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Old 08-24-2014, 03:08 PM   #1
busbus40 OP
Joined: Aug 2013
Oddometer: 1
WR450 Stops Running @ 8000rpm - ideas?

Would love to hear some ideas.. Recently, my bike has decided to stop running @ 8000 rpm and it is running under power below that. It starts fine and takes throttle, but then it runs under power until it cuts out @8000. We've put in a new ECU & fuel pump, still has problem. All the sensors equal yamaha specs. I've also drained the tank and put in new fuel. Uggh!
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Old 08-24-2014, 08:01 PM   #2
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Joined: Feb 2004
Location: Tricities Washington
Oddometer: 1,811
Do you mean it runs but does not develop full power under 8000RPM?
Throwing things out is the wiring connected well throughout the spark system?
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Old 08-24-2014, 08:06 PM   #3
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Joined: Sep 2009
Oddometer: 6,906
Injector? Fuel filter? Fuel pressure, look for a bad hose inside the tank that leaks under pressure, tough to find, yeah.

On a side note, there will be someone along to let you know that WR450s never break.

Seriously, good luck. These bikes with F.I. are a bitch to diagnose.
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Old 08-24-2014, 08:13 PM   #4
Studly Adventurer
Joined: Jun 2011
Location: Northern California
Oddometer: 590
Throw the iridium plug in the trash and put the stocker back in.
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Old 08-24-2014, 08:30 PM   #5
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Joined: Oct 2007
Location: Central Wisconsin
Oddometer: 1,102

keep it under 8,000 rpm?

I really don't know, fuel filter?
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