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Crf450 idles but won't rev

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Buy a carb rebuild kit or clean it very well. Also check the jetting for your area if you get the kit. Use brake cleaner ans compressed air. Do not use auto carb cleaner it will cause damage.

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^+1

 

Clean the carb very very well, make sure it is jetted correctly, your problem is most likely in the carb.

 

Have you done any work to the bike lately?  Check the accelerator pump diaphragm.

yes we put a new piston in it it ran perfect for 2 days. and we checked all valves  timing is spot on.

Edited by hilliskx713

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yes we put a new piston in it it ran perfect for 2 days. and we checked all valves  timing is spot on.

 

Check the timing, especially if you used that piece of shit OEM cam chain tensioner. What it really sounds like to me is it picked up a piece of dirt or whatever in the main jet. 

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