im doing a xs 400 tracker now, i like what your doing on yours im going to bore mine out as well. i put forks on from a xs650,rears from a xs1100.lengthend the swingarm 4 inches.next thing is dual front discs from a doner bike or aftermarket.im new on here so i hope to get some pics of it on here soon it will take all winter to make it. hope to watch your progress here.thanks for posting it.