...... this is after 1000$ of parts, stroker crank, 80cc kit, carb, cam, big valve head, etc. etc. After you ............ at about 35-40 mph. Anything more will require a big bore kit honestly. The smooth boss is a HUGE ............ power, you might as well start researching what big bore kit you want to get, Zombie (where the heck ............ he?) always talked about performance package kits that come with everything to run 50mph with big ............ head, 80cc kit, cam, exhaust, carb etc. for about $500. (China ......