13 WR 450 dying when Idling

Brand Yamaha Brand FMF Racing

2 replies to this topic
  • Rengo221

Posted March 18, 2015 - 05:45 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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  • Moose Lee

Posted March 19, 2015 - 02:50 PM


I had the exact same situation with my bike. I installed the competition ecu and removed the throttle stop screw and it is a night and day difference. Idles perfectly and performs flawlessly. Hope this helps


  • Rengo221

Posted March 19, 2015 - 05:35 PM


Did you put a map in or just plug in the new ecu?

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