2006 Johnson SD 30 HP 4 Stroke Outboards Service Repair Manual, PN 5006592, Page 148Get this manual
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POWERHEAD CYLINDER HEAD If the spring's preload is less than the service limit, replace the valve springValve Spring Preload 43 to 50 Ibs(193 to 223 N) for Standard 1.48 in(37.5 mm) 40 Ibs(177 N) for