Best Spark Plug For Motorized Bike: Compare 10 Options

#1 · Best Overall

1. QAZAKY Z4C

• Core Material: Copper
• Top Material Type: Copper
• Compatible with Vehicle Type: Moped
• Thread Size: 14mm x 11mm

Best for: Five-plug Z4C stock.

Why it ranks #1: Explicitly fits 49cc–80cc two-stroke motorized bicycles and includes five plugs; specifications give a copper core, 14mm x 11mm thread, and 0.03-inch gap.

Five Z4C plugs make this QAZAKY set a practical match for owners who want several replacements on hand for listed 49cc–80cc two-stroke engines. Its compatibility details name motorized bicycles, mopeds, and scooters, as well as examples including Yamaha JOG50 and Suzuki AG100, helping buyers assess the intended range.

The five-piece quantity supports keeping replacements available for repeated maintenance, rather than sourcing a single plug each time. QAZAKY lists 49cc, 50cc, 66cc, 70cc, and 80cc two-stroke applications, and names Chinese and Japanese mopeds and scooters alongside motorized bicycles. The copper core and 14mm x 11mm thread are useful specifications to compare with the old plug. A stated 0.03-inch gap adds another detail for owners checking their ignition setup.

Skip it if you want a larger ten-plug supply; YOFMOO’s Z4C pack lists ten plugs for the same broad engine range.

Choose QAZAKY’s five-pack for ongoing service of listed 49cc–80cc two-stroke bikes or mopeds, especially when keeping multiple replacements together matters. Check its 14mm x 11mm thread and 0.03-inch gap against your setup.

Listed on Amazon as: 5pcs Spark Plug Z4C for 49cc 50cc 66cc 70cc 80cc 2-Stroke Engine Motorized Bicycle Moped Scooter Yamaha JOG50 90 ZX50 DIO50 Suzuki AG100 QJ50 DX100 AX100 CJ750

#2 · Best Multipack

2. YOFMOO Z4C

• Core Material: Copper
• Top Material Type: Copper
• Compatible with Vehicle Type: Scooter
• Thread Size: 14mm

Best for: Ten-plug Z4C maintenance pack.

Why it ranks #2: Its Z4C fitment covers 49cc–80cc two-stroke motorized bicycles, and the ten-plug pack suits owners who want multiple replacements on hand.

Ten Z4C plugs set YOFMOO’s offering apart for owners maintaining multiple small engines or keeping a larger replacement supply. The listing covers 49cc–80cc two-stroke motorized bicycles and names several Chinese and Japanese scooter models, while its 14mm thread and 11mm thread length help buyers check installation fit.

A ten-plug quantity gives a workshop or rider several replacements to draw on for listed 49cc, 66cc, 70cc, and 80cc engines. YOFMOO also identifies the plug for Chinese and Japanese 49cc–80cc two-stroke motorized bicycles and scooters, including named models such as Yamaha JOG50 and Suzuki AG100. Its 14mm thread diameter and 11mm thread length help with dimensional matching; the listed 66mm overall length adds another installation reference.

Skip it if you only want one replacement plug; FLYPIG’s Z4C listing provides a single-plug alternative for the same broad engine range.

YOFMOO suits riders, repairers, or owners of several listed 49cc–80cc two-stroke machines who want a substantial Z4C supply. Confirm the 14mm diameter, 11mm thread length, and overall length suit the engine.

Listed on Amazon as: Spark Plug Z4C for 49cc 50cc 66cc 70cc 80cc 2-Stroke Engine Motorized Bicycle Moped Scooter Yamaha JOG50 90 ZX50 DIO50 Suzuki AG100 QJ50 DX100 AX100 CJ750 Pack of 10

#3 · Best Specified Dimensions

3. FLYPIG Z4C

• Core Material: Copper
• Compatible with Vehicle Type: Scooter
• Thread Size: 14mm

Best for: Single Z4C direct replacement.

Why it ranks #3: This Z4C is listed for 49cc–80cc two-stroke motorized bikes and specifies a 14mm thread, 9mm thread length, and 68mm overall length.

A stated 9mm thread length distinguishes this FLYPIG Z4C, giving buyers a useful dimension for assessing replacement fit on listed 49cc–80cc two-stroke motorized bicycles. The fitment also names 50cc, 60cc, 66cc, and 70cc engines, with selected Chinese and Japanese moped and scooter models included.

