Just got my 80cc engine mounted to my Hardrock Specialized Trail-bike!
It was a bit challenging to put together, but it's all worth it. I did mess up on cutting the chain, so I had to order a new one, but thankfully my neighbor had a proper chain cutting tool that he uses for his Kawasaki.
I thought I did my wiring wrong since the engine wouldn't idle when I stopped, but then I realized I didn't screw-in my idle-pin, now the engine idles propeerly and the wiring is correctly done since the killswitch works.
I am absolutely loving this engine!