I am currently in Canada and my bike has sat out in some cold weather over the past few days. However my problem started after the first night out when the temperature dropped below 0ºC.
Before leaving France I replaced valves and guides and obviously put on a new head gasket. I then drove some 1200+ Kms locally and through France to London with no issues.
When I retrieved the bike in Halifax, I decided to change the oil and filter before starting out. I only ran it for a short time to circulate the new oil. Next morning, I went out to find the front of the engine from head gasket down and over the filter housing covered in this new oil. Having checked everything I could think of, I started up and all seemed well, so I did a short test run. All still well, so I decided to go.
Now, maybe 1800 kms later, I have a leak at the head gasket, and the bike has an uneven and variable idle.
So where might this oil have come from? Is it possible that the could have somehow damaged the head gasket??? Or have I just been unlucky/