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8.3 Spark plug maintenance
Spark plug recommendation: TORCH F6RTC, NGK BP7ES, BOSCH WR3C.
1. Unplug the spark plug cap by pulling outward (as shown with the arrow in the
figure below).
2. Using the spark plug spanner, extract the spark plug by unscrewing it from the
engine (turn counter clockwise)
3. Inspect the spark plug visually. Replace with a
new one if the insulator is cracked or chipped.
Clean the electrode with a fine wire brush to clean
the filth deposits.
4. Measure the electrode distance with a gauge.
Normal value 0.6 - 0.8 mm. Adjust the opening
carefully if the value is not correct.
5. Place the spark plug again carefully, start screwing
by hand to avoid overlapping threads. Once the
spark plug is threaded to the end of the thread, make
the final tightening:
• New spark plugs, 1/2 turn with the spark plug spanner.
• 1/8 to 1/4 turn used spark plugs with spark plug spanner.
6. Install the spark plug pipette or cap and close the spark plug access cover,
fixing it with the screw.
NOTE: The spark plug must be tightened firmly. A loose spark plug may
overheat and even damage the engine. Similarly, over tightening may damage the
spark plug and, worse, the engine cylinder head thread.
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