Hey guys - New user here and I thought I'd make my introduction. I bought a 00 WR400F a few weeks ago.. $800 and it came with a full Tusk road lighting kit and even a set of dual sport tires, combined for a value of ~$400. So I figure I was getting an awesome deal - basically $400 for a pretty cool bike that came with extras. Test drove it around the kids block, liked it and brought it home. I didn't even think twice when I pulled up and he was putting in coolant. It started up first kick.. So I get it home and tear it around the block once... short ride. Park it and start putting on the lighting kit that night. Intended to take it to the trails within 2 days and see how it felt.. Night before, I see a white "liquid" dripping from the shifter side above an oil fitting. Drain the oil to find myself a milkshake and then open the radiator cap to find little or no coolant.So I do some reading on here and get my hopes up its just a water pump needs rebuilding. I pull the motor and send it over to a friend who I bought a 99' CR250R from a few years back who would rebuild all his own power equipment motors and such. I trust him and he's pretty good at it. I order new gasket kit, waterpump kit, oil seals, crank bearings and counter balancer shaft bearings. New clutch basket and clutches cause the old one fell apart upon removal... I'm somewhere in the area of $500 on this motor rebuild.. Now to my final point and question.... The cylinder has a hairline crack by the water jacket and so far the bottom end seems to be in ok condition. I'd like to keep and run the bike and register it and have myself a cool dual sport.. Is it worth it and what are my options? New/used jug? Big bore? Tell me something I would like to hear.