Question about 2005 Honda CRF 450 R

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After complete dissassembly and cleaning of

06 CRF 450 R. After complete dissassembly and cleaning of carbuerator, at 3/4 to full throttle, the throttle will stick. When bike is off, throttle linkage is smooth throughout full range (no kinks, frays, noticeable mechanical issues, etc..). Return springs, throttle body, etc.. all seem to be functioning properly. This hesitation or sticking only occurs when bike is running and occurs somewhere around midrange to full throttle operation. It's as if there is too much air passing through the carb and the slide can't return to idle. Checked for leaks, etc... Any thoughts?

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Try taking the return spring out and give it about an additional one inch of length by gently stretching it out. Over time, the spring can loose some of its original tension.
Even the smallest debris particle can cause the throttle slide to hang up. If it isn't foreign matter causing it to stick, then there could be a ding or gouge in either the slide or the carburetor body. Take the slide out and put some blue machinists dye on it, then slide it up and down inside the carb - this will show you where any high spots are. Carefully remove the high spots with 1,500 grit wet or dry sandpaper.

Posted on Nov 17, 2009


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I would be checking the size of main jet (they numbered) double check it is factory size? I would check the needle clip position god knows why but people change the position so double check it is factory setting (usually 3 or 4 notches from top is factory setting I forget which one it is for Honda's) I would double check your air filter is clean and/or not oil drenched
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