Again, for a nOOb I highly recommend a simple 49cc 4-stoke HS with 4G tranny complete kit to start with from like gasbike for ~$360 (thats what I buy) so you can make something you can ride in a couple of days and learn what all the parts do.
When you start with just an engine designed for another purpose you have to get creative and buy everything else piecemeal, and unlike those of us with all kinds of spare stuff around and good tools to make stuff you have to buy them or pay to have them made.
Just for a quick example of the last 2 days work on the 79cc Pred geared to the customer on his build topic on my site so he can follow progress...
---
I was told the 44T sprocket I had originally installed would be too small so we re-drilled a big nice aluminum 55T for a 9 bolt mount and got it installed. It turned out great, with our chain matching it may not need a tensioner at all but I'll put it on in case you do.
Since this engine is meant for something like a generator it has a manual throttle and a governor that limits max RPM to about 5400.
We don't need no stinking governors, you just have to be smart and not try to run it at 9800 RPM's for too long and burn it up ;-}
Nothing I found on the net was a simple solution to bypass all the stock throttle stuff and hook up a 1 1/2" pull 1/3 turn throttle cable so I came up with my own which is my favorite part of builds like this.
I simply removed the linkage and spring from the stock system so all I had was the throttles carb actuation tab on it.
That left finding a way to attach the throttle cable and there is a tab right there on the stock engine.
With the pull of the throttle cable and the range of motion for the carb arm hooked up direct would mean about a 1/10th of a turn of throttle from idle to wide open and that's no good.
The solution for full 1/3 throttle turn action was leverage on the carb arm so we used the 2 holes on the carb tab to attach our own longer plate at a 90 and our own spring as well as drilling out the engine mounted tab and installing an adjustable cable stay for the throttle cable.
This is the system at idle with the stock air cleaner on.
You don't even see a spring and the engines idle screw sets idle.
This is the throttle full pull 1.5" 1/3 turn which is full throttle on the carb so perfect.
In other news the custom exhaust pipe is made and waiting for the paint to dry, Pictures of it and the tank on by tomorrow as I can't dink around taking pics with work to do but Cole and I can't wait to fire this bad boy up and test it ;-}
---
These are the kinds of things you will need to do for everything no matter which way you spin it.