2004 SR Johnson 4 Stroke 9.9-15HP Outboards Service Repair Manual P/N 5005655, Page 79Get this manual
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IGNITION AND ELECTRICAL STARTER
Vernier calipers Outside diameter: Standard: 30 mm (1.18 in) Service limit: 29 mm (1.14 in)
If out of specificationReplace Measure: Mica undercut dep