Harbor Freight Predator 79cc 4 stroke shift kit build (reference)

[Will'smotobikes19]

Yeah it's pretty cool that guy got 50mph out of a 79cc engine that's crazy though and I don't even think he had disc brakes.

 

[KCvale]

If this is true, then my 65lb (soon to be 50lbs) will be able to hit 75 easy, because i will be able to utilize all of my gears to the max.

I think you will find that wind resistance prevent 75, besides you just don't want to go THAT fast on bicycle!

 

[Marcus Mitchell]

I think you will find that wind resistance prevent 75, besides you just don't want to go THAT fast on bicycle!

Yeah, the way my bike handles at 25mph is twitchy enough.

I'm using disc brakes as well, though I need to get a larger rotor in the front, cause rn, the rear puts more power in than the front. I'm also going to swap the current levers out for one finger levers, so when i can get a manual clutch for it, the brake lever goes less than halfway. Enough for grabbing the clutch and THEN the brake.

I still need to put an alternator on it, with better lights (the current ones have mounts that just let them flop around like a dead goat), better wiring and switches, and more room for accessories, such as heated grips!

 

[Cozmik Mezzenger]

For your build, you might consider upgrading your flywheel.