The Best Spark Plug for Ariens Snow Blower

Choosing the right spark plug is one of the simplest yet most impactful maintenance tasks for your Ariens snow blower. A fresh, correctly gapped plug ensures quick starts, smooth idling, and reliable operation even in subzero temperatures.

The wrong plug, on the other hand, can cause misfires, hard starting, and poor fuel economy when you need the machine most.

With dozens of options on the market, from genuine OEM parts to affordable aftermarket replacements, it is easy to feel overwhelmed.

To help you cut through the noise, we researched and evaluated the leading spark plugs for Ariens snow blowers using our consistent, research-driven SRW Score methodology.

We analyzed specifications, cross-referenced expert review consensus, aggregated verified buyer feedback, and consulted published technical data. The result is a curated list of top-performing plugs that balance compatibility, reliability, and value.

Below you will find our top picks, followed by a detailed buying guide and answers to the most common questions.

Best Spark Plug for Ariens Snow Blower Buying Guide

Engine Type and Spark Plug Compatibility

Ariens equips its snow blowers with engines from different manufacturers, LCT (Loncin), Briggs & Stratton, and occasionally Tecumseh on older models. Each engine family requires a specific spark plug thread size, reach, and heat range.

For example, many modern Ariens units with LCT engines call for a Champion RJ19LM or NGK BR2LM equivalent, while Briggs-powered models often need a Champion RC12YC or NGK BPR6ES.

Always consult your owner’s manual before ordering; the part number printed on the engine shroud is the most reliable reference.

For a deeper look at what makes a machine reliable in harsh conditions, read our guide to the best easy to start snow blower.

Spark Plug Gap and Winter Performance

The gap between the center and ground electrode directly affects ignition energy. In freezing weather, a gap that is too wide can prevent the spark from jumping the gap reliably, leading to hard starts or misfires.

Most Ariens-compatible plugs specify a gap of 0.030 to 0.035 inches. Even “pre-gapped” plugs should be verified with a feeler gauge before installation. A properly gapped plug also reduces the load on the ignition coil, preserving battery and starter life.

If you battle ice buildup on your driveway, our roundup of the best snow blower for ice may offer complementary advice.

Electrode Material: Copper vs. Platinum vs. Iridium

Copper-core spark plugs (such as the standard Champion copper plus or NGK copper) are the most affordable and offer excellent conductivity and heat dissipation.

They are perfectly adequate for seasonal snow blower use, though their service life is shorter, typically 20 to 30 hours of operation.

Platinum and iridium plugs last much longer (up to 100 hours) and provide a more consistent spark over time, but they cost two to four times as much.

For most home owners who use a snow blower a few times per week in winter, a high-quality copper plug is a cost-effective choice.

If you run a heavier machine, check our picks for the best 32 inch two stage snow blower for heavy snow.

OEM vs. Aftermarket: Which Is Better?

Genuine Ariens spark plugs (part numbers like 21533400 or 20001246) are essentially branded versions of standard Champion or NGK plugs. They guarantee exact fitment and are often the safest choice if you want zero guesswork.

Aftermarket plugs from brands like Torch, Stens, or generic multi-packs can save money, especially if you maintain multiple engines. However, quality control can vary. The best aftermarket options use the same manufacturing standards as the major brands.

For a broader perspective on two-stage machines, see the best two stage snow blower guide.

Heat Range and Carbon Fouling

Spark plugs are designed to operate within a specific heat range, the ability to transfer heat away from the tip.

Snow blower engines often run at lower combustion temperatures during light snow removal, which can increase carbon buildup on a plug that is too cold. A plug that is too hot can cause pre-ignition.

Stick with the heat range recommended by the engine manufacturer (usually a “medium” heat range like Champion J19LM or NGK BPR6ES). Using a plug with the wrong heat range is one of the most common DIY mistakes.

To keep your machine in top shape, consider the maintenance tips in our article about the best snow blower for heavy wet snow.

Multipack Value and Storage

Buying a two- or four-pack of spark plugs can be cost-effective if you own more than one power tool or plan to use the same plug in a generator, lawnmower, or snow blower.

