Posted by Rick on October 25, 1999 at 13:55:52:
For those who want to use after market breather and open drag pipe, after you do the white spacer thing-Drill slide lift holes with #38 bit. Remove spring under needle and replace with nylon bushing. Install #55 primary jet. Raise main 5 points.Put needle in drillpress and machine .005 off while maintaining taper. I've run 16000 miles like this. You'll have a 300 lb sportster eater. Now hunt for taller gears it'll be screaming @100 mph. 2nd gear burnouts are easy to do.