I can't see the pipe well enough to tell. It's not a ::Trinity,Hetrick,ATV Racing,or CT.
I thought it was a DG but the silencer seems way long for that.
Maybe: LRD, FMF, Pro-Circiut.(SP)..
Look in the area of the front sprocket and where the rear end bolts to the cases. Cases break there.
Look under the machine where the frame rails tie together. Set down and look at the 2 down posts on the frame in the lower air box/carb area. Frames break there.
It looks like a nice machine
My 2 cents,,, If you think that your son won't like riding, is rather meek and mild, and will rarely have the machine at full speed (28 or so). Buy that one.
"IF" your son loves to ride, likes to rip and tear (like I'm thinking dad does), consider hymis' quad.
It'd make a great machine for the dunes, MX, trails or just in the back yard.
AHHH let's face it, you and the kid is going to love it all and you'll be spending that much or more to get the same in the long run..This ones tuned and ready to unleash Moore Power for your kid!!