The Original James Dean (JD) Jetting Guide!

With the James Dean (JD) Jetting Guide, you can 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 on any graph to view it larger

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.


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