Did dirt get into the engine thru the carb? If no dirt went thru the carb then your home free. You probably already know not to try to turn the crank if you did get dirt inside the engine. I normally hold my thumb over the carb opening and blow off the rest of the engine with the needle nozzle and air hose. If dirt did get inside then I disassemble the engine and soak/wash it in a coffee can and kerosene. If the engine is real gunky then I clean it in an old crock pot and anti-freeze.
The piston and liner have to be put back the same as they came out. I make a small scratch on the conrod but all you have to remember is on the front of the big end the hole is slightly beveled. DO NOT use anything to pry on the liner if it is stuck! Sometimes I insert an old copper glow plug gasket in the exhaust port and the turn the crank to raise the liner so that I may get a better grip on it with my fingers. I have not had my AX apart but if I remember right there is a small pin in the top of the case and a notch in the liner so that it will only go back one way on some OS engines. If I have told you wrong I'm sure I will be promptly corrected.
Hope I have helped a little bit.
Fred