I was out for a ride today and ran into a problem. Here are the details: Background * Stock engine internals * Engine maintenance (oil / filter cleaning, new coolant, air filter cleaning) * Two three hour rides since above maintenance (today was the third ride) * I change the oil / filter and air filter every three rides * Previous two rides had no problems/leaks and bike ran great Today * Rode fine for a while. * Idle was at 2100rpm at the beginning of the day. * I have a tach and set/check it every ride and put at 1900 rpm...usually no need to adust. * I stalled the bike twice which hasn't happened in a while (Rekluse clutch)...of course could be operator error:smirk: * About two hours of riding a mix of single track and high sped washes the bike started running poorly. * Engine would stall easily * I checked the clutch lever side of the bike to see if the pilot screw had somehow moved and made sure the fuel flow was fine - OK * Ride over and headed back to the truck * I did not check the other side of the bike. * About 1-2 miles from the truck, I heard the engine pinging a little only while rolling on the throttle. * Created some new swear words. * When I got back and rolled up on the trailer, the right side of the bike (grr...the side I did not check) was covered in oil. * The skid plate was driping with oil, the tire, rear rotor cover, shock spring sock, and shock linkage were alo covered with oil. * Checked the oil level and it was 3-4mm below the low mark on the dipstick. When I got home I removed the skid plate and cleaned off all the oil. My best guess is that it was coming from the crank case vent tube since there were fresh drips. I added 6oz of oil which brought it to the low level of the dipstick. I then went around the block to try to find the oil leak with no luck...granted no WFO like in the trails. My thoughts Two previous rides with no oil leak probably means the oil was not overfilled. I use a ratio rite and the manual to measure accurately the amount going in and drain both the tank and sump. Yeah, high rpms can cause it too but nothing abnormal today. It certainly didn't seem like blow-by as if the rings were junk. I'm stumped. No leaks around the case either. Taking all guesses out of the problem, the symptoms are that it stalled easily (when grabbing the clutch or stabbing the rear brake - would low oil with a Rekluse cause this indepenent of the problem?), it pinged/spark knocked at the end of the ride, and idle had to be at say 2300rpm not to stall easily, 3-4mm low on the dipstick, and oil everywhere. Any help would be greatly appreciated. Heh - Now looks like a good time to get my boots resoled so I have the time to fix this. I want to fix it correctly. Thanks.