Actually , GT-750s are fairly Mildly Ported and have Red-line at 6750 rpm . No Bridged Exhaust Ports or Spot-welded Crank . These are not 10,000 rpm screamers . That runs WELL harder than stock though . I used to have one with Rick Roberts Chambers . Sure , you COULD do all the Stuff to get 120hp plus . But it would lose its rideability . Frame wouldn't take it either .