Spark Plug: Service and Repair

SPARK PLUG REPLACEMENT
Replace spark plugs as follows:
1. Dust off cylinder head around spark plugs.
2. Disconnect high-tension cords at spark plugs. To avoid inside damage of cords, DO NOT pull on cords for disconnection. Pull on caps.
3. Using a spark plug wrench, remove spark plugs.
4. Check plug gaps of new spark plugs, and adjust them to specification as necessary.
Air gap "a": 1.0 - 1.1 mm (0.039 - 0.043 in.)
Plug type:
NGK - BPR6ES-11
NIPPONDENSO - W2OEPR-U11
AC - R42XLS
5. Install new spark plugs. Tighten plugs to specification.
Tightening Torque for spark plug: 25 - 30 N.m (2.5 - 3.0 kg-m, 18.5 - 21.5 lb-ft)
6. Connect high-tension cords to spark plugs. DO NOT push cords for connection. Push boots.