1971 Johnson 4HP Outboard Motors Service Repair Manual P/N JM-7102, Page 41Get this manual
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DO NOT sth cylil1der head gasket suf of lid Use suface plate to surface this PISTONS CI1eck the ists for roundness, excessive s!1i al1d sigThe ist skirts must fectly roul1d ul1scratched to vl1t the of