Hey! Been quite awhile!! I got a wr400 for $300 (AUD) last weekend. Seized crank/rod bearing. Piston/valves and everything else seem in tact. So after spending all yesterday trying to remove all the thick carbon build up, I found a lot of pits/craters in the head - looks like these are from previous damage, not this current issue. Just trying to see any advice on this - leave or, maybe lightly try to sand them down or part the thing out? I'm happy to replace valves, piston and rod/bearings but not too much else. I have attached a quick before and after image. Thanks!!