Best Small Engine Spark Plug for Mowers, Tools, and More

#1 · Best Overall

1. Suptizizkz L7T Plugs

• Core Material: Copper
• Top Material Type: Copper
• Compatible with Vehicle Type: Lawn Mower, Scooter
• Thread Size: 14mm x 1.25mm

Best for: Small two-stroke tool engines.

Why it ranks #1: Lists fit for 36cc–52cc two-stroke engines across chainsaws, trimmers, blowers, and brushcutters, plus dimensions and several replacement references.

Three L7T plugs are listed for 36cc–52cc two-stroke small engines, including chainsaws, trimmers, blowers, and brushcutters. The range of replacement references—such as NGK BPMR7A and Champion RCJ6Y—helps owners compare the plug against a named part already in use.

The listed 14mm thread diameter, 9.5mm thread length, 19mm hex, and 0.7mm gap give buyers several concrete measurements for checking fit. The stated application range covers 36cc–52cc two-stroke engines, and the description names chainsaws, lawn mowers, trimmers, blowers, and brushcutters. Replacement references include NGK BPMR7A, BPM7A, BM6A, and Champion RCJ6Y and RCJ7Y. The listing cautions that only plugs of the same size can replace one another, making dimension checks central to installation.

Skip it if you need a named Honda GCV160 or GCV190 plug; Honda 98079-56846 is listed for those engines.

Owners maintaining listed 36cc–52cc two-stroke tools can use the dimensions and cross-references to assess this three-plug set. Confirm all key measurements, since the listing says replacement is suitable only between plugs of the same size.

Listed on Amazon as: 3Pcs L7T Spark Plugs for 36cc 43cc 47cc 49cc 52cc 2-Stroke Small Engine Chainsaw Trimmer Mower Blower Brushcutter Replace NGK BPMR7A BPM7A Champion RCJ6Y RCJ7Y Spark Plug

#2 · Best GCV Fit

2. Honda BPR6ES

• Core Material: OEM HONDA "MADE IN JAPAN" RETAIL PACKAGING
• Top Material Type: OEM HONDA "MADE IN JAPAN" RETAIL PACKAGING
• Compatible with Vehicle Type: OEM HONDA "MADE IN JAPAN" RETAIL PACKAGING
• Thread Size: OEM HONDA "MADE IN JAPAN" RETAIL PACKAGING

Best for: Honda GCV160 and GCV190 service.

Why it ranks #2: The listing specifically names Honda GCV160 and GCV190 engines, giving buyers of those common small-engine applications a direct model match.

Honda’s BPR6ES plug is explicitly listed for GCV160 and GCV190 engines, making those engine families the clearest fit for this small-engine replacement. The product description also names several GCV160 variants, helping owners narrow their search by engine designation.

The 98079-56846 part number and BPR6ES designation give Honda owners two identifiers to compare with their engine information. The description specifically lists GCV160 and GCV190, then names GCV160 variants including GCV160A, GCV160A0, GCV160E, GCV160LE, and GCV160LA. That detail can help during replacement-part selection for those engines. The listing presents it as a Honda lawn mower and tiller spark plug, but its thread-size field does not provide a usable dimension, so the engine designation is the more helpful stated fit reference.

Skip it if you need an NGK BPR5ES for most Honda small engines; Honda 98079-55846 lists that plug designation.

Owners of the listed Honda GCV160 or GCV190 engines have a specific BPR6ES reference to check for mower or tiller maintenance. Use the engine designation and part number to verify the application, since no usable thread dimension is supplied.

Listed on Amazon as: Honda 98079-56846 (BPR6ES) Small Engine Spark Plug for GCV160, GCV190

#3 · Honda Engine Pick

3. Honda BPR5ES

• Core Material: Alloy Steel
• Top Material Type: Alloy Steel
• Compatible with Vehicle Type: Honda Engines
• Thread Size: 14mm or 16mm

Best for: Honda OEM engine replacement.

Why it ranks #3: Genuine Honda OEM plug listed for most Honda small engines, with interchangeability noted for other engines using the same plug.

Genuine Honda OEM supply paired with the NGK BPR5ES identification is the defining feature here. It gives owners of many Honda small engines a direct reference point for replacement, while the listed interchange also extends to other small engines that use this same plug specification.

The listing identifies this as Honda part 98079-55846 and names the NGK BPR5ES, so owners can compare both references against their engine information before servicing. Honda says it fits most Honda small engines and can interchange with other small engines using this plug. The specification gives a 14mm or 16mm thread size, so checking the complete engine numbers remains important rather than relying on brand alone. No components are listed as included.

Skip it if you need a specifically identified BPR6ES for a GCV160 or GCV190; Honda 98079-56846 names those engines.

Honda small-engine owners seeking the listed BPR5ES OEM replacement have a clear part-number reference and stated interchange. Verify the complete engine numbers and the applicable thread size, since the listing gives two thread-size options.

