1965 Evinrude 90 HP StarFlite Service Repair Manual, P/N 4206, Page 52Get this manual

1965 Evinrude 90 HP StarFlite Service Repair Manual, P/N 4206, Page 52

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Carbon accumulation on walls of the exhaust ports restricts the flow of exhaust gases and has considerable effect on performance of the motorCarefully scrape carbon from cylinder heads and exhaust por