Tps


7 replies to this topic
  • boscoe

Posted January 09, 2008 - 01:08 PM

#1

Hey, I know the TPS subject is a rerun but, I finally adjusted mine on my '04 450 and the stutter is way smoother. I removed my TPS during my first jet change by accident and when re-assembled ran very rough. I ran it disconnected and got it pretty good by jetting but it still stuttered. I finally adjusted the TPS to about.74 volts and It runs much smoother (street). One of the things preventing me from adjusting was I couldn't get a voltage reading off that TPS connector. I finally shoved some safety wire into the plug and I got a reading.

  • tweav

Posted January 09, 2008 - 04:34 PM

#2

I have a 07 wr and its a real pain to get to the tps . I was think about putting a variable resistor inline back at the cdi to correct my voltage . then once I get it right take a ohm reading off of it, then just put in the proper resistor. Do you guys think this will work ? because I'm tired of pulling the bike in half to work on the carb.

  • Humunn

Posted January 10, 2008 - 05:04 AM

#3

I have a 07 wr and its a real pain to get to the tps . I was think about putting a variable resistor inline back at the cdi to correct my voltage . then once I get it right take a ohm reading off of it, then just put in the proper resistor. Do you guys think this will work ? because I'm tired of pulling the bike in half to work on the carb.


Are you sure your jetting is correct? I just went through all of this and I too was tired of "guessing" at what the correct jetting cocktail might be. I took mine to a dyno and for $160 it was completely rejetted to my elevation. Runs perfect now - no stutter - and I did not mess with the TPS at all.

According to the jetting expert there are two kinds of stutter produced by these bikes (at least the 07s): TPS and carb. From all I read you want to eliminate the carb first, then deal with the TPS.

Greg

  • tweav

Posted January 10, 2008 - 05:20 AM

#4

I had my bike on a dyno and yes the jetting is way wrong .But I get both kinds of shutter one as I'm twisting in the other at 1/3 to 1/2 throttle cruising . I've got all the stuff ordered to fix all the carb issues . But if I don't get rid of all the shutters I am not going ever be happy with this bike. So what ever it takes .so what jets did you end up with ? what was your target air/fuel ratio?

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  • Humunn

Posted January 10, 2008 - 05:29 AM

#5

I had my bike on a dyno and yes the jetting is way wrong .But I get both kinds of shutter one as I'm twisting in the other at 1/3 to 1/2 throttle cruising . I've got all the stuff ordered to fix all the carb issues . But if I don't get rid of all the shutters I am not going ever be happy with this bike. So what ever it takes .so what jets did you end up with ? what was your target air/fuel ratio?



Agreed. I was in the same position as you but now it runs perfect. So it can be done. Run a search on my username and you should find my setup. I posted it not that long ago.

Greg

  • tweav

Posted January 10, 2008 - 07:48 AM

#6

what I think is weird about my bike on the dyno . is it said my bike is way rich . at idle it was at 11.4 to 1 air fuel .with the stock pilot I think think is very odd most stoch wr 450's are lean.

  • WR450RICKO

Posted January 10, 2008 - 05:43 PM

#7

Dyno it, don't touch and ride. Best $100 I spent

  • Snakko88

Posted January 10, 2008 - 10:58 PM

#8

03' wr450 Vortex cdi map 8 no stutter.......




 
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