i just bought a brand new 2012 dsx 90 for my son. he is 7 and is very disappointed with this machine!! absolutely no low end. apparently the good folks at can-am do not offer other sprockets but the stock 16/40. i am now going to try a front sprocket from a ds 70 that is a 15 tooth. i have also pulled the baffle out of the exhaust. is there any other things i can do to give this wheeler some more out of the hole without spending 500-1000? thank you in advance