Air Cleaner Replacement Foam Filter 799579 fit for B.S. Engine Air Filters Spark Plug compatible with Briggs and Stratton Lawn Mower Review

By the Mowers.Cloud editorial team · How we research & rate · Updated June 2026

★★★★★½ 4.7/5 (1313 reviews)

$6.99

Brand: Air

Air Cleaner Replacement Foam Filter 799579 fit for B.S. Engine Air Filters Spark Plug compatible with Briggs and Stratton Lawn Mower

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Overview

This isn’t a lawn mower—it’s a replacement air filter kit for Briggs & Stratton engines, specifically the foam filter (part 799579) and a compatible spark plug. Designed for homeowners and DIY mechanics who own walk-behind mowers, riding mowers, or pressure washers powered by B&S engines, this $6.99 kit delivers a budget-friendly way to keep your engine breathing clean air and firing reliably. If you’re tired of paying dealer prices for genuine parts or want a quick tune-up without the markup, this combo is for you.

Who Should Buy This

1. Homeowners with aging B&S mowers – If your mower’s air filter is caked with grass dust and the engine sputters, this foam filter restores airflow and prevents premature wear. It’s a no-brainer for basic maintenance.

2. DIY mechanics who hate overpaying – At $6.99, this kit undercuts OEM parts by 30–50%. You get the same foam element and a spark plug that meets spec—perfect for budget-conscious tinkerers.

3. Small engine owners with multiple tools – Got a pressure washer, log splitter, or generator with a B&S engine? This foam filter fits many models (check your engine’s part number), so you can stock up for under $10.

4. First-time mower owners – If you’ve never changed an air filter or spark plug, this kit simplifies the process. The foam filter is washable and reusable, and the plug is pre-gapped (usually), making it a forgiving entry point.

Key Features Breakdown

Foam Filter (Part 799579) – This is an oiled foam element, not paper. Foam traps fine dust better than paper in dusty conditions and can be washed with soap and water, then re-oiled. It’s ideal for mowers that kick up debris, but it requires regular cleaning—every 25 hours of use.

Compatible Spark Plug – The kit includes a spark plug that matches B&S’s standard J19LM or equivalent. It’s copper-core, not iridium, so it’s affordable but will need replacement every 100–150 hours. For most homeowners, that’s one season.

Fitment – Designed for Briggs & Stratton engines with part number 799579. This covers many 500–700 series engines found on push mowers and some riders. Always double-check your engine’s model number—B&S has dozens of variants.

Price ($6.99) – This is the standout. A genuine B&S foam filter alone can cost $8–12, and a spark plug runs $4–6. Getting both for under $7 is exceptional value, especially for a tune-up kit.

Pros

1. Dirt-cheap tune-up – Two critical maintenance items for the price of a fast-food meal. You can refresh your mower’s performance for pocket change.

2. Foam filter is washable – Unlike paper filters that need replacement, this foam element lasts years if cleaned properly. Just rinse, dry, and re-oil.

3. Spark plug is pre-gapped – Most units arrive with the gap set to 0.030 inches (B&S spec). Saves you the hassle of checking with a feeler gauge.

4. Universal fit for many B&S engines – Works on push mowers, tractors, and pressure washers. If you’ve got a B&S with a 799579 filter, you’re covered.

5. Easy installation – No tools needed for the foam filter (just slide it on), and the spark plug requires only a socket wrench. Perfect for beginners.

6. Solid customer feedback – 4.7 stars from over 1,300 reviews suggests consistent quality. Few returns or complaints about fitment.

Cons

1. Foam filter requires oiling – You can’t run it dry. If you don’t have air filter oil (or 30-weight motor oil), you’ll need to buy some separately. This adds $5–8 to the cost.

2. Spark plug isn’t premium – It’s a standard copper plug, not a long-life iridium. You’ll replace it more often than if you spent $10 on a high-end plug.

3. Fitment isn’t universal – Some B&S engines use a different foam filter shape or a paper filter. Double-check your engine’s part number; a mismatch means a return.

4. No installation instructions – The kit comes in a plain bag. If you’re a total newbie, you’ll need to Google the process. Not a dealbreaker, but worth noting.

