Rider 15-V2, runs one cylinder and spits gasolin

[Congame]

Hi,

My Rider 15-V2 is only running on one cylinder and spits gasoline back out through the carburetor, I have checked that there is a spark so I'm guessing it could be a stuck valve maybe.
It spits a lot of gas so it could be something with the floater maybe.

Where do I start and what is most likely to guess this issue, is it a know problem?

Best Regards
Soren

 

[bertsmobile1]

You start by removing the rocker covers and check that the valves are moving as they should