I am aware that the 4 has less peak hp than the 2 but the power band is much wider. But I get the whole engine plus mik carb, plus no more premix, cdi, plus cheap kits. So maybe it won't do 80, but it would prolly jump off the line just as it would jump from 30-40, and be hard to stop.
This is all inspired by my latest attempts to seal my bing carb and my e50 head. Sealed fine, but 5 miles up the road, permatex bits got in my jet and almost caused seizure, 3rd time it's done this, and 50th time I've had to reseal, and I'm kinda sick of my dated leaky motor. Crank seals are going too, I can do a $300 rebuild with kit, and hope to hit 47, or I can strengthen my frame in some creative way, and add a $200 complete new powerplant. I saw a puny 4-stroke minibike that ripped like shit the other day, and I felt owned, guy was riding wheelies at 30+, and could burn out at 10+, bike was insane, it topped at 65.
I have two moped goals, 1) to climb 35+ mph continuous to the town of Nederland from Boulder, up the canyon; 2) Flee from a cop and actually smoke 'im, and escape, leaving the officer to try to explain to his superiors how he lost a guy on a moped. (ok now I'm just dreamin :-).
If goal #1 would hit 60 on flats too, I'de be in heaven. I'm wondering if this engine might do that, in my hands. But it must have pedals still, and be able to pass for a moped, upon casual observation.