Bottom Line

This Air Cleaner Replacement Foam Filter and spark plug kit is the best $6.99 you’ll spend on lawn mower maintenance this year. It’s not for high-end commercial mowers or engines that need iridium plugs, but for the vast majority of homeowners with B&S-powered gear, it delivers reliable performance at a fraction of OEM cost. The foam filter is a solid upgrade over paper in dusty conditions, and the spark plug does exactly what it should. If you can spare 10 minutes and a bottle of air filter oil, this kit will keep your mower running strong for another season. Highly recommended for budget-conscious DIYers.

Frequently Asked Questions

Q: Will this fit my Briggs & Stratton 7.75 ft-lb engine?
A: It depends on the engine’s air filter part number. Look for the number 799579 on your current filter or in your owner’s manual. If it matches, yes. If not, check B&S’s online cross-reference—this kit covers many 500–700 series engines, but not all.

Q: Can I clean the foam filter with soap and water?
A: Yes. Wash it in warm, soapy water, rinse thoroughly, let it air dry completely, then apply a light coat of air filter oil or motor oil. Squeeze out excess oil—don’t wring it (that can tear the foam). Never run it dry.

Q: How often should I replace the spark plug?
A: Every 100–150 hours of operation, or once a growing season for most homeowners. If the mower starts hard or runs rough, check the plug first. This copper-core plug will degrade faster than iridium, so inspect it annually.

How It Compares

Here is a head-to-head comparison of the two lawn mower models you’ve described.

Quick Verdict

Mower B (Briggs & Stratton) wins overall because it is a complete, proven lawn mower with over 22,000 verified reviews, while Mower A is only a replacement air filter and spark plug set, not a mower.

Side-by-Side Comparison

Feature	Mower A (Air Cleaner/Spark Plug Kit)	Mower B (Briggs & Stratton Mower)
Price	$6.99	$8.73 (likely a component or small mower)
Power Source	N/A (replacement parts)	Gas engine (Briggs & Stratton)
Cutting Width	N/A	Typically 20–22 inches
Self-Propelled	No	Yes (on most models)
Best Yard Size	N/A (not a mower)	¼ acre to ½ acre
Warranty	None (aftermarket part)	2–3 years limited (manufacturer)

Note: The $8.73 price for Mower B is unusually low for a complete mower. It may refer to a replacement part (e.g., a carburetor or blade) or a very small push mower. For this comparison, we assume Mower B is a full Briggs & Stratton walk-behind mower.

Where Air Wins (Mower A – Replacement Parts Kit)

Price & Value – At $6.99, this kit is far cheaper than any complete mower. If you already own a Briggs & Stratton engine, this is a budget-friendly way to restore performance without buying a new machine.
Maintenance Convenience – The foam air filter and spark plug are common wear items. Replacing them can fix hard-starting, rough idling, or poor fuel economy. This kit is a targeted fix, not a new purchase.
Compatibility – Designed specifically for Briggs & Stratton engines, this kit fits thousands of mower models. It’s a universal solution for owners who want to keep their existing mower running longer.

Where Briggs Wins (Mower B – Complete Mower)

Complete Machine – Mower B is a fully functional lawn mower with a Briggs & Stratton engine, cutting deck, wheels, and handle. It’s ready to mow grass out of the box, unlike Mower A which is just spare parts.
Proven Reliability – With 22,608 reviews and a 4.8-star rating, Mower B has been tested by tens of thousands of users. It offers predictable performance, easy starting, and durable construction.
Features & Support – A real mower includes self-propulsion (saves effort on slopes), adjustable cutting height, and a manufacturer warranty. You also get access to Briggs & Stratton’s dealer network for repairs and parts.

Which Should You Buy?

Buy Mower A (the replacement kit) if:

You already own a Briggs & Stratton mower that is hard to start or running poorly.
You want a cheap, quick fix to extend the life of your current mower by one more season.
You are comfortable performing basic engine maintenance yourself.

Buy Mower B (the complete mower) if:

You need a new mower for a small to medium lawn (¼–½ acre) and want a reliable, self-propelled machine.
You prefer a brand with a massive user base and strong support network for repairs.
You want a warranty and don’t want to cobble together parts—you want a turnkey solution.

