I can't help with that problem, but, I've had the same machine since April. Did my first oil change with a filter I ordered from the Motorcycle Doctor. Worked great but figured there had to be one I could get locally. Checked the other day and found water in my oil. Drained it but didn't change the filter. I cleared up quite a bit so I changed it again and did the filter also. Found that a Purolator L14215 oil filter from Tractor Supply fits perfectly.
I think the water is condensation in the motor from not letting it warm up enough. The water bottle and radiator hasn't lost any fluid at all. Too many short trips and not letting it get hot enough.
Good luck on your problem and don't forget to let us know what you find. I've had mine attached to a battery tender junior since it got cold here.
Bob