Autolite Xtreme Sport Iridium Spark Plug XS4162

Hard starts, fouled plugs and a rough idle often trace back to a worn spark plug. The Autolite Xtreme Sport Iridium Spark Plug XS4162 (part number XS4162) is an Autolite Xtreme Sport plug with an iridium-enhanced 0.6 mm finewire tip, built for powersports engines. Autolite says it delivers up to 26% quicker starts than a leading standard plug.

Witchdoctors carries spark plugs for UTVs, ATVs and motorcycles. Check the specs below against your owner's manual or your current plug before you order.

Why Choose Autolite

Autolite has made spark plugs in the U.S. for decades and supplies plugs for cars, trucks, small engines and powersports. Its copper core plugs are a proven, low-cost standard, and its Xtreme Sport line adds an iridium-enhanced finewire tip for powersports engines.

Key Features

• More focused ignition to help prevent fouling, compared with a leading standard plug
• 0.6 mm finewire center electrode with a Sport V-trim ground electrode, for better ignitability and durability than a standard plug
• Up to 26% quicker starts than a leading standard plug
• More horsepower and better fuel efficiency than a standard plug, per Autolite
• Meets or exceeds OEM design

Specifications

• Thread: M12 x 1.25
• Reach: 3/4" (19 mm)
• Hex: 11/16"
• Seat: Flat, with washer
• Resistor: Yes
• Pre-gap: 0.030" (0.8 mm)
• Autolite heat range: 15
• Terminal: Removable nut

Specs are taken from published Autolite catalog data. Confirm them against your engine's requirements before installing.

What’s Included

One Autolite spark plug, part number XS4162. Most engines need one plug per cylinder, so check how many your engine uses.

Fitment and Compatibility

This listing does not have vehicle fitment data yet. Spark plugs are chosen by engine, not just by model, so match the part number in your owner's manual, a cross-reference from your current plug, or the thread, reach, hex and heat range listed above. Contact our team with your year, make, model and engine if you need help.

Iridium Finewire vs. Copper Core

Copper core plugs conduct heat well and cost less, but their nickel alloy electrodes wear faster, so they need replacing more often. Iridium-enhanced finewire plugs like Autolite Xtreme Sport need less voltage to fire, resist fouling and usually last longer, at a higher price. Use the type your engine maker recommends; some engines are designed for copper plugs.

Prefer copper? See the Autolite Copper Core Spark Plug 4162.

Understanding Heat Range

Heat range describes how fast a plug moves heat away from its tip. A plug that runs too cold can foul with carbon; one that runs too hot can overheat and cause pre-ignition. On Autolite plugs, a higher number generally means a hotter plug. Stick with the heat range your engine maker specifies unless you have changed the engine's tune.

Signs You Need New Plugs

• Hard starting or more cranking than usual
• Misfires, stumbling or a rough idle
• Loss of power or poor throttle response
• Worse fuel economy
• Black, wet or white deposits on the plug tip
• Worn, rounded electrodes or a wide gap

Installation

Work on a cool engine. Blow debris out of the plug well before removing the old plug. Check the gap but don't pry on the finewire center electrode; adjust only the ground electrode if needed. Thread the new plug in by hand to avoid cross-threading, then tighten to the torque in your service manual. Don't overtighten.

Pro Tip

Inspect the old plug as you remove it. Its color tells you how your engine is running: light tan or gray is healthy, black and sooty points to a rich mixture, and white or blistered points to running hot or lean.

Care and Maintenance

Replace plugs at the interval in your owner's manual, and sooner if you ride in mud, water or dust. Keep a spare in your tool kit on long trail rides. Check plug wires and caps when you change plugs, since a worn cap can cause misfires even with a new plug.

Why Buy From Witchdoctors

Witchdoctors carries spark plugs from Autolite, NGK, Champion and E3, plus ignition parts for UTVs, ATVs and Victory and Indian motorcycles. Our team can help you match the right plug to your engine.

Related Products

• Autolite Xtreme Sport Iridium Spark Plug XS4164
• Autolite Xtreme Sport Iridium Spark Plug XS4163

Autolite Spark Plugs · Shop All Spark Plugs · NGK Spark Plugs · UTV Ignition Parts

Helpful Guides From the Witchdoctors Blog

• How to Inspect & Replace UTV/ATV Spark Plugs and Wires
• Polaris Tech Tip: How to Inspect Polaris UTV/ATV Spark Plugs and Ignition Coils
• How Do I Test a UTV or ATV Ignition Coil with a Multimeter?
• No Spark? How to Diagnose and Test a Bad Pickup Coil With a Multimeter

Frequently Asked Questions

Is this genuine Autolite?

Yes. Witchdoctors sells genuine Autolite spark plugs.

Will it fit my machine?

This listing has no fitment data yet. Match the part number from your manual or a cross-reference, or contact our team.

Is it pre-gapped?

Autolite lists a 0.030" (0.8 mm) pre-gap. Always check it against your engine's spec.

How many do I need?

Usually one per cylinder; check your engine.

Where to Ride

Fresh plugs, quick starts. Take your machine to one of these riding areas:

• Brimstone Recreation (Huntsville, Tennessee): about 300 miles of trails
• Paiute ATV Trail (central Utah): 250 miles of marked trail linking to 2,000+ more

Order Today

Add the Autolite Xtreme Sport Iridium Spark Plug XS4162 to your cart. Stock can vary, so contact our team if you need it by a certain date.

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Returns

If your order arrives and it is not right, we will we'll fix it. We promise!

Doesn't fit or just not happy with it? You can return any new, unopened, unused or unaltered item within 30 days of delivery receipt of your item. We will issue a refund to your original payment method.

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