Briggs & Stratton Spark Plug. Briggs and stratton lawn mower spark plug

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Briggs Stratton Spark Plugs

briggs, stratton, spark, plug

We are Briggs Stratton main dealers and as such we stock thousands of Briggs Stratton spark plugs. Find the spark plug you need for your Briggs Stratton lawn mower engine.

Briggs Stratton BS-OHV-HT spark plug for Briggs Stratton overhead valve engines. This spark plug replaces part number 496018E (RC 14YC).

About Briggs Stratton Spark Plugs

If you are unable to find the spark plug you are looking for, you can browse our exploded parts diagrams or search by part number. If you prefer, please feel free to contact us for assistance by calling us on 01482 636210 or e-mailing us at

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Briggs and stratton lawn mower spark plug

briggs, stratton, spark, plug

briggs, stratton, spark, plug

Lawnmower Parts Online is an Irish owned company who’s goal is to provide a one-stop shop for parts and service kits for all your garden machinery. We provide these parts at great factory-direct prices.

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Detailed Discussion: Briggs and Stratton Spark Plug Chart

Only a brief idea won’t help you completely. For that reason, you have to acquire more knowledge about spark plug size and apply them in practical experiences. Now, we will move to the discussion to learn new facts about spark plug.

Mower Spark Plug

For avoiding no electricity running through a spark plug, you have to select the correct size plug for your lawn mower. In most cases, the size remains 14 to 16 mm. Luckily, Briggs and Stratton spark plug will offer you the same size with improved performance. It offers 16 mm of SPH size and 12.7 mm of SPR size. Don’t worry about the thread size as it is 14 mm. You will be given three choices of spark plug for a lawn mower – platinum, NGK and Champion. What I encountered is platinum stands first, Champion in second place and NGK in third place. In my opinion, you should recheck the spark plug’s accurate size before purchasing. Briggs and Stratton have their own way to assist you with that.

Snowblower Spark Plug

Most people become confused about the spark plug size of a snowblower and a chainsaw. It is because their sizes are comparatively too close. However, there are still differences and they are not the same. In the case of a snowblower spark plug, its SPH size is 20.6 mm and SPR size is 9.5 mm. This size is also considered a compatible size for most snowblowers. Briggs and Stratton spark plugs for snowblowers can come in made of three different substances. First, you can choose copper core material which is in the center electrode. Then comes the platinum series and the Champion series. For a better lifespan, they are regarded as the top-notch spark plugs. The thread size is also appreciative for being 14 mm. To get the accurate size spark plug from Briggs and Stratton, you can check out your snowblowers user manual or get in touch with its supplier. Fortunately, you will get vast sizes of spark plug in Briggs and Stratton.

Chainsaw Spark Plug

For your chainsaw, the spark plug matters a lot. It is because an incorrect one will only lead to malfunction of the chainsaw. In a standard manner, chainsaw requires a spark plug with 20.6 mm hex size and gap size is. 030 inches. 8 should be its heat capacity. Fortunately, you will have all these features in Briggs and Stratton spark plugs made for chainsaws. It keeps the thread size 14 mm to be standard to fit without any hazard. But, for chainsaws, Briggs and Stratton prefers platinum, NGK and Champion spark plugs only. These are super handy and effective to avoid damages. If you are unable to find your chainsaw spark plug size in the manual or can not contact the supplier, Briggs and Stratton will help you according to the vehicle’s model.

How to Tell if Your Spark Plug is of Wrong Size?

Though we check everything, mistakes can still occur with anyone. In this way, any of us can get confused and pick the wrong size spark plug. But, you may not find it even while installing the spark plug. However, a few signs are available that will give you hints regarding it. Let’s grab a glimpse of these signs.

Engine Not Getting Enough Fuel

If you experience that the engine of your lawn vehicle is not working like before, the problem can be the incorrect spark plug. It won’t let the fuel reach the engine completely and thus, the engine can stop suddenly, too.

Issues in Fuel Combustion

When the spark plug is of the wrong size, it will create issues in fuel combustion. It is one of the common errors in this respect. As the fuel combustion can not complete the process, the engine won’t have power to operate spontaneously.

Engine Stopping Roughly

We know that the engine of the lawn vehicle will stop gradually and smoothly with the power off command. But, it will face rough troubles in stopping if the spark plug is smaller or bigger than required. Thus, you will encounter rough stopping of the engine. In such situations, your task is to check your lawn vehicle’s needed spark plug size and get the accurate one to get rid of these issues.

