1972 Johnson 2R72 2HP Outboard Motor Service Repair Manual P/N JM-7201, Page 32Get this manual

1972 Johnson 2R72 2HP Outboard Motor Service Repair Manual P/N JM-7201, Page 32

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5-2 DESCRIPlON

THEORY OF OPERATION
Two-eyele engines used outboard motors require only two piston strokesone u, one down, to effeet erankshaft revolution and to eomplete the exhaust

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