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Old 07-25-2014, 09:46 PM   #1
ApexMotorcycleWorks OP
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Joined: Jul 2014
Oddometer: 3
CRF450R Woes

I recently purchased a 2002 CRF450R and I can't get it to run right.

The problem is a dead spot in the throttle right on initial acceleration. Sometimes this dead spot occurs while on-throttle and cuts the acceleration.

It feels like the bike is running severely lean. It will idle but only if the set screw keeps the revs over 2000rpm. Anything less than that and it stalls.

I've tried re-jetting with a JD Jet kit and replaced the air filter with a new Uni that I freshly oiled. No noticeable change in the problem.

Any suggestions?

Thanks!!
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Old 07-26-2014, 03:40 AM   #2
1or2Cylinder
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Joined: Apr 2014
Location: Western Mass
Oddometer: 21
My 250 did the same thing when I first got it. The bike had sat for years. Disassemble your carb and clear all passages especially the cross drilled holes in the brass tube(s). After that I never had to touch the idle speed knob again. To prevent happening again, always shut off your fuel and run out of gas when storing. I do it every time I put it away. Welcome.
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Old 07-26-2014, 11:26 AM   #3
ApexMotorcycleWorks OP
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Joined: Jul 2014
Oddometer: 3
Thanks!

To clarify, the cross drilled holes in the brass tubes. Are you speaking of the Idle Jet or are there other cross drilled brass tubes I'm not aware of
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Old 07-28-2014, 07:16 PM   #4
ApexMotorcycleWorks OP
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Joined: Jul 2014
Oddometer: 3
Just seeing if there are any other opinions on this.

Thanks
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