1976 Johnson 4HP 4R76, 4W76 Outboards Service Repair Manual P/N JM-7603, Page 38Get this manual
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Sinee the pistons, witll tlle ist rings, reeeive tlle foree of eombustion tlle eylinder head, it is neeessary that both the ists piston rings properly fitted to form seal tw the piston head and eylind