I have seen this done, its very possible, but you will need to install a Rincon motor or larger bike motor to turn the wheels good. You will need to build a box frame to link the wide track wheels with the stock bike fram. some people just build all new frames around the engine as well, and then just sit the body parts over it.
I wouldn't do it
the Honda fourtrax 300 is built perffectly from the factory they go any where and u can abuse thee he'll out of them withoout the breakin
I'm a 17year old kid and I'm pretty abuseive on my quads but nomatter what I do to my fourtrax I can't kill it
liftin it would be totaly pointless