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excalibur174

CRF250R 2009 jetting problems

6 posts in this topic

Hello

My buddies got a Crf250R 2009 with a pro circuit pipe on it and he's having jetting problems. He says its bogging on certain big jumps. Does anyone have some jetting set ups that have worked with the pro circuit pipe?

thanks

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procircuit has jetting specs on there website that might be helpful.

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Did the 09 still have the 'fuel sloshing away from the main jet on hard landings' problem. I'm only mentioning this so he doesn't get to fat on the main to compensate for another problem, a rob himself of needed hp.

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Did the 09 still have the 'fuel sloshing away from the main jet on hard landings' problem. I'm only mentioning this so he doesn't get to fat on the main to compensate for another problem, a rob himself of needed hp.

this was my first thought as well, dont remember who makes the new bowls off the top of my head?

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R&d makes the bowls and this helps i had some local fast a riders with the same problem they were increasing main jet size to huge numbers to compensate like a 188-190 and yes that will hurt the power a bit .the velocity in the port is to low for good engine rpm recovery as soon as they put an RHC ported head on the problem went away because of the increased velocity also the carb on the 06-09 bikes is just to big in the venturi they actuall will make more power with a specialy bored 37 mm carb with a 39 mm venturi and they will regain rpms much quiker.

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