FLYPIG lists this plug across 49cc–80cc two-stroke engines and names specific 50cc, 60cc, 66cc, and 70cc sizes, helping buyers compare the engine to the stated range. The 14mm thread diameter and 9mm thread length provide dimensional references for installation, while the 68mm overall length gives another measurement to check. Described as a direct replacement for an old plug, it suits a straightforward swap when those dimensions match.

Skip it if you want several replacements together; QAZAKY’s Z4C five-pack covers a listed 49cc–80cc range.

This FLYPIG Z4C fits a buyer seeking a single replacement for a listed small two-stroke engine, with useful thread and overall-length details. Match its 9mm thread length as well as the 14mm diameter before installation.

Listed on Amazon as: FLYPIG Z4C 49cc 2 Stroke Engine Spark Plug for 50cc 60cc 66cc 70cc 80cc

#4

4. amavoler Z4C

• Core Material: Copper
• Top Material Type: Nickel Alloy
• Compatible with Vehicle Type: Motorcycle, Scooter
• Thread Size: M14x1.25

Best for: Broad-range Z4C replacement.

Why it ranks #4: The listing explicitly covers 49cc–80cc two-stroke motorized bicycles and gives a copper core and M14x1.25 thread, though it includes one plug.

The Z4C replacement covers listed 49cc through 80cc two-stroke engines, giving motorized-bike and moped owners one clearly specified option across several common small-engine sizes. Its fitment list also names selected Yamaha, Suzuki, and other models, helping buyers compare their engine or vehicle against the supplied compatibility details before installation.

The stated 49cc–80cc two-stroke range spans several motorized bicycle and scooter sizes, so this plug suits owners whose engine falls within that listed band. Named examples include Yamaha JOG50 and Suzuki AG100, which make the compatibility information more useful than displacement alone. A copper core and M14x1.25 thread provide concrete specifications for checking the part against the existing plug. The listing describes installation as easy, supporting a straightforward replacement workflow.

Skip it if you need several replacement plugs in one purchase; the listing includes only one Z4C plug.

Choose this amavoler Z4C for a listed 49cc–80cc two-stroke bike, moped, or scooter when its M14x1.25 thread and named fitment match your setup. The single-plug supply is the main boundary for routine spares.

Listed on Amazon as: Z4C Spark Plug Aftermarket Replacement Parts Fit for 49cc 50cc 66cc 70cc 80cc 2 Stroke Engine Motorized Bicycle Bike Moped Scooter Yamaha JOG50 90 ZX50 QJ50 DX100… (1 pcs)

#5

5. JRL Spark Plug

• Core Material: Platinum
• Top Material Type: Metal
• Compatible with Vehicle Type: Two-Stroke Engine Bicycle and Bike
• Thread Size: 10mm-14mm

Best for: Two-plug two-stroke spare.

Why it ranks #5: A two-piece option explicitly intended for 49cc, 60cc, 66cc, and 80cc two-stroke motorized bikes; its listed thread range is 10mm–14mm.

A two-piece supply is the JRL plug’s clearest practical distinction, giving motorized-bike owners a spare alongside the replacement for a listed 49cc, 60cc, 66cc, or 80cc two-stroke engine. Its 10mm–14mm thread range is also stated, making thread-size checking part of the selection process rather than a guess.

The two-plug quantity lets owners keep a second replacement available after installing the first, useful when maintaining a motorized bicycle within the listed engine range. JRL specifies 49cc, 60cc, 66cc, and 80cc two-stroke applications, while the 10mm–14mm thread range provides a dimension to compare with the engine’s requirements. The listing also gives a 1.2-centimeter gap size, adding another check for buyers matching the plug to their setup.

Skip it if you need an exact M14x1.25 specification; amavoler’s Z4C listing states that specific thread size.

This JRL pair suits riders maintaining a listed 49cc–80cc two-stroke bicycle who want a spare included. Check both the engine’s thread requirement and the stated gap, since the supplied thread specification is a range.

