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pdlouche-
Haha true! I nerded out about expansion chambers a few years ago when I looked into the maths of how they work. Very keen to make one. The little RS is prime candidate as it has the wrong pipe on it and should have a good bit of potential. Need to wait for the next top end to trace the ports and measure the port timing. I’m not geeky enough to take it apart for the sake of it…
Jung
Got my welding gear set up! Will be knocking out the expansion chambers in no time. (Not)