1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Repair Manual P/N 503149, Page 141Get this manual
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2 Start engine and run at 3000 RPM for at least five minutesl
3 Reduce engine speed and run engine at 900 RPM for five minutesMark the cylinder head with 1250 (520and 1630