Which jets do I have??

[radchad3]

Hi all, have a quick question. I have been having some trouble adjusting my carb. I have a 2001 400ex with white brothers exhaust, K & N filter and full air box lid. I have been trying different jets but the dealer keeps giving my jets with different things on them. One jet says 155RD and the other has a 155 with a star. Is the 155RD a dyno jet and the one with the star a Kehein? Any thoughts? Thanks for your input!! Chad

Also does this sound like about the right size jet? (live in Nebraska)

[NCexRider]

That's a k, not a star, and it is keihin. Don't know about the other one, but it's not a Dynojet jet with RD on it, they say DJ.

[GPracer2500]

The jet with RD is made by RD Precision. They are copycats of Keihin jets.

[radchad3]

Oops...better get my eyes checked! I thought it was a star. Does the RD jets match up number for number with the Keheins? It seems that the 155RD has a bigger inside diameter! Any thoughts? Thanks for the info so far! Chad

[GPracer2500]

AFAIK, RD jets are suppose to be identical to Keihin. Even so, my personal preference is to always use Keihin factory jets.