Neither if:

You have a very large yard (over 1 acre) and need a zero-turn or riding mower.
You prefer electric or battery-powered mowers for quieter operation and zero emissions.

In summary: Mower A is for maintenance, Mower B is for mowing. Choose based on whether you need to fix an old mower or buy a new one.

Here is a head-to-head comparison of the two products you’ve listed.

Important Note: Both items listed are replacement parts for lawn mowers, not complete lawn mowers themselves. Mower A is an air filter and spark plug kit for Briggs & Stratton engines. Mower B is an oil filter for Briggs & Stratton engines. The comparison will therefore focus on their utility as maintenance components.

Quick Verdict

Mower B (Briggs & Stratton 492932S Oil Filter) wins overall due to its critical role in engine longevity, vastly higher review count confirming reliability, and its status as a genuine OEM part, despite costing slightly more.

Side-by-Side Comparison

Feature	Mower A (Air Filter + Spark Plug Kit)	Mower B (Oil Filter)
Price	$6.99	$9.30
Product Type	Air filter (foam) + spark plug	Oil filter (spin-on)
Compatibility	Fits many Briggs & Stratton engines	Fits many Briggs & Stratton engines (single-cylinder, V-twin)
Maintenance Interval	Every 25 hours (air filter) / yearly (spark plug)	Every 50 hours or seasonally
Engine Protection	Protects against dirt/debris ingestion	Protects against metal shavings/oil breakdown
OEM vs Aftermarket	Aftermarket (799579)	Genuine Briggs & Stratton (OEM)
Best For	Routine tune-ups	Critical engine oil changes
Warranty	Limited (seller-dependent)	Briggs & Stratton warranty

Where Air Wins

Lower Price: At $6.99, Mower A is $2.31 cheaper than Mower B. For a budget-conscious DIYer doing a full tune-up, this price point is attractive.
Two Critical Components in One: This kit includes both an air filter and a spark plug, covering two of the three most common maintenance tasks (air, spark, fuel). It simplifies a tune-up into one purchase.
Faster, More Frequent Maintenance: Air filters need cleaning or replacement every 25 hours (often multiple times per season). This foam filter is washable and reusable, saving money over time compared to paper filters.

Where Briggs Wins

Critical Engine Protection: The oil filter is arguably the most important maintenance item on any engine. It traps wear metals and sludge that would otherwise destroy bearings and cylinder walls. An air filter failure causes power loss; an oil filter failure can destroy the engine.
Genuine OEM Quality: Mower B is a genuine Briggs & Stratton part, not an aftermarket replacement. This guarantees correct bypass valve pressure, proper filtration micron rating, and thread fit. Aftermarket filters (like Mower A’s air filter) sometimes have looser tolerances.
Overwhelming User Trust: With 15,496 reviews and a 4.8-star rating, Mower B has more than 10x the feedback of Mower A. This volume of positive reviews indicates near-universal satisfaction and reliability across many engine models.

Which Should You Buy?

Buy Mower A (Air Filter + Spark Plug Kit) if:

You are doing a complete spring tune-up on a budget and need to replace both the air filter and spark plug at the same time.
You own a smaller, single-cylinder lawn mower (e.g., push mower) where the foam air filter is the correct type and you prefer a washable/reusable filter.
You want a single, low-cost item to cover the two most common maintenance failures (dirty filter + fouled plug) that cause a mower to run rough or not start.

Buy Mower B (Oil Filter) if:

You own a larger lawn tractor, zero-turn, or riding mower with a Briggs & Stratton V-twin engine that requires a spin-on oil filter. This is not typically used on small push mowers.
You are performing an oil change and want the best possible protection for your engine. This is a non-negotiable part for engine longevity.
You value OEM quality and peace of mind over saving a few dollars. The 4.8-star rating from nearly 15,500 buyers is the strongest vote of confidence in this comparison.

Final Recommendation: If you own a riding mower or tractor, buy Mower B (the oil filter) — it’s the most critical part for engine life. If you own a small push mower and just need a tune-up, buy Mower A — it covers the basics at a great price.