Best Spark Plug Indexing Tool for 14mm and 18mm Plugs

#1 · Best Overall

1. Allstar Performance ALL96510

• Weight: 0.22 kg

Best for: 14mm indexing with instructions.

Why it ranks #1: Its listed 14mm fit covers flat-gasket and tapered-seat plugs, and instructions are included for using the tool.

Included instructions distinguish the Allstar Performance ALL96510 for buyers who want guidance alongside a 14mm spark plug index tool. It accepts both flat-gasket and tapered-seat plugs, while its stated purpose is positioning the ground strap to improve piston-dome clearance and unshroud the electrode.

The 14mm fit and compatibility with flat-gasket or tapered-seat plugs let one tool cover those two plug configurations. Its indexing function positions the ground strap for piston-dome clearance and exposes the electrode more directly, according to the supplied description. Instructions are included to support the indexing workflow. The listed plastic core and top material identify its construction, while the single-tool package keeps the offering focused on this specific task.

Skip it if you need an indexer for 18mm plugs; the ALL96510 is specified for 14mm spark plugs only.

The Allstar ALL96510 suits a 14mm plug job where instructions and compatibility with both flat-gasket and tapered-seat plugs matter. Its 14mm specification is the boundary for buyers handling other thread sizes.

Listed on Amazon as: Allstar Performance ALL96510 Engine Spark Plug Index Tool for 14mm Spark Plug

#2 · Best Specified 14mm

2. Moroso 62160 Indexer

Best for: 14mm seat-style plug users.

Why it ranks #2: The listing specifies 14mm threads and flat or taper seat plugs, with a hex-head design and black anodized finish.

A hex-head design paired with compatibility for both flat and taper-seat 14mm spark plugs gives the Moroso 62160 a clear role in indexing common seat styles. Its specified thread size keeps the choice straightforward for buyers whose plugs match that size and who want a purpose-specific indexing tool.

The 14mm thread size narrows the fit to matching spark plugs, while the stated flat/taper seat compatibility covers two seat styles within that size. A hex head provides a defined form for handling the indexer during plug work. The black-anodized finish is an identifying surface treatment, and the package dimensions are compact at about 12.953 × 9.652 × 1.524 cm. Together, these details make it a focused option rather than a multi-thread-size tool.

Skip it if you need one tool for 18mm plugs as well; the stated thread size here is 14mm only.

Choose the Moroso 62160 for indexing work on 14mm flat- or taper-seat plugs when its hex-head form suits your workflow. It is not the fit for a job that requires 18mm thread compatibility.

Listed on Amazon as: Moroso 62160 14mm Spark Plug Indexer

#3 · Best 14mm and 18mm

3. Bruce & Shark Indexing Tool

• Weight: 1.76 oz
• Dimensions: 5.91 x 4.33 x 0.79 in

Best for: Can-Am 14mm and 18mm plugs.

Why it ranks #3: It explicitly lists 14mm and 18mm spark plug threads and names Can-Am Defender and Maverick fitment, with a year-model check advised.

Compatibility with both 14mm and 18mm spark plug threads is the Bruce & Shark indexer’s key distinction for Can-Am Defender and Maverick owners. Its aluminum construction and vehicle-specific fitment details make it relevant when those applications and thread sizes match the job.

The listed 14mm and 18mm thread compatibility lets this indexer serve more than one plug size, while its stated Defender/Maverick fitment narrows the vehicle context. Aluminum construction keeps the tool’s listed material clear, and the compact 5.91 × 4.33 × 0.79-inch dimensions describe its physical footprint. The product is presented as an aftermarket replacement, so checking the exact vehicle year and model remains part of selecting the correct application.

Skip it if you have a vehicle outside the stated Can-Am Defender/Maverick fitment; the listing asks buyers to check exact year and model.

This Bruce & Shark option suits Defender or Maverick owners needing an indexer for either listed thread size. Its stated vehicle application is the key boundary, so verify the exact model and year before choosing it.

Listed on Amazon as: Bruce & Shark Spark Plug Indexing Tool for Can Am Defender/Maverick, 14mm & 18mm Aluminum Spark Plug Threads

#4 · Universal Thread Range

4. OFKSEWP Universal Indexer

Best for: Compact-space dual-size indexing.

Why it ranks #4: Its description states 14mm and 18mm compatibility and says the compact design is intended for tight engine spaces.

The OFKSEWP indexer pairs 14mm and 18mm plug compatibility with a compact design stated to improve access in tight engine spaces. That combination gives buyers working on small engines or off-road vehicles a tool aimed at both thread-size flexibility and confined access.

Compatibility with 14mm and 18mm spark plugs supports work across the two listed thread sizes, while the compact design is specifically described as helping access tight engine spaces during installation or removal. Its indexing function is intended to adjust plug position where orientation affects engine function. The description also mentions alignment of split-skirt pistons, offering a stated application beyond ordinary plug positioning. These details make it relevant to buyers whose maintenance work involves limited clearance.

Skip it if you need a stated material specification before choosing a tool; OFKSEWP’s supplied details do not name its construction material.

The OFKSEWP suits small-engine and off-road maintenance where 14mm or 18mm plugs and restricted access are relevant. Its compact-access claim is useful, but buyers requiring a specified material have no listed material detail to assess.

Listed on Amazon as: Indexing Tool Spark Plug Indexer Universal 14mm 18mm

#5

5. MAD HORNETS 14mm Indexer

• Weight: 1.76 oz
• Dimensions: 5.91 x 4.33 x 0.79 in

Best for: UTV electrode-orientation work.

