Looking for advice on purchase
New members here. Me and my cousin are both building motorized mountain bikes this fall/winter. We live in Davenport, Iowa. And both are 5'8" and 140lbs. Been riding BMX, and motoX all our lives.
We plan on modifying our bikes, porting, exhaust, intake etc and some custom parts from local CNC shops, possibly a shift kit etc.
Wanting reliability and a bike that can cruise at 30mph+ easily for extended periods of time.
What engine do you recommend we each buy? 66cc or 80cc? Skyhawk? Links are welcome.