Came across this and had to try it (sliding a beer can in a OHH50 2.625 bore) and it fit pretty darn close! Didnt try to insert a piston into the can though, looks about a mm too small.
"....I recall taking an H35 Tecumseh I had on a mini-bike to shop class at vocational school and my teacher used a aluminum beer can to sleeve the cylinder-it happened to fit perfect,and to hold it from sliding up and down in the cylinder he just cut slots in the can and folded the metal over at the top and bottom of the cylinder....he said "It'll probably not last long"....it was more of a learning experience than an actual fix..to show us how they can sleeve a scored cylinder to salvage an otherwise good engine..
it ran great for a few weeks,then seized up tight...then I took it back to shop class and he sent it to the machine shop class,who bored it oversize so a piston we salvaged from a Tecumseh 4 HP push mower would fit it...we found out when we went to assemble it the connecting rod wrist pin bore was not the same size,so we tried substituting the connecting rod from the engine the piston came from and it fit the crankshaft,but the length overall was shorter by about 1/8" ,so it barely had enough compression to run very well..the engine would rev like crazy though!..just lacked power at take off and lugging.."
"....I recall taking an H35 Tecumseh I had on a mini-bike to shop class at vocational school and my teacher used a aluminum beer can to sleeve the cylinder-it happened to fit perfect,and to hold it from sliding up and down in the cylinder he just cut slots in the can and folded the metal over at the top and bottom of the cylinder....he said "It'll probably not last long"....it was more of a learning experience than an actual fix..to show us how they can sleeve a scored cylinder to salvage an otherwise good engine..
it ran great for a few weeks,then seized up tight...then I took it back to shop class and he sent it to the machine shop class,who bored it oversize so a piston we salvaged from a Tecumseh 4 HP push mower would fit it...we found out when we went to assemble it the connecting rod wrist pin bore was not the same size,so we tried substituting the connecting rod from the engine the piston came from and it fit the crankshaft,but the length overall was shorter by about 1/8" ,so it barely had enough compression to run very well..the engine would rev like crazy though!..just lacked power at take off and lugging.."