Why it ranks #5: This aluminum UTV/SXS tool is listed for 14mm plugs and explains its purpose as identifying electrode location after installation.

Electrode-location identification is the MAD HORNETS indexer’s defining function, helping UTV and SXS owners check plug orientation after installation. Its description explains the desired electrode direction toward the exhaust valve, making this a focused choice for buyers working to align plugs consistently.

The tool is specified for 14mm spark plugs and described for UTV/SXS use, including Can-Am Defender and Maverick applications in its title. Its stated job is to identify where the electrode sits once the plug is installed, so users can assess orientation rather than relying on the plug’s position by guesswork. The description connects exhaust-facing electrode openings with optimum burn and warns that intake-facing orientation can risk spark blowout, especially on turbocharged engines.

Skip it if you need a tool explicitly specified for 18mm plugs; Bruce & Shark’s 14mm and 18mm indexer covers both listed thread sizes.

Choose the MAD HORNETS tool for UTV/SXS plug work when checking electrode direction is central to your indexing process. Its supplied thread specification is 14mm, so it does not cover every plug size.

Listed on Amazon as: MAD HORNETS 14mm Spark Plug Indexer Indexing Tool Universal For Can Am Defender Maverick

#6

6. Areyourshop 14mm Indexer

• Weight: 1.76 oz
• Dimensions: 5.91 x 4.33 x 0.79 in

Best for: Defender and Maverick replacement.

Why it ranks #6: The listing names Can-Am Defender and Maverick models and describes an aluminum UTV/SXS indexer; buyers should verify exact vehicle fit.

The Areyourshop indexer names Can-Am Defender and Maverick models as its target applications, giving those owners a specific replacement-oriented option. Its aluminum construction and 14mm title identify the tool’s material and central thread-size context for plug indexing work.

The listed Defender and Maverick suitability helps frame the intended vehicle application, while the product title identifies a 14mm spark plug indexer. The description says the tool identifies electrode location, connecting the accessory to checking plug orientation during maintenance. Aluminum is the stated material, and the compact listed dimensions of 5.91 × 4.33 × 0.79 inches give buyers a sense of its physical size. The listing advises confirming the exact year and model before ordering.

Skip it if you need verified 18mm thread compatibility; the supplied title identifies a 14mm indexer rather than listing both sizes.

Consider Areyourshop for Defender or Maverick maintenance when a 14mm indexer matches the plug and vehicle. The listing’s year-and-model check matters, and the supplied title does not establish 18mm compatibility.

Listed on Amazon as: 14Mm Spark Plug Indexer Indexing Tool Universal For Can Am For Defender For Maverick

#7

7. Artudatech Universal Indexer

• Weight: 1.76 oz
• Dimensions: 5.91 x 0.79 x 4.33 in

Best for: Dual-thread UTV indexing.

Why it ranks #7: The description identifies an aluminum UTV/SXS indexer and claims 14mm and 18mm thread fit, but gives less application detail.

The Artudatech indexer explicitly lists both 14mm and 18mm spark plug threads, giving UTV owners a two-size option for indexing work. Aluminum construction and the stated Defender/Maverick application add practical context for buyers comparing thread compatibility and vehicle fit.

Listing both 14mm and 18mm threads broadens the plug-size range this tool is specified to handle, while the title connects it to Can-Am Defender and Maverick applications. Its aluminum material and compact 5.91 × 0.79 × 4.33-inch dimensions describe the tool’s construction and footprint. The description identifies electrode location as the purpose of indexing, making it relevant for users who need to check plug orientation as part of their maintenance workflow.

Skip it if you need a tool with a broader stated vehicle application than Defender/Maverick; the listing centers on those models.

The Artudatech indexer fits buyers who need the stated 14mm and 18mm thread coverage for Defender or Maverick plug work. Its listed vehicle context is the main fit consideration when selecting it.

Listed on Amazon as: 14Mm Spark Plug Indexer Indexing Tool Universal For Can Am Defender Maverick Fits For 14mm and 18mm Spark Plug Threads

#8

8. VIPIH Universal Indexer

• Weight: 1.76 oz
• Dimensions: 5.91 x 4.33 x 0.79 in

Best for: Lightweight dual-thread UTV tool.

Why it ranks #8: The listing claims fit for 14mm and 18mm plugs and UTV/SXS use, but provides fewer specific fit and use details.

At a listed weight of 1.76 ounces, the VIPIH indexer offers a lightweight option while specifying compatibility with 14mm and 18mm spark plug threads. Its aluminum construction and UTV/SXS description suit buyers seeking a compact tool for plug-orientation work.

The two listed thread sizes, 14mm and 18mm, give the tool a broader stated plug range than a single-size indexer. Its description says the tool identifies electrode location, supporting orientation checks during plug work. Aluminum is the stated material, and the 1.76-ounce listing provides a concrete weight reference for handling or storing it with maintenance equipment. The product is described for UTV/SXS use, which helps define its intended application.

Skip it if you need an indexer specified for a broader vehicle category; the VIPIH listing describes UTV/SXS use.

Choose VIPIH for UTV/SXS plug work when dual 14mm and 18mm thread compatibility and a listed 1.76-ounce weight suit your needs. Its stated vehicle context is UTV/SXS, not an all-vehicle fitment claim.

Listed on Amazon as: 14Mm Spark Plug Indexer Indexing Tool Universal For Can Am Defender Maverick