WR450F Query

6 replies to this topic
  • n000b3rt

Posted December 25, 2014 - 01:37 AM


Since putting an FMF Powercore muffler on the bike, it has become hard to start and backfires slightly. Is this normal or do I need to change the powertune to correct it? If so, what is recommended to change it to?

  • AtomicGeo

Posted December 25, 2014 - 05:49 AM


Couple of questions:


1.) Did you remove the air intake snorkle yet?

2.) Did you install the race ECU module?

  • guru

Posted December 25, 2014 - 09:46 AM


Assuming it is a FI (2012 and up) model, did you swap out the ECU and is your idle at 2000+/- ? Search for CO settings or starting problems/issues. Many here bumped up CO settings. I'm at 10 with the powercore and that fixed the extremely annoying starting situation. Good luck.

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  • n000b3rt

Posted December 25, 2014 - 10:58 AM


1) No we didn't remove the snorkel
2) Are they parts of the off road kit for the WRs?
Thank you heaps, I'll keep you's posted :) thank you to you both

Edited by n000b3rt, December 25, 2014 - 10:58 AM.

  • AtomicGeo

Posted December 25, 2014 - 07:44 PM


Remove the snorkle.  Then if you have the programmable ECU, have it programmed or buyt the power tuner to program it.  It's going to be extremely lean otherwise.

  • Juman5

Posted December 27, 2014 - 04:57 PM


It will still be lean at idle unless you get your hands on a FI diagnostic Tool and change the A/F mix.

  • n000b3rt

Posted December 27, 2014 - 06:12 PM


I think we can do that with the power tune, we're addressing it as we speak, we'll keep you guys posted :D


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