1992 Johnson Evinrude "EN" 9.9 thru 30 Service Repair Manual, P/N 508142, Page 75Get this manual
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Disassembly
Inspect brass plunger shaft for any burrs or scratchesRemove small scratches by polishing the plunger with crocus clothIf the plunger has deep scratches, replace the plungerInspect p