hey ken, are you saying one should not port a stock cylinder at all? I'm just looking to take a hi torque maxi to 40 with good takeoff, have it run reliably, and have it run like it's does now at 30mph. No interest in pushing the speed envelope like all these 50 mph insaniacs. Too old! There's got to be a way cheaper and more reliable way to do it than buying an $85 kit, $100 crank, and $100 pipe.