Listed on Amazon as: Genuine Honda OEM Spark Plug 98079-55846 (NGK BPR5ES) Honda & other small engines

#4

4. Briggs & Stratton 796112

• Core Material: Copper
• Top Material Type: Metal
• Compatible with Vehicle Type: [IN] Inferred: Lawn mowers, go-karts, and…
• Thread Size: 796112

Best for: Briggs mower maintenance.

Why it ranks #4: The two-pack replaces J19LM, RJ19LM, 802592, and 5095K, making it a useful direct replacement when one of those numbers is specified.

A two-plug pack of Briggs & Stratton 796112 replacements brings together the 796112 number and listed cross-references J19LM, RJ19LM, 802592, and 5095K. That makes it a practical choice when maintaining equipment that calls for one of those identified plugs, with a second plug available in the same purchase.

The copper core and metal top identify the construction, while the product title and specifications connect this plug to Briggs & Stratton 796112. Its listed replacement references—J19LM, RJ19LM, 802592, and 5095K—give owners several numbers to compare with their existing part before installation. The two-pack also leaves a matching spare for a later service. The listing suggests lawn mowers among compatible equipment, but does not supply a clear dimensional thread measurement.

Skip it if you need a clearly stated thread dimension before buying; Honda 98079-558-46 lists 14mm or 16mm instead.

Briggs & Stratton owners replacing a plug identified by one of the listed reference numbers can use this two-pack for scheduled maintenance. Check the engine’s part identification carefully, since the listing does not provide a conventional thread-size measurement.

Listed on Amazon as: Briggs & Stratton 796112-2pk Spark Plug (2 Pack) Replaces J19LM, RJ19LM, 802592, 5095K by Briggs & Stratton

#5

5. Briggs & Stratton 491055

• Core Material: Copper
• Top Material Type: Metal
• Compatible with Vehicle Type: Lawn Mower
• Thread Size: 491055

Best for: Briggs mower replacement pair.

Why it ranks #5: A two-pack genuine replacement listed for lawn mowers and multiple Briggs & Stratton replacement numbers, including 805015 and 72347.

A two-plug pack bearing Briggs & Stratton part number 491055 is the main draw for lawn-mower maintenance. The listing also gives replacement references 805015, 72347, and Champion RC12Y, helping buyers check a known part number before opening the engine for service.

The copper-core plugs have metal tops, and the product description identifies them as genuine OEM replacement part 491055-2PK. Those details give owners a defined replacement reference and a matched pair for a service task or spare. The listing names lawn mowers as the compatible vehicle type and includes Kohler CH11S engine references in its compatibility text. Because the description asks buyers to consult the owner’s manual and refer to its compatibility list, checking the engine number remains part of choosing this plug.

Skip it if you want a plug whose listing gives a conventional thread dimension; NGK BPMR7A specifies 14mm.

Lawn-mower owners matching the 491055 or listed replacement references can use this pair for routine plug service. Its description includes Kohler CH11S references, but checking the full compatibility list and manual is essential before installation.

Listed on Amazon as: Briggs & Stratton 491055-2pk Spark Plug (2 Pack) Replaces 805015/72347/491055/Champion RC12Y

#6 · Handheld Tool Fit

6. NGK BPMR7A

• Core Material: Copper
• Top Material Type: Metal
• Compatible with Vehicle Type: Car, Truck
• Thread Size: 14mm

Best for: BPMR7A two-stroke replacement.

Why it ranks #6: The BPMR7A model and 14mm thread suit buyers whose equipment calls for this specific plug; it comes as a two-pack.

NGK’s BPMR7A identification, copper core, and 0.03-inch gap make this two-plug set easy to compare with a specified replacement. Buyers maintaining equipment that calls for the BPMR7A can check both its named part and gap before beginning service.

The two-plug package uses NGK part BPMR7A and lists a 14mm thread with a 0.03-inch gap. Those measurements provide useful checkpoints when comparing the plug with an equipment manual or removed part. Copper is the stated core material, and the description identifies the plugs as NGK Standard Series. The supplied compatible vehicle types are car and truck, rather than a named small-engine model, so buyers seeking a small-engine application should rely on the exact BPMR7A reference rather than assuming compatibility from the product’s general ignition claims.

Skip it if you need plugs explicitly listed for 36cc–52cc two-stroke tools; Suptizizkz L7T lists those engine sizes.

Buyers whose application specifically calls for NGK BPMR7A can use this pair and its stated thread and gap measurements as fit checks. The listing does not name a small-engine model, so match the exact engine specification first.

Listed on Amazon as: NGK (6703) BPMR7A Spark Plugs Individual Boxed – 2 Pack, Copper

#7 · John Deere Fit

7. Champion M78543

• Core Material: Copper or Platinum or Iridium
• Top Material Type: Nickel
• Compatible with Vehicle Type: ATV, Tractor, UTV
• Thread Size: 14mm x 1.25mm

Best for: John Deere two-plug service.

Why it ranks #7: The two-pack is identified as a John Deere original equipment spark plug, with M78543 and M87543 application references.

The John Deere M78543 identification and two-plug format make this Champion set a focused replacement option for equipment calling for the listed part. Its title also names M87543 and RC12YC engine references, giving owners several identifiers to compare before a maintenance session.

