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Join Date: Sep 2005
MikeyMike, The concensus around here is that you don't have to rejet when putting on the V&H - but I can tell you from the dirt bike world that when you swap a choked up oem exhaust for a straight-thru pipe you always benefit by adjusting the jetting. By more efficiently removing the burnt exhaust, you can usually go a step richer on the main jet.
If the K&N's really flow as well as advertised, you will need to jet richer. I'm still all stock and my sparkplugs are pure white - indicating that I'm already too lean. If your plugs are also white, then you will most likely benefit from richening up the main and pilot.
Plus, your bike will run cooler with richer jetting.
Please let us know what you end up doing. I have the V&H and K&N yet to be installed so it would be nice to have a reference.