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My plan is to change the engine capacity of my Burgman from 385 cc to 300 cc by putting a cylinder and piston in of the Burgman 250. They almost fit. Only need to do some bushing in the connecting rod. By making the bore smaller I get some more compression with the 250 cc(bore 73 mm) head. Not sure if I go to the full 13:1 of the Prius. Other users of Atkinson cycle report lower compression ratio.
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