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4 cylinder 4 stroke air cooled engine with opposed cylinders,hydraulic valve tapped,automatic carburetor,mechanical fuel pump,magneto single or magneto-electronic dual ignition,wet sump pressure lubrication.
S2100UL/2200UL是一款四缸四冲程风冷发动机，带有对抗气缸，分接液压阀，自动化油器，机械燃油泵，单电磁或电磁-电子双点火，吹扫型加压润滑。