Lawn Mower Good Spark Plug vs Bad Spark Plug

Recognizing the symptoms of both good and bad spark plug can let you know its current condition and its contribution to the mower. Check out the differences to know them quickly.

Spark Plug Condition

Bad Spark Plug

The defective one will contain oil deposits, wet fouling, faults in electrodes, corrosion, and so on.

Quality of Acceleration

Good Spark Plug

Bad Spark Plug

A bad spark plug doesn’t burn the mixture of fuel in an efficient way and thus, the exhaust will have the smell of gas.

Answer: You have to check the user manual for knowing about the right spark plug compatible with your lawn tractor. Besides, you can contact your supplier with the tractor’s model identity.

What Spark Plug Should I Use in My Lawn Tractor?

Answer: To get the best performance from your lawn tractor, installing the accurate spark plug is essential. Otherwise, the tractor won’t get enough power to respond to your command.

Answer: Yes, it matters a lot if your lawn mower has a wrong spark plug. It will lead the mower to perform lower than its capacity. It is because the wrong one will affect fuel combustion and reduce the cylinder’s ability.

What is the Right Spark Plug for a Lawn Mower Engine?

Answer: The right spark plug for a lawn mower engine depends on which lawn mower and engine you have. Each of them has a different preference for both the spark plug size and its material. So, check that out in the owner’s manual.

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How to Change the Spark Plug in a Lawnmower (Example: Briggs Stratton Engines in Craftsman and Murray Mowers)

Performing full mower maintenance once per cutting season is important to keep your mower in top running shape. This article is the fourth in a series of maintenance articles that cover complete mower care. While this post is focused on replacing the spark plug in a push-type lawnmower, the basic principles can be applied to all 4-cycle gas powered equipment (including such things as a pressure washer or chipper shredder, and even an automobile).

For the entire series, we’re performing maintenance on both a Craftsman 6.5 horsepower self-propelled mower, and a 4.5 horsepower Murray mower. Both push mowers are powered by Briggs Stratton small engines.

One of the top reasons a lawnmower won’t start is a faulty or worn out spark plug. The spark plug ignites the repeated explosions inside the cylinder of a lawn mower’s engine. Since it sits inside the cylinder, it is subject to very high heat, corrosion, and wear.

When a spark plug detoriates too much, it loses its ability to generate a full spark, and two things can result: (1) the spark plug cannot produce sufficient spark to ignite the fuel in the chamber, and the lawnmower won’t turn over at all, or (2) the spark plug produces a sub-optimal spark, and the explosion inside the chamber is uneven. The second can result in an engine that rattles or vibrates, and occasionally stalls.

Fortunately, changing a spark plug is both simple and inexpensive. Most lawnmower spark plugs are 6500.00 or less at the local hardware store. Here’s the few steps required to change the plug:

How to Change a Lawnmower Spark Plug

Step 1: Locate the spark plug on the engine. On a lawnmower engine, the plug location is usually obvious, as the wire that provides the electricty for the spark connects to the end. On both our Briggs and Stratton engines, the plug is located in roughly the same spot.

Step 2: Remove the spark plug wire and unscrew the plug from the engine. The tool required to unscrew the plug depends on the plug’s location. If the plug is embedded deep inside a hole, you may need to use a spark plug socket to grip and remove it. This special socket has a deep well and a hard foam insert that grips the plug during installation and removal. If you’re planning to do car tune ups in the future, this type of socket is essential. You can find them at most major hardware auto parts stores. If the plug is in an easy-to-access location as it is on both of our mowers, a pair of channel locks will work great.

Step 3: Determine whether the plug needs to be replaced [optional]. We recommend replacing the spark plug every year because it is so simple and inexpensive; however, depending on your lawnmower use this may not be necessary. If the metal hook that sits over the pin looks solid and uncorroded, you may not need to replace the plug.

Step 4: Purchase a compatible spark plug at the local hardware store. Most hardware stores have part look up systems to identify the right spark plug for your mower/engine. Note that even the same manufacturer will occasionally change the designations on plugs, and sometimes multiple plugs will work with the same engine, even if the plugs don’t look 100% identical.

Step 5: Gap the spark plug if necessary. Gapping a spark plug means ensuring that the exact right gap exists between the sparking pin and the L-shaped bracket that covers the pin. Many plugs now come “pre-gapped” and don’t require the user to gap the plug. If your plug does require gapping, all you need is a simple spark plug gap tool (shown on the right). The tool sounds fancy, but it isn’t. It’s a simple tool that has different width metal wires. Insert the correct wire in between the pin and the L-bracket on the plug and bend the L-bracket so it fits snugly around the key. The right spark plug gap is usually listed in the engine manual for the mower.

