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CRF 450 x having a few problems

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My mate at work is having a few dramas with his CRF 450x as my bike is a R i dont have a clue how to sort it so i'll post the problems and anybody who has got any suggestions it would help a lot .

Its a CRF 450 x 2009 model

JD jetting kit with red needle

RND quickshot

air box cut open

and the standard muffler opend up

At low to middle rev range it will back fire and run rough and crackle , it will stall when u roll the throttle off going up hills . it will also stall when u go from hard throttle to no throttle .

Thank you for your time .

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...and after that it sounds like you may need to increase the main jet size.

Size is primarily dependent on elevation and secondary to atmospheric conditions.

For average Aussie elevations, maybe start somewhere around the 165 to 168 range.

Slightly more perhaps if you are in warm and dry conditions.

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...and after that it sounds like you may need to increase the main jet size.

Size is primarily dependent on elevation and secondary to atmospheric conditions.

For average Aussie elevations, maybe start somewhere around the 165 to 168 range.

Slightly more perhaps if you are in warm and dry conditions.

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