well i checked a mc16 piston and barrel with waynes mc18, and it all looks to be the same. both pistons are the same size, fit both barrels with the same clearance. both are marked KV3. the only differance i could see is the mc16 piston is marked HF1 inside, the mc18 is marked HF4.this is the early mc18 engine.
so what do we think guys?