| Author | Message | ||
     Cecilsan |
Hey guys..this is repost from buellforums.com so the info is condensed. I have some issues w/ my bike that I've tracked down to the TPS. I started getting a surging issue (similar to another post by Toniportray) around 30-50 MPH when in 2nd-3rd gear. The bike was also sluggish. After researching and tests I disconnected the TPS and the issue went away. So I took the bike down to the dealership to have the TPS reset but the issue is still there...so now my questions is: Does anyone know what would happen if the TPS was bad? Would it still read out the same when resetting it? The dealership said they configured it fine w/ the breakout box and volt meter but were unsure what a TPS would act like if it was bad Also...trying to up my gas mileage but keep performance....what jetting should I be at - Live in Oklahoma (1,300 ft above sea lvl) - Bub Exhaust - Have done basic air box mods (cut outer flange, cut inside wall) - Iridium Plug Currently running 45/175 but hit reserve at 75-80 miles. When I first got the bike it was jetted by the dealership at 48/170 with Bub Exhaust and everything else stock | ||
| Ezblast |
If your TPS is snafu, it may be defaulting on to the WOT curve, which doesn't hurt anything but mileage does suffer, your jetting is fine, enthusiastic riding will lower the mpg's as well. That surging is a lean condition or the oposite - a lack of air (check that filter is clean,nothing stuck in exhaust) check das boot, replace if old, or not been replaced since assuming ownership. My Daily driver gets 40 to 45mpg, yet my toy constantly gets 50 plus mpg. EZ | ||
| Gearheaderiko |
A bad TPS can cause surging switching between partial and full throttle settings. I dont believe that any electronic part that tests 'good' cant still be bad. They often just arent that cut and dry. Bad testing bad is bad. Bad testing good may still be bad. My mileage is about the same as yours (40-45mpg) and I no longer run a TPS (or VOES). It didnt get any better before my engine mods with the TPS connected, but now I'm probably running an extra 4+hp and 1000 rpms  I've changed everything too and I never found anything that made a difference (before the mods)  Ez's "toy" is probably MUCH better tuned with a better piston/combustion chamber match and gets more HP and better mpg (it is possible  ) than the "daily driver", which is closer to stock. | ||
| Cecilsan |
Thanks for the replies. At some point if I feel like it I'll replace the TPS to see if that resolves the issue (it should since the issue isn't there with it disconnected). For now I'll just disconnect it. | ||
| Gearheaderiko |
PS I failed to mention that the TPS could also aggravate a bad ignition module. More likely a faulty TPS though. The TPS wires can also rub through, so before replacing look for that. | ||
| Reuel |
Sorry this is a bit late. Check the TPS by disconnecting the connector at the TPS. Measure the resistance between a middle pin and a side pin. Turn the throttle slowly, and the resistance should change smoothly. If not, it's bad. | ||
| Ezblast |
Thanks Reuel! EZ | ||
| Jon022191 |
Hey guys I'm new here I've had a few blasts now but this one needed a little work, obviously I'm a dummy because when I was rebuilding the carb I took off the TPS and threw it off calibration, i hooked up the wires to my tester like he manual says and it works fine, until I put it in the carb. It's as if a peice is missing because the throttle has no effect on the voltage at all, but if i take the TPS off and turn it with a screw driver the voltage fluctuates like it should. I'm hoping someone out there knows what's going on, any help would be appreciated, thank you |
