Its projected design exposes the electrode fully, promoting even flame propagation and higher efficiency under load. Perfect for maintaining speed in clone classes. SKU: W31ESU.

Frequently Asked Questions

Q: Is the NGK W31ESU compatible with all clone engines?

A: This plug is specifically engineered for clone setups requiring a 3/4" reach. Always verify your cylinder head's reach requirements before installation to prevent piston-to-plug contact.

Q: What is the benefit of the projected tip design on this spark plug?

A: The projected tip extends the electrode further into the combustion chamber, which promotes more efficient flame propagation and a hotter burn, resulting in improved throttle response.

Q: How often should I replace my spark plug for racing applications?

A: In high-load racing environments, spark plugs are subject to extreme heat and stress. We recommend inspecting your plug after every race weekend and replacing it if you notice electrode erosion or carbon buildup to maintain peak engine performance.

Q: Should I gap this plug differently for a clone engine?

A: While the W31ESU comes ready to use, you should always check the gap against your engine builder's specifications or your class rules to ensure optimal ignition timing and spark intensity.

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