Listed on Amazon as: JRL 2pcs Spark Plug For 49cc 60cc 66cc 80cc 2 Stroke Engine Motorized Bicycle Bike

#6

6. SING F LTD Z8C

• Core Material: Alloy Steel
• Top Material Type: Ceramic
• Compatible with Vehicle Type: ATV, Motorcycle
• Thread Size: 14mm

Best for: Heat-transfer Z8C pair.

Why it ranks #6: Includes two Z8C plugs for 48cc, 70cc, and 80cc two-stroke motorized bikes, with a stated 14mm thread and 67mm length.

The Z8C pair uses a high-melting-point electrode, a feature the listing says can prolong service life, making it a fit to consider for owners of listed 48cc, 70cc, or 80cc two-stroke bikes. Steel and ceramic construction is also described as supporting heat transfer and electrical insulation.

SING F LTD identifies this Z8C for 48cc, 70cc, and 80cc two-stroke motorized bikes, giving buyers a defined displacement list to check. Its high-melting-point electrode is linked in the listing to longer service life, while steel and ceramic are described as aiding heat transfer and electrical insulation. The 14mm thread and 67mm overall plug length provide concrete dimensions for replacement planning, and the listing says the old plug is easy to replace.

Skip it if you need stated fitment for a 49cc or 66cc engine; FLYPIG’s Z4C lists both sizes.

Consider this Z8C pair for a listed 48cc, 70cc, or 80cc two-stroke bike when the electrode construction and dimensions suit your replacement needs. Its stated displacement fitment is narrower than some Z4C alternatives.

Listed on Amazon as: SING F LTD 2pcs Z8C Spark Plug Suitable for 2 Stroke 48cc 70cc 80cc Motorised Motorized Bike Bicycle ATV Quad Bike Part Dirt Bike Parts Electric Bike Parts

#7 · Best Three-Prong Option

7. CDHPOWER Z4JC

• Core Material: Copper
• Top Material Type: Copper
• Compatible with Vehicle Type: Go Kart, Scooter, Bicycle
• Thread Size: M4x1.25

Best for: Three-prong 80cc motor.

Why it ranks #7: The two-plug listing specifies a three-prong Z4JC for 66cc/80cc two-stroke gas motorized bicycles, but gives an unusual M4×1.25 thread listing to verify.

Three prongs give this CDHPOWER Z4JC its defining configuration, with the listing describing a large fire-breathing area for 66cc and 80cc two-stroke motorized bicycle engines. The two-plug set adds a spare for owners maintaining those listed bicycle motors, while its unusual M4x1.25 thread specification calls for careful matching.

The three-prong layout and stated large fire-breathing area distinguish this plug from conventional listings, and CDHPOWER specifically identifies it for 66cc and 80cc two-stroke bicycle motors. Two plugs in the set allow one to remain available as a replacement. The product details specify M4x1.25, a critical dimension to compare with the engine before installation; the narrow stated engine fitment means it is not the broadly listed 49cc–80cc Z4C option.

Skip it if you need listed 49cc-to-80cc coverage; QAZAKY’s five-plug Z4C set states that wider range.

This CDHPOWER set is for owners of listed 66cc or 80cc two-stroke bicycle motors seeking a three-prong plug and a spare. Treat the specified M4x1.25 thread as a key fit check before choosing it.

Listed on Amazon as: 2PCS High performance 3 Prong Spark Plug M4×1.25, Z4JC for 2 stroke engine kits 66cc/80cc gas motorized bicycle

#8

8. Jstpure Spark Plug

Best for: Five-plug 2-stroke supply.

Why it ranks #8: Its title identifies five plugs for 50cc, 60cc, 66cc, and 80cc two-stroke motorized bikes, but the supplied specifications omit dimensions and plug model.

A five-plug quantity is the clearest detail in this Jstpure listing, giving motorized-bike owners several replacements for the stated 50cc, 60cc, 66cc, and 80cc two-stroke engine range. The title specifically identifies motorized bicycles, making the intended use clear even though detailed plug dimensions are not provided.

The five-piece quantity lets a rider keep multiple replacement plugs available for the listed 50cc, 60cc, 66cc, and 80cc two-stroke motorized-bike engines. That supply can support future maintenance without requiring a new purchase for each replacement. The listing names the application and quantity, but provides no thread size, plug model, or other dimensions in its supplied specifications. Buyers therefore have less dimensional information here for matching the plug to an existing engine than with listings that state thread measurements.

