I agree, it does look like ABN....odd that again as I have a .18 CXP and that is ABC.......guess we would really need to learn Chinese to find out what happens over there.
Having said that my engine is a rotary carb. model and I think the OP has a slide carb.

That sleeve is damaged.

you need to fully disassemble the engine. If you pulled the sleeve out why cant you see the crank/piston/and driveshaft now? pull the back plate and then pull the engine and crank to examine them. It sounds to me like you should just trash this engine and get a reliable aftermarket replacement of modest cost. I have 3 .28 JL I will sell you one if you like. The pullstart is trashed, you were using a drill to start it but not with a roto-start, just ghetto rigged. Anything you did could have brought about damage to the crank or one way bearing etc. It sounds like you break something and instead of repairing it you rig it up. That is asking for further damage down the line.