sorry I'm late on this, I just went through the same debate.
the reason i picked the honda was because of weight.
the yamaha was electric start and the added weight of the starter and battery was alot, and it cost extra to add a kickstarter.
yes I was worried about the boy being able to kick the honda over, but he starts it first kick every time!
and then I found a 2004 for $700 bucks, so that helped alot!
good luck!