hi im nick im new to this forum and i have a roketa 800cc buggy its carburated and it wont run right the three cylenders have psi of 90,180,160 from outside to inside its only running off two cyliinders does anyone have any info to help me please help!!!!!!!

Put alittle oil in the bad one and do a comp test if it goes high its rings if not its prob valves.Try it keep us posted!

You need to do a leak down on the low psi cylinder.
Bring the piston to top dead center apply 80 -100 psi and see where the air is coming out of, intake,exhaust,head gasket,or crank case breather, and that will tell you where the problem is.
Be very careful when you put the air psi to the cylinder if it's not perfectly on top dead center the engine will rotate and fingers in the v-belt hurt!!

W.C.