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OK, so noone wants to get involved in my other thread!! Found my problem today, kinda!!!!! Bypassed TPS on Carb by jumping blk, and yellow wires in harness w/ TPS unplugged. Figured that since it now would run, that it was a bad sensor on carb. Drove over to Tucson and picked up my other xc, stole the sensor off it and put it on at the track figuring my sensor was bad. Nott!! It still would puke out about mid throttle. With a voltmeter on the coil you could just watch volts go to zero at mid throttle, Now here is where it gets interesting!! Stole a sensor off one of my YFZ's and tried it and it worked fine. Except to start it you had to twist it real far forward, and then once running you were able to rotatae it back to put bolt in. WTF! I would lift tank up/ w side cover off, take bolt out of TPS sensor, start it then rotate it and put bolt in and let it run until our turn on track. What a pain in the ass!! What the heck, someone explain this to me!!
 

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OK, so noone wants to get involved in my other thread!! Found my problem today, kinda!!!!! Bypassed TPS on Carb by jumping blk, and yellow wires in harness w/ TPS unplugged. Figured that since it now would run, that it was a bad sensor on carb. Drove over to Tucson and picked up my other xc, stole the sensor off it and put it on at the track figuring my sensor was bad. Nott!! It still would puke out about mid throttle. With a voltmeter on the coil you could just watch volts go to zero at mid throttle, Now here is where it gets interesting!! Stole a sensor off one of my YFZ's and tried it and it worked fine. Except to start it you had to twist it real far forward, and then once running you were able to rotatae it back to put bolt in. WTF! I would lift tank up/ w side cover off, take bolt out of TPS sensor, start it then rotate it and put bolt in and let it run until our turn on track. What a pain in the ass!! What the heck, someone explain this to me!!
I'll forward this to a friend of mine...he is an expert at this stuff...Computer Programmer...he loves a challenge like this...we'll see what he says...hope we can understand it!!!?
From what I've seen on other setups it is the voltage range that requires adjusting I.E. at closed throttle it will be 0.25 volts then as the throttle opens it goes through the range to a max (WOT) at 0.835 volts if at half throttle it is already at 0.835 then when you go over it shuts the system down...something like that?...it has to be fine tuned and if anyone can do it MartyMoe can...we'll see what he says..
 

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Got this back from Mike Myers he is another expert mechanic and has done a lot with TPS's...please email him and Marty both with your TPS problems so they can give us some clues as to what is possible:

Cole, I'm heading down to my dealer tomarrow. I'll take a look at how it is set up and get a copy of some info out of the manual. I'll be in touch sometime tomarrow night. I just need some more info. If you have any more info then send it to both Marty and I and one of us will be able to help.

Mike & Marty's email addresses:
[email protected]
[email protected]


Marty/Mike,

We are all having a time with the TPS on the KTM ATV's! Could ya'll help us out
with any suggestions on what to do? If you unplug it from the FCR Carb the Quad
won't even start. If it gets out of adjustment it will not start...if it gets
out of whack it's hard to get straight again? What gives on these things? We
know that they retard the timing at closed throttle for easy starting and then
allow the timing to advance with the opening of the throttle or FCR Slide...we
have tried bypassing?...What can we do different...I know both of you are
experts with the TPS...I am CC'ing Bronson and Travis on this so we can all
hear what you all are thinking? Forum link is below please join up and help us
out!!

Thanx for any suggestions or help!

Best Regards,
Cole
 

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This is what Marty sent me back in reply...so someone needs to measure the voltage or resistance on a running machine...and then measure it at WOT also...it should be possible with the Key in the ON position...

Cole,

If you don't have the manual, just read the voltage or resistance on one
that works, write the number down and match the one that doesn't with
the same value. I wouldn't recommend bypassing it because it's going to
give you a retard when you start it, but it will also increase your
timing on the top.

Martymoe
 
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