I bought a '97 CR250R in May from someone who had just rebuilt the engine. The bike has both burnt and leaked crankcase oil like a pig ever since I got it. I just got around to splitting the cases to find out what the problem was, and it became obvious that the previous owner had pried the cases apart with screwdrivers and a hammer (notice in the pictures I used a Tusk crankcase splitter). Some of the screwdriver gouges in the sealing surfaces are pretty severe. I'm looking for advice on how to repair this. The previous owner apparently tried to help the Honda gasket out with lots of silicone sealant, but that didn't work. What about JB Weld? Machine work and an extra gasket? Welding? I enjoy riding the bike, and appreciate any information from someone who has fixed this before!