Arctic Cat ZR 120 (2012-2024) Spark Plug Replacement Guide
Keep your youth snowmobile starting easy and running strong with the correct new spark plug.
- The standard OEM replacement plug is an NGK CR7HSA; the Champion Z9Y and Autolite 4194 are direct cross-references.
- Symptoms of failure include no-start, hard starting, and sluggish acceleration.
- Always check that the spark plug gap is set to 0.028" (0.7mm) before installation.
- Replacement is a very easy DIY task that takes less than 15 minutes.
Is Your ZR 120 Hard to Start or Running Rough? Check the Spark Plug.
For the 2012-2024 Arctic Cat ZR 120, the spark plug is a critical maintenance item that is easy to forget. Before you suspect a more complex carburetor or engine issue, a simple spark plug inspection can often solve common problems. A worn, fouled, or damaged plug can prevent the engine from starting at all or cause it to run poorly. Because it's an inexpensive and simple part to replace, it should be one of the first things you check.
Symptoms of a Failing Spark Plug
- Engine Won't Start: If the engine cranks but won't fire up, you may have no spark.
- Hard Starting: The engine takes many pulls or a long time to start, especially when cold.
- Sluggish Acceleration: When taking off, the engine feels weak or bogs down before picking up speed.
- Rough Idling: The engine idles unevenly or stalls after starting.
- Engine Misfires: You might hear a popping or sputtering sound from the exhaust, indicating incomplete combustion.
No Recalls, But Still a Wear Item
Our searches found no official recalls or Technical Service Bulletins (TSBs) from Arctic Cat or the NHTSA related to spark plugs for the 2012-2024 ZR 120. However, spark plugs are a normal wear-and-tear component that require regular replacement.
Choosing the Right Aftermarket Spark Plug
You don't need to buy a spark plug from an Arctic Cat dealer to get reliable performance. The original equipment (OEM) plug is made by NGK, and you can buy the exact same plug from an aftermarket supplier. Champion and Autolite also offer direct-fit, quality alternatives.
Brand Quality Tiers
- Tier 1: Premium Aftermarket (NGK): The standard OEM plug is the NGK CR7HSA. This is a proven, reliable copper plug that offers factory performance. For a longer-lasting upgrade, you can choose an Iridium version like the NGK CR7HIX, which is more resistant to wear and provides a more consistent spark over its life.
- Tier 2: Quality Aftermarket (Champion, Autolite): Brands like Champion and Autolite offer direct cross-references that provide dependable performance. The Champion Z9Y and Autolite 4194 are excellent copper-core alternatives that meet or exceed the requirements for the ZR 120's engine.
Pro Tip: Always Check the Gap
Even if a spark plug says it's "pre-gapped," you should always verify the gap with a feeler gauge before installation. The correct gap for the standard NGK CR7HSA plug is 0.028" (0.7mm). An incorrect gap can cause a weak spark and poor performance.
Cost of Replacing a ZR 120 Spark Plug
| Option | Estimated Cost |
|---|---|
| New Aftermarket Spark Plug (NGK, Champion, Autolite) | $3.50 - $9.31 |
| New OEM Spark Plug | $8.00 - $15.00 |
| Shop Labor | $20.00 - $40.00 |
Frequently Asked Questions
How often should I change the spark plug on my ZR 120?
For a youth snowmobile like the ZR 120, it's good practice to inspect the spark plug at the beginning of each season and replace it if it looks fouled or worn. Replacing it every season or every other season, regardless of appearance, is cheap insurance against starting problems.
What is the difference between a standard copper and an iridium spark plug?
Standard plugs use a copper core with a nickel-alloy electrode, which is great for conductivity and works perfectly in the ZR 120. Iridium plugs have a fine-wire center electrode made of iridium, a much harder metal. This allows them to last significantly longer and maintain a precise spark for better efficiency over time.
Is replacing the spark plug a DIY job?
Yes, this is one of the easiest maintenance tasks you can perform. You only need a spark plug socket and a ratchet. The job takes less than 15 minutes.
What happens if I don't tighten the spark plug enough?
An under-tightened spark plug won't seal properly against the cylinder head. This can cause it to overheat and can lead to a loss of compression, poor performance, and potential engine damage.
Technical Specifications
OEM Part Numbers: 3008-321
Standard Plug: NGK CR7HSA Champion Equivalent: Z9Y Autolite Equivalent: 4194 Thread Diameter: 10mm Hex Size: 5/8" (16mm) Standard Gap: 0.028" (0.7mm)
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Arctic Cat ZR 120: