My WR ran a big end...Doh... I suspect water swallowed somewhere or even dirt through the filter or even oil pump failure... but... now im sitting with a couple of idea's in my head. I love my 450... but I would like a little less maintenance too. I dont use it for racing, so mainly outriding ect. I thought about a 660/700Raptor motor they have awesome wheel buckling torque, but I also think it can be expensive. Other engine's could boil down to the TTR600/XT600E/XTZ660 Tenere So what about making the bike less racey, maybe lowering the Compression, adding more oil and so on? Otherwise, im going to redo everyhting, ceramic coat most of the internals and just expect another rebuild in 6000miles.