Son put straight gas in PW50

[Nick]

So my son put straight gas in his PW50 without me knowing then went to ride it. The auto mixer is disconnected so I run oil directly in the fuel instead of the little tank that was in front of the handlebars. Now the bike won't run. I'm wondering what kind of damage I'm looking at. Will I just need a piston and ring, or will I need a new head as well? Thanks for any info.

[ploddit]

More likely to need a new cylinder, or rebore if it's scored. IMHO head damage is rare. You'll have to open it and see.