What do you get when you ask a dirt bike riding engineer how to tune a Keihin carburetor?

THE ORIGINAL JAMES DEAN (JD) JETTING GUIDE! Use your own bikes’ jetting to graph and compare. See the combined effects of pilot, needle, clip position, and main jet. See the changes needed for altitude and temperature variations. Now with up to 5 possible settings compared. New: Slide cutaway effects More needle options with hard to find part numbers. System Requirements: PC or Macintosh running Microsoft Excel NOTE: Microsoft Excel must allow the use of “sheets”

Click here to veiw more graphs

James Dean designed the JDJetting kits so that you don't have to be an expert to get professional high performance results!! Even better, technical support is provided.

Here is what some Riders/customers say:

"We installed the 3000-6000 ft kit on our KTM 450 EXC . and found it to be an ideal setup ." Dirt Bike, August 2004

Mike Burkhart Supermoto #61 added the JDJetting kit to his recipe for building a front-running Supermoto racer, " the carb is jetted with James Dean parts " American Motorcyclist July 2004

MXOffroad.com Project 525 EXC ".the kit was definitely worth the investment . It made the 525 come alive much more than I had hoped for. I now have a much more responsive bike with incredible power that still maintains good fuel economy..With the needles, jets and easy to follow detailed instructions for altitude and temperature adjustments this kit gets my thumbs up."

ThumperTalk.com, jph21 says, "I thought the instructions provided were self-explanatory and very informative. This J.D. kit is the best bang-for-buck I've spent on any mods done to my bike. Buy it, you won't regret it!"

ThumperTalk.com, ulmanb says, "After installing, now I know what everyone meant. It is like a totally different bike. Revs faster and a lot more responsive. Best $$ I have spent on the bike ."

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