The PJ circuit has 2 main objectives:
- 1. To richen the mixture at predetermined (by the PGM?) engine speeds/throttle openings
- 2. To provide fuel to the crankcase on over-run during closed throttle situations
We also think that on a stock bike the PJs are used for extra top-end fuelling, thereby allowing the use of a smaller MJ and consequently more control with the JN, of the mid-range fuelling. On a stock setup the MJ acts almost like a "mid-range" jet, and the PJs like a top-end "booster" jet in conjunction with the MJ.
The HRC/Jha kits blank off the PJs and so as I see it, the X and Y pieces act instead as a secondry air bleed. The HRC and stock X and Y pieces are significantly different enough to make major adverse changes to the jetting process, so therefore you will need to make your own conclusions how to best try and integrate them in to a non HRC/Jha specified setup as they were never intended for this purpose.
Hope this helps.
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Andy.
NSR-WORLD.COM
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Last edited by Andy on Fri May 20, 2005 9:49 am; edited 1 time in total