2004-2006 (2007) Honda TRX400FA Fourtrax Rancher / TRX400FGA Rancher AT GPScape Service Manual, Page 400Get this manual
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IGNITION SYSTEM
The ignition timing is correct if the "F" mark on the flywheel aligns with the index mark on the rear crankcase cover at idleIncrease the engine speed and make sure the "F" mark