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Old 05-30-2019, 10:34 PM
jully6896's Avatar
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Default 2005 crf450r hard to start when hot

     

Hello everybody, Hoping y'all can help me out. Just rebuilt a 05 crf450r with a big bore and stroker kit +4mm on both and it seems to be running really good. starts super easy when cold, but than its really hard to start when its hot. I checked the valves and there within spec. thinking it might be something jetting wise but not really sure. I guess if somebody has done a big bore and stroke (+4) did you have to rejet and if so what did ya have to put in. Also I know its kinda a double wammy but we also have a 07 crf250r that will idle super hi after riding then you turn the idle down it will dy out slowly, it doesn't like starting without the idle turn up either. Any help y'all can give is much appreciated, Thanks in advance.
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Old 06-01-2019, 07:12 PM
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I suspect you may be a little on the rich side. They like to be rich when started cold, but leaner when started hot. Adjust fuel screw and rejet if necessary.
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Old 06-07-2019, 10:51 AM
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Quote:
Originally Posted by gusco View Post
I suspect you may be a little on the rich side. They like to be rich when started cold, but leaner when started hot. Adjust fuel screw and rejet if necessary.
This. And make sure your hot start lever is working properly. My 03 450 won't start without it if I dump it. Your 250 sounds like jetting too, and possibly a dirty carb. Give it a good clean and make sure jetting is spec'd for your altitude.
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Old 06-08-2019, 12:25 PM
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Your fuel screw is out of adjustment on the 450.

Paw Paw
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