Its an electronic device. They do the dumbest things at times.
Again, not to start a pi$$ing match.
...let's find some documentation about this.... and I do not mean a thread on a different forum; something in the way of a manufacturer's documentation works great for me. And not limited to Kawasaki- any Japanese vehicle mfg. doing this would be absolutely fascinating to me.
Brian
If I have time tonight I will go through this procedure and check and see if it actually works.
I can connect the KDS and check my TPS readings, and then "calibrate" the TPS manually, and check the readings again. Further to that, I could actually "calibrate" it incorrectly, and then check the readings again and see what the ECU has to say for itself;).
It's not documentation, but it's as close a test as I can do to prove the theory or not.
<snip>
Rem
FWIW, Here's the FAQ's on the JuiceBox TPS recalibration. Similar to what has been discussed here, but with the engine running. FAQ #4 is the referenced one. 0% to 100% to 0%...simple...
http://www.twobros.com/Perf_Products/Juice_Box_Pro/JuiceBox-FAQ.htm
Outstanding! I would absolutely accept that kind of data as proof; exactly as you say, you should be able to "calibrate" it to, say, 1/2 throttle as WOT and then back to actual WOT over and over again if this works. Even if you miss by 10%, it would be incredibly obvious as there would be a huge change in the interpreted value of the throttle position sensor.
Great idea- I look forward to hearing what you find. One of the best things to happen around 'here' was you getting KDS and looking in all the nooks and crannies and then reporting the info. Good stuff, and thanks for sharing.
Ok, so my lovely wife took over the BBQ so I could execute this important test...lol. She's so awesome...lol.
Ok, I did four checks with the KDS:
<snip>
I'm not saying that this TPS calibration doesn't work...but the numbers above show what my bike did before and after this procedure.
HTH,
Rem
Been out and about, come back and, well nice to see some form of science being brought in. I won't can't dispute anyones findings or results. I can wish we had a KDS on hand for those having success to see the numbers on the KDS. Rem, do you have a PCV on board? Curious as to an apples to apples result.
Brian, it may not be published for the very reason to pointed out, EPA and all that nanny state stuff. As a curious sort, I would almost expect you to place a line on your throttle and a corresponding line on the throttle housing, warm the bike up, shut it off, try the procedure at say %50, turn the key off, start the bike and take a ride. See if anything happened. Nothing lost in trying. If memory serves me right you have a PC3 installed? So it may not be the same variable to validate what happens on other bikes, but then again???
Again, no doubt in my mind it has worked for at least one member and results like that are hard to attribute to the placebo effect a say, new farkle has on an owner.