1990 Johnson Evinrude "ES" 9.9 thru 30 Service Repair Manual, P/N 507871, Page 143Get this manual
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oversizeoversize piston is availabIe for this engine (0.030 in 0,762 )determine oversize add 0.030 in(0,762to the standard Refer to Engine Specifications, Section 1 It is permissibIe to have oversize