1979 V6 150-235 HP Johnson Outboards Service Repair Manual P/N JM-7910, Page 137Get this manual

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Specific gravity will vary points (.004) with every 10 0F (6temperature changeFor each lOF (6below 80F (27 ), subtract points from hydrometer readingFor each 100 (6above 800 (27 ), add points to hydro

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