First clean the motor and everything around it, then you will have to remove the chain, the exhaust and carb, then the two forward most motor bolts and pivot the motor down, now remove the 4 bolts holding the head and cylinder on. Remove the head and cylinder. Now stuff a clean shop rag in the motors opening to prevent debris and the circlips from entering the crankcase. Remove the criclips, remove the piston pin and the piston will be free. Remember when putting the motor back together to make sure everything is 100% clean and oil the piston pin,piston pin bearing,piston, Piston rings and cylinder walls with two- stroke oil. Now reverse the disassembly process. It may sound like a lot, but actually it is quite simple.
Live to ride, Ride to work