I own a 98 yamaha timberwolf 250 4x4. its a good machine in first gear in the mud but you need to "slip" the auto clutch with your foot to make it work. i added a K&N airfilter, with a slip on exhaust. i have 23" dirt devil tires on it. i realize they ar ea bit too aggressive for this machine. what in the world can i do to this machine to make it have a little more oomph to spin the tires??? i just had a new piston put in. i dont think it was bored out or anything. it may have been. im just looking for some suggestions. possibly a cam, or big bore kit that might be worth the money? anyone have one of these with better than stock power? thanks!