Constant speed surging.


1 reply to this topic
  • Regalman

Posted August 18, 2009 - 06:38 AM

#1

I have an 08 WR450 with the stock AIS kit and its suggested jetting. [I'm in MI at about 1k feet of elevation.]

The bike runs flawlessly on the trails, but if I'm on the street at a constant RPM it starts surging.

Question 1 - What are the ramifications of riding a few hours of street duty this weekend without making any changes? I'm assumings its a lean condition? Will it be lean enough to damage the motor? Is there a bandaid fix (like opening the airbox door, that would help the sitaution temporarily until I can fix it properly.)

Question 2 - What is the correct fix?

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  • 123BigcoopDawg576

Posted August 18, 2009 - 06:45 AM

#2

Question 1 - What are the ramifications of riding a few hours of street duty this weekend without making any changes? I'm assumings its a lean condition? Will it be lean enough to damage the motor? Is there a bandaid fix (like opening the airbox door, that would help the sitaution temporarily until I can fix it properly.)

Question 2 - What is the correct fix?


1) Assuming your jetting is correct, the stutter is not related to jetting...its related to the TPS (throttle positioning sensor). All the WR I have ever been on have done this on the road. I just dont ride in that spot.

2) Might want to read these:
http://www.thumperta...7&highlight=tps
http://www.thumperta...0&highlight=tps




 
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