I see what you guys mean by these things being addictive

[rel3rd]

Well, I do have two questions...
The Rupp has to go...not enough time or patience for that one.
so....

1. Which one would make the best Predator swap candidate?
Or is it a toss up?

2. Will a 5hp horizontal shaft B&S generator engine work on a minibike?
Assuming the throttle is addressed, and it bolts on, which it looks like it will

 

[Daniel Coop]

They're both in need of that swap and nearly Identical in the way the motor will fit. Pick which one to do first. The 5HP Briggs will work, but I think a newer Chinese bike needs a newer Chinese OHV 6.5-7HP. Stick the Briggs in the Rupp and sell it together for max profit. In my humble opinion

 

[rel3rd]

They're both in need of that swap and nearly Identical in the way the motor will fit. Pick which one to do first. The 5HP Briggs will work, but I think a newer Chinese bike needs a newer Chinese OHV 6.5-7HP. Stick the Briggs in the Rupp and sell it together for max profit. In my humble opinion

Hmmm...didn't even consider the Briggs in the Rupp option...You may be onto something.