Blow By

[dude]

I am working on stock 49cc 4t. The comp. is 120psi should it be closer to 150psi? I havent checked the vavles. It has about 500 miles on it. But it has a lot of blow by coming out the vavle cover vent hose. Does not like to run with air box hooked up. I am thinking It maybe rings or crack piston. Almost forgot it was way over full on oil but not now. What do you think?

[stepthrutuner]

Not much you can do to improve that situation w/o cracking it open. Check/adjust the valves. If they need no adjustment you'll have to open it up and put in some new parts.... probably rings and head gasket at a minimum. Sounds like big bore time to me (not a lot more). If no money is desired to be spent on it use some Restore to get a few more hundred miles out of it.

[dude]

I tore it down and the 2nd ring was stuck. But because it was over full on oil does reverse hydrolock sound possible?

Almost forgot the 49cc had a 44mm bore/60cc

[90GTVert]

I would think it'd take an awful lot of oil to hydolock it from the crank side. Most folks that add too much just end up pouring a full qt in. A full qt wouldn't lock the engine up I wouldn't think.