anyone got any idea's for me

[ty08]

hey everyone i have a small project in mind i have a atv frame with no motor
don't know what type it is but i want to get a decent motor for it one that goes hard and has enough power for hard riding like jumping 4 wheel riding sorta stuff i was thinking of a 400cc motor of some sort i no how to weld and redesign many things im willing to cut n re-weld for engine mounting ans space work i need your ideas on what type of motor i should be buying and any tips im not interested in buying a new atv i rather buy a new/used motor and put it in and add a few adjustments

[carter.c@syban.net]

motor from a honda 250R? not too big not to small lots of power.