Honda EM1600X Owner's Manual page 22

Spark plug service
Recommended spark plug: BPGES, BPRGES (NGK)
W20EP-U, W20EPR-U (ND)
To ensure proper engine operation, the spark plug must be properly gapped
and free of deposits.
1. Remove the spark plug cap.
2. Clean any dirt from around the spark plug base.
3. Use the wrench supplied in the tool kit to remove the spark plug.
PLUG
WRENCH
SPARK
PLUG CAP
4. Visually inspect the spark plug. Discard it if the insulator is cracked or
chipped. Clean the spark plug with a wire brush if it is to be reused.
5. Measure the plug gap with a feeler gauge.
The gap should be 0.7-0.8 mm (0.028~0.031 in). Correct as
necessary by carefully bending the side electrode.
0.7-m mm
(0.028~0.031 in)
20