13 WR 450 dying when Idling

Brand Yamaha Brand FMF

2 replies to this topic
  • Rengo221

Posted March 18, 2015 - 05:44 PM


Hi guys name is Eric. 

I have a 2013 Wr 450 only put 250 miles on it so far all trail rides.

I live in MN and store the bike in the winter.  I put some fuel stabilizer in before I put it away last fall.

This spring I purchased the FMF power core 4 slip on exhaust and recently put it on.  It says in the instructions no FI adjustments are needed for this slip on and I currently have the non-adjustable ECU in it.  

When I start it, the bike will idle for about 2 minutes before it dies.  It almost seems like the fuel is cut out or the is not enough to keep it going.  The only way to keep it running is to keep on the throttle or have some sort of load on the transmission such as going down a hill.

The bike ran great at the end of the year last fall.  


I run non oxygenated premium gas in the bike


So far I have replaced new spark plug old plug looked very good still.

Drained the fuel tank to put fresh gas it.

Checked air filter. (clean)


Looking for some other Ideas on things to try.  

Thank you in advance,





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  • Slow and Jerky

Posted March 19, 2015 - 02:07 PM


You might want to adjust the idle air, it's the little knob that acts like a choke. Pull it out and turn it. I had to turn mine a few times counter clockwise to get it to start easily. You adjust the idle with it pushed in and c02 when pulled out.

  • Krannie McKranface

Posted March 19, 2015 - 02:22 PM


Turn it before pulling it out. 

It has detents.

Counter clockwise for higher idle.


Turning the know onces it's out does nothing.

Edited by Kah Ran Nee, March 19, 2015 - 02:22 PM.

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