The last month or so of riding, it’s becoming harder to start the bike. Three weeks agao I was riding, cruising at 60km/h I started loosing power. At the red light, it completely lost power. Somehow I started it again, and again at the next stop. Then I wasn’t so lucky, the old horse completely died. But no problem, I wanted to leave it in the garage that day anyway. Too bad I had to push it for 2 km. I know the bike has gas. Also pushing the bike and starting on second gear didn’t work. Also couldn’t fire it up with the kick start. I hear the ignition, and the exhaust puffing a bit, but the bike won't fireup.

Any ideas what to look for? The dealer isn't too far, but would be nice if I could fix it by myself or ride the bike there instead of having to push it for another 2 km.
I'll be back in 10 days. By then, the bike would have been sitting for almost a month, with almost 3 liters of fuel in the tank. I forgot to disconnect the fuel pipe...

Merry Christmas!