Champion supplies two plugs under the M78543 reference, and the description identifies the item as John Deere original equipment spark plug M78543. The listing also names M87543 and RC12YC, which can help owners cross-check an existing plug or parts record. A 14mm x 1.25mm thread specification adds a concrete dimension for checking application details. The stated compatible vehicle types include ATV, tractor, and UTV, so the set suits buyers maintaining those kinds of equipment when the part reference matches.

Skip it if you maintain a Honda GCV160 or GCV190 and need its named BPR6ES; Honda 98079-56846 lists those engines.

Owners of John Deere equipment matching the M78543, M87543, or RC12YC references can keep two plugs together for service. Treat the listed references as a fit check, especially when maintaining an ATV, tractor, or UTV.

Listed on Amazon as: (Pack of 2) Champion Spark Plugs for John Deere M78543, M87543, RC12YC Engine

#8

8. Champion RC12YC

• Core Material: Copper
• Top Material Type: Metal
• Compatible with Vehicle Type: Car, Truck
• Thread Size: 14×19

Best for: Craftsman RC12YC replacement.

Why it ranks #8: Includes two genuine RC12YC plugs and lists Craftsman equipment references, but the supplied vehicle compatibility field is automotive.

Two genuine Champion RC12YC plugs anchor this set, with Craftsman compatibility references supplied in the description. That combination helps owners servicing listed Craftsman equipment match a named replacement part and keep a second plug ready for a later maintenance interval.

The pack contains two RC12YC plugs, and the listing identifies 14×19 as the thread specification and 0.04 inches as the gap size. Those details give buyers concrete values to compare with an owner’s manual before installation. The description names several compatible Craftsman equipment numbers, including 580751781 and 580742780, rather than relying only on a broad brand label. Copper core and metal top complete the stated construction details; the listing specifically recommends consulting the manual for correct part identification and installation.

Skip it if you need a Honda-specific plug for a GCV160 or GCV190; Honda 98079-56846 is expressly listed for those engines.

Craftsman owners whose equipment matches the listed numbers can use this two-plug RC12YC set for replacement work. Compare the gap and part identification with the owner’s manual before installation, as the listing itself recommends.

Listed on Amazon as: Champion Spark Plug for Craftsman (2 Pack) # 71G RC12YC-2pk

#9

9. NGK BPR5ES

Best for: NGK BPR5ES two-plug set.

Why it ranks #9: This two-pack is identified as NGK standard BPR5ES, but the supplied listing provides little small-engine fit information beyond the plug model.

This NGK Standard BPR5ES pack supplies two plugs under the 7734 OEM part reference. That specific identification gives owners looking for a BPR5ES replacement a straightforward number to compare with existing service records or their engine documentation.

The listing names the product as NGK Standard BPR5ES and also gives OEM part number 7734, so buyers have two identifiers for checking a replacement. A two-plug pack is useful when the service plan calls for more than one plug or when keeping a matching spare. The supplied specifications do not state a thread size, gap, or compatible engine model, making the BPR5ES and 7734 references the available fit checkpoints. Confirm that the engine calls for this exact plug before installation.

Skip it if you need a Honda plug listed for most Honda small engines; Honda 98079-55846 identifies the BPR5ES interchange.

Owners whose engine documentation calls for NGK BPR5ES or OEM part 7734 have a clearly named two-plug option. Since the listing provides no engine model or dimensional fit details, match the specified plug reference before buying.

Listed on Amazon as: NGK Spark Plug Standard BPR5ES – Pack of 2

#10

10. Champion RC12YC 515312

• Core Material: Iridium
• Top Material Type: Copper
• Compatible with Vehicle Type: Car, Truck
• Thread Size: 14mm

Best for: Champion RC12YC replacement.

Why it ranks #10: The product is identified as an RC12YC two-pack, but its listed compatible vehicle types are car and truck rather than small-engine equipment.

The genuine Champion RC12YC identification is the clearest reason to consider this plug for equipment that specifies that part. Its listing also identifies it as Champion Copper Plus 71, giving buyers a second product reference to compare with service documentation.

Champion’s description calls this a genuine two-pack of Copper Plus 71 spark plugs, while the product title and specifications identify RC12YC. Those references help buyers check whether this is the replacement their equipment specifies. The specifications list an iridium core, copper top, and 14mm thread, offering construction and size details for comparison. The compatible vehicle types are listed as car and truck, and no small-engine model is named, so small-engine buyers should confirm the exact RC12YC requirement before installation.

Skip it if you need an explicitly listed Craftsman RC12YC two-pack; Champion RC12YC #71G names that application.

Buyers whose equipment documentation specifies Champion RC12YC can use the part identification and 14mm thread as checkpoints. The listing names cars and trucks, not small-engine models, so verify the exact application before choosing it for small-engine service.

Listed on Amazon as: GENUINE CHAMPION SPARK PLUGS – RC12YC SPARK PLUG (PREM PLUG IS 2071) 515312