Recently I discovered white milky oil spewing from my LC4 400 and noticed my coolant levels running very low. After researching, I rebuilt the water pump and discovered what looked like a bad seal, replaced it and changed the oil 5 times until it ran clear. I did not adjust the valves when I did the repair b/c I did not have the proper gauges (they do make noise, but the same noise before and after the repair). After the repair, the bike seemed great, so I went on to fine tune the aftermarket FCR carb to my 7000 foot elevation. I replaced the stock 170 main jet with a 162 and changed the pilot from a 48 to a 45. The bike ran pretty good with a much better low end and not necessarily any difference in the high end. I also added stainless oil filters to the bike at this time. The air box is open and it has a Big Gun exhaust. I loaned it to a friend to ride on an 80 mile dual sport ride yesterday and as he was nearing completion of the ride on a long 60mph street uphill in 80 degree heat the bike just stopped running and spewed out most of its oil (everything still turns fine - no seizing). The seals on the engine seem intact and the clear plastic tube that drains from the frame got blown off causing oil to cover the engine suspension, etc... the oil is fairly brown and clear and does not look like the milky mess I experienced before the water pump fix. There is little or no coolant in my radiator, however, I cant find any obvious leaks in the cooling system. Argh! Suggestions?