JD jet kits rock

I just wanted everyone to know that the James Dean jet kit rocks. I installed one on my 04 yz450f with a Pro Ciruit Low-Boy Ti system, followed the directions and in return the bike starts on the first kick 97% of the time, runs much smoother through the midrange, is way more crisp, and feels like it pulls harder up top. Thanks James Dean!

Thanks for posting your results,

James :cry:

Hi James.

I have your kit in my '01 400SX and absolutely love it. The bike runs perfect.

My buddies '03 YZF450, on the other hand, does not. I rode it yesterday and could barely stand it. It sputters really, really bad off the bottom and the hit after it builds RPMs is brutal. I know the '03 was a bit too much from the factory, but it seems like maybe your kit would smooth it out a bit. What do you think? Might make for a good early Christmas present.

The bike is totally stock and we ride at about 500 ft. in the AZ desert.


The kit would help smooth the power and add response if there aren't other problems. It could be the fuel screw or clip position is too rich in his case.


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