I did a motard conversion on my 2000 XR650R early last year, and have ridden it quite a bit on the street including a couple trips down to Deal's Gap. I flogged it pretty good, and never had any issues, even running upwards of 110mph. Well, I took the bike to a trackday at Grattan last week, and it lasted three sessions before giving up. It started losing power, then finally shut down and was harder than hell to kick. I finally got around to tearing the top end down today, and this is what I found: http://www.rc30.us/xr2.html Lots of brass/bronze inside the jug, and the wrist pin and rod are fubar. After searching several threads, I'm pretty sure the crank is also shot. At this point, I'm trying to figure out what my options are. The crank is bad, and the cylinder is scored, so I know it's going to take quite a bit just to get it back where it was (stock bore/piston/cam/carb, aftermarket exhaust), or now I have the opportunity to build it up. I need to do something with the crank and cylinder anyway, so I'm looking for suggestions from someone who has built one of these motors for roadracing use. I'm saying roadracing instead of motard because there's really no dirt sections involved, and the bike will be ridden on regular road courses. I'm just trying to figure out what the cost difference is going to be between just fixing it as is, or going to 680 with a cam, possibly headwork too. I'm not racing the bike, just doing trackdays and beating it to death (obviously) on the street. The only problems I see with going to a built motor, is whether or not the pipe and carb I have are enough, and also are the stock radiators enough? Where does it all end!!!