When racing Triumphb 650s, we always used 12 to 1 Hepolite pistons with methanol. In one petrol motor, Iused two standard compression BSA Gold STar pistons, and machined the adges of rge crown to fit closely into the Trumph head - effectively making a squish band similar to the one in a Jawa Speedway motor. The pistons were lighter, and there was less obstruction to gas flow actross the crown of the piston, when both valves are open at TDC. Even with four stroke engines, there are Kadency Effects.
Kadency Effects are not only about scavenging. In my 850 motor, there are no steps in the exhaust ports or where the pipes fit, and I use skinny pipes, not fat ones.
At TDC, exhaust gas travels in two directions, some contains fuel mixture. The exhaust system resonates.
It would be very easy to turn straight away to the practical workshop aspects of improving the performance of two stroke engines. Eventually, of course, we mus
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