Cheres its is a rider with the flywheel between the power pistion and the displacement pistionWe need to know exactly what engine you're referring to. Is it a "Rider" engine with the flywheel between a hot and a cold cylinder or an "Ericsson" engine with a walking beam and single cylinder? Both were made by the "Rider-Ericsson Engine Co.".
Thanks mate just don't no mutch on them all i had in the start was 4 palettes of bitsOn the 10 inch rider I do not think they are 90 degrees off I think it is greater than that but do not know how much greater . also I think the stroke on the hot side is longer than the stroke on the cold side .. I have A 10 inch Rider here I will be taking the cold piston out in about 3 weeks to work on it on and can get closer measurements if needed Buster
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This 10 inch rider has A tag says Rider Ericsson also has one more tag where it was shipped to Australian Branch Sydney . N.S.W Buster