2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 466Get this manual

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IGNITION SYSTEM
S PECIFICATIONS BKR5E-11 (NGK), K16PR-U11 (DENSO) 1.0 1.1 mm (0 .O39 0.043 in) 100 minimum 0.7 minimum 10 STDC at idle

TORQUE VALUES
Spark plug Timing hole cap

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