That was my question as well, i just emailed Bill Blue for the answer.

 

I'm pretty sure the sensor is not needed. I know it has been discussed on here. Might be a tough one to search for though.
Dan

 

If the TPS on the KLX works anything like Kawi's other TPS equipped carbed bikes, it uses a 3d map to deterimine ignition timing for better "driveability".





If it operates the same as the system on my 6R uplugging defaults the "ecu" (ignitor) to a WOT map. I actually unplugged mine (on my 6) after hearing from guy who was talking to the Candian Kawasaki Superbike team back in the day that the default WOT map was actually more aggresive than what the TPS would advance timing (unless you messed around with the TPS, but its easier to just unplug it). While i've never had the bike on a dyno it does feel like it has more power w/o the TPS plugged in.

*edit* A guy named Sean Stasiak did some work a number of years ago with a Kawi ZRX1100 and had some pretty nice charts and graphs showing this. I'll see if i can't dig them up.

 

Wildcard -
Now that's some interesting information. Anyone around here with the stock CVK run unplugged?

 

I have a 07 KLX, and I can tell you that the TPS signal is not used by the CDI, even though it is connected to it. It does not alter the ignition timing at all, at least for the north american 07. I know this from having put the CDI on a test bench exactly for this purpose.

 

Interesting, i wonder what the hell the purpose of the TPS on the older KLX is for then. The sole purpose of the TPS (KTRIC) on the sport bikes and similar inline fours is ignition timing.

 

I guess they had the intention of using 3D mapped ignition (i.e. changes with both rpm and tps) but had not the time or resources to implement before going into production. The benefits of 3D mappings are not enormeous, thus the decision to drop it rather than delay market introduction. The TPS stayed even if unused, simply because it was designed in. Removing it would require redesigning the harness and throttle axle cap.

This is just my best guess...

 

Yesterday from Bill Blue:
Hello Joe,
The electronic plug in is a Throttle Positioning Sensor that don't work on our bikes. We have used a timing light on the bike & rotated the TPS there is no difference in the timing. Our local dealer tells me the carb came off of a bike that had a TPS that worked. I ni tie the plugin to the frame out of the way.
The TM33/34 dont have a TPS.

Thanks
Bill

 

Anyone know the C.R. of the JE piston used in the 351 kit is at?
Thanks

 

Ask Bill then tell us please.