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Old 09-03-2010 | 09:45 AM
  #20  
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Ambros303
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Weird, haven't seen a Force .28 with midrange (B) needle before...maybe it's an older (or newer) version.

Normally it has a LSN (D)
HSN (A)
and idle screw (C)

The location of the B needle would suggest it is a midrange needle. Usually they are best left alone unless you know what your doing. For tuning you use the LSN for engine pic up and low revs and HSN for full throttle setting. Idle screw is for setting the idle gap (usually between 0.5 and 1mm)
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