Many aftermarket multi-packs use the same plug (e.g., Champion RC12YC) across several brands. Just ensure all plugs in the pack share the same heat range and gap specification. Storing spare plugs in a dry, clean container prevents corrosion.

For additional snow removal gear recommendations, browse our best snow blower deals.

Why You Should Trust Us

Snow Removal Wiki is an independent review publication that follows a rigorous, research-driven methodology. Each product is evaluated using a consistent scoring system called the SRW Score (0 to 10).

We do not conduct our own product trials; our evaluations are grounded in research, published data, expert review consensus, and verified buyer feedback. We analyze specifications, compare performance claims against real-world owner experiences, and cross-reference technical bulletins from engine manufacturers.

This approach allows us to provide unbiased, data-backed recommendations without the bias of direct product trials. Our affiliate relationships never influence our scoring or editorial decisions.

For each spark plug in this guide, we checked official specifications (thread size, reach, hex size, gap, electrode material), read verified buyer comments across multiple platforms, and consulted small-engine mechanic forums and technical manuals.

The SRW Score reflects the overall consensus: how well a plug matches its intended application, its reliability in cold-weather starts, its value for the price, and its availability.

We update this guide annually to reflect new products and changes in manufacturer recommendations. Learn more about our process by visiting our about page.

Final Thoughts

After careful analysis, we have awarded the following notable recommendations to the top performers in our lineup. The scoring reflects a combination of compatibility across multiple Ariens models, verified user satisfaction, and overall value.

• Best Overall: OEM Champion Spark Plug for Ariens 08811700, With the highest SRW Score in its class, this OEM-equivalent plug delivers the perfect balance of fitment guarantee, durability, and price. It is the most consistently recommended plug by both mechanics and experienced owners.
• Best Budget Pick: Compatible Champion RJ19LM / NGK BR2LM Spark Plug, At a fraction of the cost of many OEM options, this aftermarket plug provides reliable ignition in Tecumseh and older Ariens engines. Its wide compatibility makes it a smart choice for those on a tight budget.
• Best for Modern Ariens Engines: Ariens Spark Plug Part # 20001246, This genuine Ariens part is engineered specifically for LCT engines found in current model year snow blowers. Its exact fitment and consistent heat range earned it strong marks from verified buyers.
• Best Multi-Pack Value: 2 Pack Replacement BCPR6ES Spark Plug, Ideal for owners with a Briggs & Stratton engine on their Ariens, this two-pack provides a spare always at the ready. It combines a strong SRW Score with a low per-plug cost.

Frequently Asked Questions

What spark plug does a current Ariens snow blower take?

Most modern Ariens snow blowers with LCT engines use a Champion RJ19LM or its equivalent (NGK BR2LM, Bosch W9ECO, Torch GL4C). Briggs & Stratton-powered models typically require a Champion RC12YC or NGK BPR6ES.

Always confirm the plug number stamped on the engine shroud or listed in your owner’s manual before purchasing.

Can I use an aftermarket spark plug in my Ariens?

Yes, as long as the aftermarket plug matches the OEM heat range, thread size, and gap. Many aftermarket options from brands like Champion, NGK, Torch, and Stens are manufactured to the same standards as OEM plugs.

Verify the cross-reference chart on the packaging or the manufacturer’s website. Buying a reputable aftermarket plug can save money without sacrificing performance.

How often should I replace the spark plug in my Ariens snow blower?

We recommend checking the plug at the start of each winter season and replacing it every 25 to 30 hours of operation, or every two seasons, whichever comes first. A worn plug can cause hard starting, increased fuel consumption, and reduced power.

If you notice rough idling or difficulty starting in cold weather, replace the plug immediately, it is cheap insurance against a stalled machine in a blizzard.

What is the correct spark plug gap for an Ariens snow blower?

The gap ranges from 0.030 to 0.035 inches for most Ariens-compatible plugs. The exact specification is printed on the engine’s emissions label or in the owner’s manual.

Always use a feeler gauge to confirm the gap before installation, pre-gapped plugs can be knocked out of spec during shipping. A properly gapped plug ensures a strong, consistent spark in cold, damp conditions.

For more seasonal maintenance advice, see our comprehensive guide to the best snow blower for your winter needs.

Prices and availability are subject to change. Data accurate as of November 2026.

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