Re: Ouch. Sucks for him...
These kits are dangerous, no doubt about it.
Gas leaking from petcocks that don't fit right. Gas that gushes out the tank if you fill it up all the way. Chain tensioners that rotate into the spokes and toss you over the bars. Less than clear instructions that vary from kit to kit. Frame adapters that come with the kits that instruct you to drill through the frame.
And yes, a motor that has much more power than your brakes.
And yes, the vendors suggest that you can simply bolt these on in 3 to 4 hours and be blazing down the road at 35.
Dangerous? You bet!
The only thing in my garage with 4 wheels is the lawnmower