if you've got one... not listed, let me know!

   notes:

        Suggested method: (Proceed at your own risk!)
Find a relatively deserted section of road. Cruise along in top gear at 20 MPH for about ten minutes or so. Pull over, get out and pull your spark plugs and look at them. Compare them to what they should look like. Write down on a chart what they look like. Repeat this test at 30 MPH, 40, 50, 60, 70, MPH (stay legal now... tickets are YOUR fault not mine). Record what the plugs look like.   Black or sooty, too rich. Gray to light brown, just right, white or ash covered, too lean. As an approximation, the three fattest section of the taper (called 'stations'), cover the idling to 10 MPH range. Thickness' 4-10 cover (non-linearly) 10-80 MPH and hard acceleration mixtures. 9 and up cover sustained wide open throttle.

       Now using the SUNeedle.exe* program, you can compare needle sizes to find the right taper profile that matches the ranges you need to correct. Read instructions for the program. It's not that hard to use. The link above, will download an executable that will un-archive itself into the directory where you store it after downloading. It's an old DOS program but runs fine under newer operating systems.

   Best of luck !                          

  * (The SU needle program has been stored locally on this site to facilitate ease of retrieval for more people. I do not claim any credit or responsibility for its development or use. It just happens to be one of the best tools found, to help in selecting needle types.  My sincere Kudos go out to the author of this fine program!)                     

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last edited 12/06/09