Your right on few things. 1. The centrifugal clutch pull rope for 2 stroke always breaks within first 10 pulls so not even worth judging it vs a 4 stroke.
You're combining 2 separate items there. The centrifugal clutch goes on the clutch side of the motor and the pull start goes on the magneto side. I cannot disagree that the pull starts are typically complete garbage and if you manage to get a good one you'll end up breaking off the magneto side of the crankshaft. The beauty of the centrifugal clutch kit for the 2 strokes is that it has an internal sprag gear that allows for pedal starting so the only real need for a pull start is when you convert it to a scooter by disabling the pedal drive train.
Deleting the pedal chain is cool and all but in many areas in the US that immediately removes it from the motor-assisted bike classification and it's becomes a motor scooter which has its own set of requirements (license, sometimes insurance, sometimes registration) which kind of defeats the purpose. Now I'm not saying it's not cool, or that it wouldn't be fun to ride, I'm just saying that it takes away many of the privileges that you get by being a "non-motorized vehicle" like bike lanes, bike paths, driving without a license, etc. Chances are that isn't an issue for you, which is awesome, but for many of us this is a serious concern.
Didn't realize you were referencing an actual bike frame when you said occ chopper, I figured it was a reference to the general style of the orange county choppers motorcycle company and not referring to the Schwinn Stingray that comes with OCC decals. In your case, it was totally cheaper and easier to mount a 4 stroke vs a 2 stroke. Those frames are all but made with a 4 stroke conversion in mind. When I'm done dealing with my legal BS, I'm planning on building a predator 212 bike off of that type of frame. However, I'd bet 90% or more of people building MBs can use the included 2-stroke hardware to mount their motors which makes the cheaper 2-stroke kits the more affordable option. Not to mention installation is a touch easier with not having to swap out to a wider crank set or mess with a transmission.
They both have their places in the world and one isn't truly better than the other in every way. I may have been too broad in my assertion that a 66cc is superior, my bias from owning one is clearly showing haha. A 4-stroke may be a bit heavier, more complicated, and a lower peak hp but there is no denying that they are far more reliable, easier to use on a day to day basis and have usable power across most of the powerband to make up for the lower peak hp. Plus 4-strokes typically have more torque which is a huge plus if you don't live in flat area.
Either way, your bike looks good and if it makes you happy that's all that really matters.
but then again, maybe I'm spoiled by 5ish HP and 40+ mph speeds.
