I just replaced the rings on my Dommi. The cylinder did not look worn. I was doing 130 km/h and noticed oil coming out at the top of the petrol cap. I slowed down to 100km/h and it stopped. The little reservoir in the breathing system had quite a bit of oil in it. Last year during a severe thunderstorm I got water in the crankcase down the breather pipe. Is there a valve on the pipe? Any ideas for these issues?