xXPhasemanXx
Newb
you could use a die to cut some new threads on the crank
Thanks for that, I'll look into it

you could use a die to cut some new threads on the crank

Thanks for that, I'll look into it![]()
The bolt will then be a size smaller. Just remember that
and I don't want to be out $50 again 
Edit: Like this?
How is the Peg going on the crank in the first place?
1-The whole unit threads on?
2-The peg has a nut going through the middle of the unit threading onto the crank?
If #1, my question is... are the threads in the peg the same as the crank? This off hand seems that this is your problem.They are different threads and they mashed.
To fix it, ya you can chase the threads with a die, but you need the exact size thread die to do so, and knowing what size it is, should be your first step if you need a quick fix.
(You could even borrow one, or take the motor to a metal or car shop they would have one most likely.... if you know the size.)
Don't have anything like that here, I'm probably just going to go Home Depot, Rona, or Canadian Tire. Most likely Home Depot since it's closer to where I live and its where the guy in the video got all his stuff.
I like the design above because I can turn it into a pedal bike at the same time (Since the peg will turn all the time when it is on). Consider this, does the engine just turn on as you pedal? Or would I need to pull start it each time?
Edit: Bad news, looks like the weed eater I wanted was already sold and the person never removed their adBut I found another one for $40 and I won't be able to get it Saturday (Hopefully). But I'm going out to get all the parts that I need for this project later today. The weed eater I'm getting is a mcculloch 31cc.
if i were you i would stay away from home depot and stuff like that, you will be paying full retail and will be a lot more expensive

I'll look into it but I'm tight on cash. I'll try it with my bike peg for now (Since the hole isn't too much bigger than the bolt) and see how it goes. Thanks for the information though! If all goes wrong I'll look into it but I'm not sure if anyone in town does stuff like that.
I just went to the closest machine/engineering shop. They said it was the easiest job they had done in a long time. They just took a piece of 1" solid steel bar, and drilled and tapped it to the size I specified. They then knurled the outer surface to rough it up for better friction on the tyre
i would go chain driven because it would be more reliable, but im also confused about the ''friction system'', is it like a belt dive or am i wrong

Is it possible to just replace the engines bolt instead of re-threading it?
You will basically be replacing the whole crank then. The bolt/shaft is part of the crank, just like a normal engine