1981 Johnson/Evinrude 4HP Outboards Service Repair Manual P/N 392069, Page 42Get this manual

1981 Johnson/Evinrude 4HP Outboards Service Repair Manual P/N 392069, Page 42

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Since the pistons, with the piston rings, receive the force of combustion in the cylinder head, it is necessary that both the pistons and piston rings properly fitted to form seal between the piston h