2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 295Get this manual

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EMISSIONS
Timing: Not Adjustable CDI Controlled Spark Plug: NGK LFR5A-11 Gap: 0.043" (1.1 mm) Valve Clearance (Cold) mm Intake: 0.20+ 0.03 Exhaust: 0.34+ 0.03

FEL: 30.94 GMKW-HR

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