2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Repair Manual, PN 5005466, Page 157Get this manual
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POWERHEAD ASSEMBLY68 Check piston with micrometer to determine if piston has been distorted during assemblyMeasure the piston at two places, 90 from each other, 18 to 14 in(3 mm to mm) above bottom ed