acotrel wrote:I wonder where they got the pistons for the Aerial Arrow? In those days a few pistons were forged, most were cast. The Japanese developed the machine which spun cast then forged the two stroke pistons, so that the grain flow was better, and they did not seize so easily. I'm amazed that the Arrow was so fast without doing a number on itself. The bike which made me laugh was the Greeves which had a big piston diameter, also they intially used GP carbies with big velocity stacks. After the stack fell off and the bike actually revved out they found themselves with a much quicker bike. One of the guys who started historic racing in Australia smashed the shit out of himself when a Greeves seized in a corner. When Jack Findlay was racing the aircooled TR500, Suzuki lent him a couple of their good pistons, then took them back after he won the GP.
They probably run the 2 strokes with extra piston/bore otherwise known as race clearance, a bigger ring gap and a mixture of Castrol R in the gas tank. T being air cooled, they would have still suffered the odd engine seizure