Originally Posted by Orange Aero
I am putting V&H Longshots on my '99 1100 Aero. Obviously getting the V&H Jet Kit and also the K&N Air Filter to increase air flow. Question:
Is the air filter enough to keep the bike from running rich or should I look into an increasing the intake?
The K&N air filter will increase air flow, but proper jetting is what will make the power with your new pipes. When you put on the new exhaust and the new filter, your bike will be way lean, not rich.
Larger (#45) idle jets and shimming the needles on your vacuum pistons should do the trick. Re-jetting the mains and new needles (that is what comes in a re-jet kit) can help, but is usually unneeded if the idle jets are made larger and the needles are shimmed. The re-jet kit will not
include larger idle jets, which you should get to stop the popping on deceleration you will
get when you put on the new pipes.
It is way cheaper to do the idle jets and the needle shimming then to do a jet kit and will get you 99% of the way there. Been there, done that.