Hesitation More Jetting then TPS
Posted April 06, 2006 - 08:27 PM
Posted April 06, 2006 - 08:34 PM
Posted April 06, 2006 - 08:43 PM
Posted April 06, 2006 - 08:49 PM
Posted April 07, 2006 - 04:27 AM
Posted April 09, 2006 - 05:39 AM
New 05 re-jetted for most of my anticipated riding during the year. The bike had a noticeable hesitation and cut out at constant speed. Checked all the threads and some said jetting and some said TPS. I unplugged the TPS, and did see a little difference but not a lot....... am stoked ....... To each his own, but I am advocating getting your jetting right before messing with the TPS.
Had the same problem...YES, and I think/know the ACV masks and hinders jetting fine tuning...for the unconvinced:
I tried disconnecting TPS and "blocking" the activation of the ACV by spacer to keep the diaphragm valve seated against vacuum - see; www.thumperfaq.com for methods. There have been threads on this before - so I just wanted to see what happened...
WHY - like many I have tried to cure a curious surge at steady speed and throttle setting (on the road)- throttle constant at steady speed with very little engine load (about 60 to 70km 5th gear, slower in 4th).
Disconnecting the TPS made a slight improvement BUT, my bike had way less throttle response and power at less than half throttle - I assume the disconnected TPS adversely affected the ignition map. So, I plugged it back in and rode. Apart from the slight surge I feel (very un-scientific I know) that the jetting was cleaner now in the lower 1/4 throttle setting than before the ACV mod. There was a bit of popping on decel that I could dial out with a 1/4 turn of the fuel screw but that made the bike a tad rich (slight stumble).
For info, I'm using 168MJ/JD red#5/48PJ/40LJ/70SJ - all mods and Q2 PowerBomb.
I feel now I probably need to raise my needle clip, just about make it 95%.
Anyone got PERFECT JETTING??? Apart from INDY of course..
My .02 worth for anyone trying to fool with TPS.