I'm new to the world of small two-stroke engines. I've just got a pair of 1949 Trojan Mini Motors that I'm hoping to get running. Working on the first engine, the piston and cylinder appears to be in good condition, with minimal wear. I've now replaced the piston rings (the previous rings were seized in their slots). Two quick questions to get me started:
1. Should I hone the bore for the new rings? If so, how can this be done by hand?
2. I've got quite a few spare parts and it appears that I've got two different types of cylinder. One has a raised lip around the top that mates into a recess around the combustion chamber of the cylinder head. The other has a flat mating surface. Was this a change that took place during the production run? Do both types use the same head gasket?