1979 Johnson Outboards 4 HP Models Service Repair Manual P/N JM-7903, Page 52Get this manual

1979 Johnson Outboards 4 HP Models Service Repair Manual P/N JM-7903, Page 52

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Since the pistonswith the piston ringsreceive the 01 combustion in the cylinder headit is necessary that both the pistons and piston rings properly 1itted to seal between the piston head and cylinder

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