More compression, more advance, leaner jetting = more power Without any of the above its a waste of money and on the street its kind of unpractical.
_________________
1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike