Oh I was a bit more scientific than that and had good results. I had "Two stroke tuning" by A. Graham Bell and loads of tuning articles by Matt Oxley in one of the bike mags which gave precise instructions. Ports were raised on exhausts, widened on transfers and lowered on inlets, radiused and matched to one another, heads lapped in without head gaskets to maximise squish, extra base gasket to raise transfers and inlets etc etc... Harpower reed valves with cut out and gas flowed reed cages, allspeed expansions, no air filter but airbox had to be kept or it just didn't run, 15 sizes up on standard main jets!! 2 clicks up on needle jet, Gold palladium plugs, pre mix in tank lube with racing 2 stroke oil, autolube not used. It was fun.