I put a street tire on my RM500 (air cooled, but ported agressively) and it was nearly unrideable! when the powerband hits, youre doing a wheelie if you want to or not, and if you dont shift fast enough, youre going to flip. Its possible to ride below the powerband, but your chances of fouling a plug are higher and its much harder on the crankshaft to lug it. It is the ULTIMATE hooligan bike. Good luck!
1968 Honda CB160 Racer, 1970 Honda CT70, 1971 Yamaha DT1, 1974 Honda CB125S, 1974 Yamaha RD350, 1984 Suzuki RM500, 2003 Suzuki DRZ400S