Greets from Finland guys!
After long long winter, normal season start maitenances done, battery on its place, short cranking and all fine. Bike did work really fine, nothing but out and road. After first 200 km's and refueling. mr Murphy arrived...
When started bike in gas station, kaboom!
It seems like carbs have floated while filling tank. Since I started bike again, sounds like engine sneezed once... it blowed smoke from exhaust like in backfire, but also raised pressure in cam chamber a lot and immediately pushed oily smoke like there was spilled oil to hot exhaust manifold....
Any new noises from engine can't be hear, it idles nice, no power loss, engine runs fine up to top rpms BUT leaks oil now somewhere from engine left side....

Have anyone experience about something like this??

My understanding will end to ignition point...
If cylinder is filled with gasoline, shouldn't it broke cam shaft or something quite easily?
If cylinder head gasget will brake down, should't it reflect to engine behaviour some way. I didn't notice any abnormal in engine temperature and like I mentioned, engine seemed to work fine...except oil leak....


Timo

 

Spark plug fell out?

 

&

check your valve cover gasket hasn't popped

 

This may be a dumb suggestion, but check your oil and make sure its not full of gas too.