Re: Prep for a new motor??
Most everyone needs to change out the clutch handle first thing before the darn thing will work at all. Mine never worked from day one, A simple brake lever will work if you don't want to go for the fancy locking clutch one.
If you aren't ham handed like me you probably won't need a different throttle. I broke mine on day one trying to start an engine I had assembled wrong.
Other than those an the plug wire, I'm not sure I would do anything different from the kit.
My posts have entertainment value only. A bike ain't yours till it has your blood on it. Then it owns you.