Get quick starts and the power your engine is expected to deliver with the Autolite spark plug 4164, a copper-core plug designed for both. It is a direct-fit application for a wide range of cars, motorcycles, ATVs and small engines, including the 2016-2019 Honda TRX250X, 2010-2016 Arctic Cat 300 and 1988-1991 BMW M3 (L4-2.3L). See the "Vehicles it fits" section for the full list of applications.
- Copper core center electrode: helps with thermal control and improves resistance to fouling.
- Nickel electrodes: a nickel center electrode tip and a nickel ground electrode are designed for extended life.
- High-alumina multi-rib ceramic insulator: provides thermal conductivity and strong insulation for added strength.
- Nickel-plated shell: resists corrosion for added durability.
Specifications: M12 x 1.25 metric thread, 19 mm (0.75 in) reach, 11/16 in hex, and a flat seat with a flat washer included. It comes pre-gapped at 0.8 mm (0.03 in). This is a resistor-type plug rated at 5,000 ohms, with Autolite heat range 11, mid projection, a 2.7 mm insulator tip projection and a removable terminal nut. The plug is not indexed.
The number of plugs needed depends on the application. For example, the 2016-2019 Honda TRX250X takes two plugs and the 1988-1991 BMW M3 (L4-2.3L) takes four. Country of origin: China. Backed by Autolite's 2-year limited warranty.
Frequently Asked Questions
What are the thread size and reach of the Autolite 4164?
It has an M12 x 1.25 metric thread, a 19 mm (0.75 in) reach and an 11/16 in hex. It uses a flat seat, and a flat washer is included.
What gap does the Autolite 4164 come set to?
It comes pre-gapped at 0.8 mm (0.03 in). Check the gap against your vehicle's or engine's service information before you install it.
How many Autolite 4164 plugs do I need?
It depends on the application. The 2016-2019 Honda TRX250X uses two and the 1988-1991 BMW M3 (L4-2.3L) uses four. Check the "Vehicles it fits" section for your vehicle or engine.
Is the Autolite 4164 a resistor spark plug?
Yes. It is a resistor-type plug rated at 5,000 ohms, and it has a removable terminal nut.
What are signs a spark plug may need replacing?
Hard starting, misfires, rough idle or fouled electrodes can be signs of worn plugs. Other ignition or fuel problems can cause these symptoms too, so diagnose the cause before replacing parts.
