I've been watching all the mods folks are doing to the CRF 50's and then all the knock off motors and mods that are out now for them. I've seen some 110cc knock off engines at online auctions for cheap with all the mods already done. My question is this, are the 90cc engines in the Sportrax 90 the same engines that they use in the motorcycles and would all these hop up parts fit on the TRX. If they do, it would seem the TRX 90 would be a hot little thumper to trick out. Any ideas on this? (Before I dump a bunch of money into modding one of my LT80's for older son)

 

from what i can tell, the top end (head and cyl) are knock-offs of the trx90. i'm gonna rip my 110 apart this weekend to see really how identical they are. hopefully cams, etc will cross over. exhaust might work on the front end, but need some mods to get it to fit the frame. i've got a big gun on the way to see if i can make it work.

the rest of the machine looks raptor/badger-ish, like the electric start, reverse (?), and shaft drive. fortunately they dropped the yamaha's goofy front suspension and went with single a-arms.

they may not be very good mx machines due to weight, but i'm thinking pretty decent for hare-scramble.