Step 6: Insert the spark plug back into the mower. Hand tighten the plug at first, ensuring there is no significant resistance. If there is significant resistance, stop immediately to avoid cross-threading. Remove the plug and begin again. Once the plug is hand-tightened, use a rachet/channel locks to tighten the spark plug in place. Do not over-tighten as this could cause the threads to strip. If you have a calibrated torque wrench on hand, you can set the torque to the exact amount suggested by the manufacturer.

Step 7: Reattach the spark plug wire, start the mower, and listen. If the engine is running smooth, you’re successful! If not, recheck these steps to ensure you’ve done everything correctly.

What do you think? Let us know if this post helped, or if you add/remove anything from our instructions.

What to Consider When Choosing the Best Spark Plugs

While it’s possible to replace an old spark plug with the same type or use the riding mower’s owner’s manual to figure out the best spark plugs to use, keep in mind that the manual includes the best spark plugs available at the time the manual was created. If the mower is a few years old, improvements in spark plug technology may make other options viable. The following information explains spark plug technology in detail so you can make an informed decision to purchase the best spark plugs for your riding mower.


The type of spark plug is usually defined by the material used in the electrodes: copper, platinum, or iridium.

  • Copper is the best electrical conductor available for spark plugs. However, it is soft and has a low melting point, so wear rates can be high. To combat this, it is usually coated in a thin layer of nickel alloy. Copper spark plugs are the cheapest type, but they typically need to be replaced about once a season.
  • Platinum is a much harder metal and more resistant to heat. They last up to four times longer than copper, but they are more expensive. Two types of platinum spark plugs are available. Single platinum models have a copper central electrode with a small circle of platinum welded on the end, while the other electrode remains copper only. On double versions, both electrodes have platinum end elements.
  • Iridium (or iridium-enhanced) spark plugs are the most recent development. They are characterized by very thin central electrodes that are extremely hard and can handle very high temperatures. They last up to four times longer than platinum models. Though they may not be a great deal more expensive, the choice of iridium spark plugs for riding mowers is limited.

Size and Electrode Gap

The length of the portion of the spark plug that appears outside the engine is seldom important, but the diameter and length of thread inside the motor is vital. If the diameter is wrong, it simply won’t fit: It either won’t screw in, or it will be too loose. If the length (also called reach) is wrong, it might still fit but there can be other problems. If it’s too short, the spark won’t be in the right place in the combustion chamber, and the motor won’t run properly, if at all. If it’s too long, there’s a real chance of the piston hitting the spark plug, which can cause serious damage. Due to these facts, it’s vital to check all dimensions.

The electrode gap has an impact on performance. It should be accurately set by the factory when the spark plug is made, but as it wears, it becomes larger. Historically, that gap would be checked during maintenance and a gap tool used to adjust the outer electrode. Vehicle tuners may still do so, but most mower owners simply replace the spark plug with a new one; some spark plugs can’t be adjusted, anyway.

Recent innovations also have seen new designs in the shape of the outer electrode. The aim is to produce a more precise spark which burns the fuel and air mixture more efficiently. remain competitive, and it’s an increasingly popular option with those looking for the best spark plug for their riding mower.

Performance Characteristics

Spark plugs also can be described by their heat range. They are either hot plugs or cold plugs. Typically, engines with modest performance use a hot plug for a better fuel ignition, whereas high performance engines use a cold plug for improved heat dissipation.

It’s another area where the wrong choice can cause problems. There’s a misconception that hotter plugs improve performance. However, if the plug runs too hot, the insulation around the central electrode can melt. At best, this causes irregular firing. At worst, it will break away from the spark plug and damage the piston. Spark plug manufacturers usually have comparison charts for other makers’ products so heat range can be checked, along with the plug’s physical attributes.

The ignition circuits that allow a plug to produce a spark also cause electromagnetic interference (EMI) and radio frequency interference (RFI). These can actually disrupt spark performance. To prevent this, a suppressor is used; it is usually built into the insulation around the central electrode. The intent is to make the mower engine run more smoothly. Though usually present, it’s a feature not often mentioned.


There are manufacturing standards that help support any quality claims that a company may make in spark plug packaging and advertising. Both SAE International (formerly known as the Society of Automotive Engineers) and ISO (the International Organization for Standardization) produce standards for spark plugs, which are extensive and highly technical. Many spark plug manufacturers comply with these requirements and may even state that they are in compliance. It’s important to understand these standards organizations cover the quality and accuracy of manufacturing, not any performance characteristics.