1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Repair Manual P/N 500607, Page 79Get this manual
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Disassembly
[!!] 2 Remove primer plunger from housingDiscard O-ringsInspection
1 Inspect brass plunger shaft for any burrs or scratchesRemove small scratches by polishing the plunge