Spark plugs are essential for maintaining petrol power in machinery. STIHL NGK spark plugs differ slightly from standard NGK plugs, even with the same part number. They are specifically designed for STIHL machines, ensuring optimal performance.

Key Differences between STIHL NGK spark plug (right) and standard NGK plug (left):

• The union nut (1) of a STIHL spark plug is fixed in place, preventing spark gaps that could affect performance or ignite gasoline fumes.
• Interference suppression resistance (2) is specifically tuned for STIHL machines, optimising spark efficiency and protecting the ignition module from premature failure.
• The sealing ring (3) is coated for improved contact and corrosion resistance, particularly in harsh and damp conditions.
• The electrode gap (4) is set for STIHL products to ensure optimal compression.

STIHL recommends always using STIHL NGK spark plugs for best results.

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