Bought a Honda xr600r in mint condition 2 weeks ago... It ran pretty good and lots of things have been replaced by the previous owner. Drove it home, about 130km on the highway, about 90-110 km/h. It ran great, and the massive torque made me very happy. During the next week I heared a *clunk* once, but didn't pay much attention to it as it was still running good. My shift mechanism became stuck, could loose it up by gently tapping on the shift pedal. When I was moving the bike to my garage, rolling it forward in gear with the cluch in, I heared a grinding noise. Thats when I decided to take it appart. Then I found this: Here we go again, i've never purchased a vehicle which didn't need a rebuild... -I think the piston needs changing... -Crankshaft is blue around the bigend. I can't feel any play though... What should I do with it? -Small-end looks ok, but has copper-colored parts... Replace or not? -Camshaft middle bearing look ok. I don't *feel* any damage, but you can see a mark.. -Nicasil plating is scratched a bit. Not even too bad considering the piston.. It looks like this cilinder has an aluminium sleeve. There are wiseco sleeves for the Nicasil plated cilinders on ebay...? Are these wiseco sleeves alu sleeve's or cast iron? And do they have nikasil plating? How can you put a sleeve in an 88-90 nikasil cilinder? -One camshaftlobe is damaged. Altough it doesn't look very bad, (it is smooth) it is about 2mm lower then the other lobes... I'm never going to buy a *fully rebuild* engine again.. Kind of amazing that the bike still ran pretty good and started first kick... damn this could have locked the rear wheel and cause some serious accidents..