Have a 2001 Sportster XL with 8k miles. Starts and idles fine but after riding 15-20 minutes, begins to misfire intermittantly at take-off and between gears. Sometimes does it and sometimes does not. Changed plugs, wires, coil and fuel valve and filter. Appreciate suggestions. Thanks.

 

Welcome, and heck of a first post. Try posting in the sportster section

 

Pull your carb and clean it. Also make sure your intake bolts are tight.

 

A scooter with that many years, I say check the intake gasket, it might need to be replaced.

 

+1, I'd replace the intake gasket that the carb seats in and the gaskets that seal the intake to the heads.