Question about 2003 Harley Davidson FXST Softail Standard
If your bike is still equipped with the stock Keihen CV carb, there is an IDLE mxture screw but it is covered with an anti-tamper plug unless someone has removed it. If the anti-tamper plug has been removed, you turn the screw inward to lean the IDLE mixture, outward to richen the IDLE mixture. This screw only changes the IDLE mixture and has very little effect on the slow or high speed mixture. This mixture is controlled by jets inside the carb.
You didn't tell me why you wanted to know this information. If you are having a problem with the carb idling either too rich or too lean, you probably have something wrong with the carb that a simple turn of a screw is not going to remedy. The Keihen CV is a good carb and functions well when everything is right. I'm still running one on my 1994 FXDWG with over 30K miles on it and never has minute's trouble with it. If you're having a problem tell me what it is and maybe there's a simple solution for it.
Posted on Aug 23, 2010
Testimonial: "Hi the reason i thought about idal mix is that like many Harley riders mine backfires on the over run it was like poping but since i drilled out the b"
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Posted on Jan 02, 2017
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