Hi all, I'm coming to grips with the fact that my big end died, I have ordered a new Stock crank, and a Cylinder Works 434 BB kit...while I was replacing stuff (whole crank cheaper than rebuilding the orig in Aus) I might as well upgrade... Anyhow, I'm preparing to put this bike back together, I bought it second hand from a local bike shop and had problems from day 1, it went back and had new cylinder, piston etc before I'd had it for an hour, which was devastating I couldn't get my money back unfortunately, I certainly tried, and I suspect that the big end damage was there before I bought it, but...I'm not sure. I don't know what's caused it, I have read that if the o-ring is missing from behind the filter, this can cause probs, or maybe the bike ran without oil once upon a time? The o-ring was missing when I tore the engine down, unfortunately I usually assume things are right when I pull them apart and put them back how I found it, so I suspect the o-ring was never there since I've had the bike as I've changed the oil a couple of times a year since I've had it, so it's probably had an oil chance about every 500k (ridden about 2000km) So my questions are: Anybody know what could have killed my big-end; and How do I test my oil pump??