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jeez they look close to 1986 CR250, i will have to measure and get back to you. Sorry Paul, similar look but different dimensions the 86' CR250 Honda is 47mm high x 64mm long (across)
I had a GEM reed block on a '74 CR250 elsinore and i used a late 70's complete YZ80 reed cage and boyesen petals which bolted straight up to the GEM housing and was much less restrictive than the standard 2 row 12 petal GEM setup.