lucky you to be able to drive a bike in the rain !!...

here its to cold to even be brave enough to fill up the engine !!

it is minus 22 degree celcius here !!

without the wind !! with the wind, it goes down to near minus 40 !!!!!.... i dont know how much degree F it is for you but i can feel my balls getting upper in my pants !!

sorry for your engine anyways.... could be a valve too... feel if there is pressure coming out of the air box, or open up the valve cover....