V-Power Spark Plug # 4536

The NGK V-Power Spark Plug #4536 (XR45) is a premium resistor-type spark plug engineered for reliable ignition across a wide range of small engine and automotive applications. Featuring a 14mm thread size with 0.375-inch reach and gasket seat design, this plug delivers consistent spark performance in both stock and tuned engine configurations. The resistor construction suppresses electromagnetic interference, protecting engine control systems and radio equipment from noise-related disruptions.

The 0.375-inch reach specification ensures proper seating depth in the combustion chamber, critical for optimal flame kernel development and burn characteristics. This geometric precision prevents electrode fouling and extends service intervals under normal operating conditions. NGK's V-Power line employs proven electrode materials and insulator formulations that withstand thermal cycling and corrosive combustion byproducts, maintaining stable firing voltage across the plug's operational lifetime. The gasket seat design provides positive sealing in standard spark plug sockets, eliminating the need for tapered-seat adapters and simplifying installation on equipment designed for this plug type.

This plug serves equipment requiring dependable cold-start performance and stable idle characteristics, making it suitable for marine engines, small displacement motorcycle and ATV powerplants, and compact automotive engines where OEM or quality aftermarket ignition replacement is required. The resistor type is essential in applications where radio interference must be controlled, such as vessels with communication systems or vehicles operating in frequency-sensitive environments.

When selecting a spark plug, matching thread size, reach, and seat type to the engine's original specification is non-negotiable—incorrect geometry compromises ignition timing and combustion efficiency. The NGK V-Power XR45 provides that exact fit for compatible equipment, delivering the thermal range and construction quality expected from a manufacturer with decades of OEM supply and replacement-market credibility. Sold as a single plug.