1974 Johnson 135 HP Outboard Motors Service Repair manual P/N JM-7412, Page 17Get this manual

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CHART (CONT)
SPARK PLUGSSee Section inner termina1 damaged (termina1 point out of H.T.1ead) Faulty 1eads crossed 1eads Loose spark p1ugs (10w torque) Defective spark p1ugs (cracked insu1ator) In

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