Skip it if you need thread dimensions before ordering; amavoler’s Z4C listing specifies an M14x1.25 thread.

This Jstpure pack suits a motorized-bike owner seeking five plugs for a listed 50cc, 60cc, 66cc, or 80cc two-stroke engine. Its limited specification detail makes it a weaker choice when exact thread dimensions guide selection.

Listed on Amazon as: For 5x Spark Plug For Motorized Bicycle Bike 50cc 60cc 66cc 80cc 2 Stroke Engine

#9

9. amavoler A7TC

• Core Material: Platinum, Iridium or Nickel
• Top Material Type: Iridium
• Compatible with Vehicle Type: ATVs, Dirt Bikes, Go Karts, Scooters, Quad 4…
• Thread Size: M10x1.0 or M10x1.25

Best for: GY6 four-stroke range.

Why it ranks #9: The A7TC is described for GY6 engines and vehicles including ATVs and scooters, rather than specifically for a two-stroke motorized bicycle.

GY6 fitment through 150cc is this A7TC plug’s clearest distinction, covering a listed range of 50cc, 70cc, 90cc, 110cc, 125cc, and 150cc engines. It also names ATVs, dirt bikes, go-karts, scooters, and quads, making it relevant to buyers beyond motorized bicycles with two-stroke engines.

The A7TC is listed for GY6 engines from 50cc to 150cc, including several intervening sizes, so it gives buyers a broader stated displacement range than the two-stroke bike plugs. Its compatibility list extends to ATVs, dirt bikes, go-karts, scooters, and quad four-wheelers, supporting use across those vehicle categories. The M10x1.0 or M10x1.25 thread specification is essential for checking fit, and the single-plug supply suits a one-at-a-time replacement.

Skip it if you have a 49cc–80cc two-stroke bicycle engine; FLYPIG’s Z4C listing names that application range.

Consider this amavoler A7TC for a listed GY6 ATV, scooter, dirt bike, or other named vehicle when its thread specification matches. It is not the listed choice for the common 49cc–80cc two-stroke bicycle range.

Listed on Amazon as: A7TC Spark Plug Fit for GY6 50 cc 70cc 90 cc 110cc 125 cc 150cc ATVs Dirt Bikes Go Karts Scooters Quad 4 Wheeler Pit Bike Dune Buggy Sandrail Moped Roketa Taotao Etc .(1 pcs)

#10

10. X-PRO NGK C7HSA

• Core Material: Copper
• Top Material Type: Metal
• Compatible with Vehicle Type: Motorcycle, ATV, Off-road Vehicle
• Thread Size: 10mm

Best for: NGK horizontal-engine option.

Why it ranks #10: Its C7HSA fitment focuses on 50cc–150cc horizontal engines, ATVs, and GY6 mopeds; it does not establish fit for the target two-stroke bike.

The NGK C7HSA designation is the defining detail of this X-PRO plug, which is listed for 50cc–150cc horizontal-engine ATVs, dirt bikes, go-karts, and mopeds. Its 10mm thread gives buyers a concrete fit dimension, while the stated GY6 applications extend across several engine sizes.

X-PRO identifies the NGK C7HSA for 50cc–150cc horizontal engines and specifically names GY6 50cc, 125cc, and 150cc applications. This helps owners of the listed ATVs, dirt bikes, go-karts, and mopeds compare engine type and size before replacing a plug. The copper core and 10mm thread are useful specifications to check against the existing setup. Its application is aimed at horizontal-engine vehicles, rather than being listed as a general two-stroke bicycle plug.

Skip it if you need a plug listed for a 49cc–80cc two-stroke bicycle; JRL’s two-plug set names that engine type.

This X-PRO plug suits owners of listed horizontal-engine ATVs, dirt bikes, go-karts, or mopeds who need an NGK C7HSA with a 10mm thread. Check engine type and thread before selecting it for a replacement.

Listed on Amazon as: X-PRO NGK C7HSA Spark Plug for 50cc 70 cc 90cc 110 cc 125cc 150 cc ATV Dirt Bike Go Kart Scooter Mopeds Pit Bike Dune Buggy Quads 4 Wheelers Roketa Taotao Jonway SSR Coolster Sunl