Spark Plug Service - Schwarzbau AG-HA-6500 Owner's Manual

(3) Spark plug service

Recommended spark plug: BP6ES, SPR6ES (NGK)
F6TC, F6RTC (LD)
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.
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 0.7~0.8mm (0.028~0.031 in). Correct as necessary
by carefully bending the side electrode.
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