my little dude is 6. He's 62 lbs and 4 ft 3 in. (He's a big dude for his age). He is riding a 110 Burton Chopper right now. With your boy just starting out, I would keep it around 110-115. Also, I know it's weight that matters, but also, you really want the board to be right around if not under his chin (it's under the chin on my grom) anything bigger will make it hard for them to maneuver.
One thing about the Chopper, it's a great board for learning, but it has hardly any edge hold at all. My grom has struggled when making hard cuts/traverses. All depends on how aggressive the kids are going to be with their riding and what they wanna do.
Every turn is a blessing.
Last edited by dharmashred; 02-22-2010 at 04:50 PM.