Finding the best spark plug for your motorized bicycle can make a huge difference in starting performance, throttle response, and overall engine reliability. Options like the JRL Z4C spark plugs and FLYPIG Z4C replacements offer dependable ignition for 49cc–80cc 2-stroke engines, while full upgrade kits such as the High Performance CDI + Coil + Spark Plug combos deliver a complete boost in spark strength and smoother acceleration. Whether you need a simple plug replacement or a full ignition upgrade, the list below covers the top choices trusted by riders.
Table of Contents
JRL 2pcs Spark Plug For 49cc 60cc 66cc 80cc 2 Stroke Engine Motorized Bicycle Bike
- Spark Plug Fits 49cc To 80cc 2 Cycle Engine Motorized Bicycle Pack Of 2
- Package Include:2pcs Spark Plugs
- Size:Bolt Diameter:1.2cm Length:6.5cm
- Weight:90g
- Please check for the details and make sure this is the right one you need.
High Performance CDI Ignition Coil + Magneto Coil + Spark Plug for 49cc-80cc 2-Stroke Engine Motorized Bicycle Bike
- Fits: 50cc-80cc 2-Stroke Engine Motorized Bicycles.
- Our high-quality units are the exact replacement for many brands and models of Mopeds, ATVs, Bicycles and Scooters.
- Match up exactly with original equipment in perfect fitness, just replace and ride again, easy to install.
- Package includes: 1 x Magneto coil. 1 x CDI ignition coil(with mounting parts). 1 x spark plug.
- High quality products with competitive price, fast delivery and good service, free shipping and shipped from USA warehouse.
QAZAKY 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
- ✪ 100% brand new and high-quality spark plug.
- ✪ Model: Z4C.
- ✪ Fits: 49cc – 80cc 2-stroke engine motorized bicycles. For numerous small gas engines in the 49cc, 66cc, 70cc, and 80cc displacement range.
- ✪ Compatible with Many Chinese and Japanese 49cc-80cc 2-stroke Moped Scooters like Yamaha JOG50 90 ZX50 DIO50 Suzuki AG100 QJ50 DX100 AX100 CJ750 etc.
- ✪ All of the original “QAZAKY” parts are backed by 180 days’ carefree return, BUY WITH CONFIDENCE!
HIAORS High Performance CDI Ignition Coil Magneto Coil Spark Plug Kit for 49cc-80cc 2-Stroke Engine Motorized Bicycle Bike
- Fits: 50cc-80cc 2-Stroke Engine Motorized Bicycles.
- Package includes: 1 x Magneto coil. 1 x CDI ignition coil(with mounting parts). 1 x spark plug.
- Match up exactly with original equipment in perfect fitness, just replace and ride again, easy to install.
- Please check the size of your original one for matching before purchase
2PCS High performance 3 Prong Spark Plug M4×1.25, Z4JC for 2 stroke engine kits 66cc/80cc gas motorized bicycle
- Package Including 2 pcs Spark Plug for 2-Stroke Engine 80CC Gas Motorized Bicycle
- This high performance 3 Prongs Spark Plug M4X1.25, marked Z4JC is for 2 Stroke 80cc Bicycle Motors
- With big Fire-breathing area
- Any questions,please contact us firstly! we can help you solve the problem until you are satisfied.
FLYPIG Z4C Spark Plug for 49cc 50cc 60cc 66cc 70cc 80cc 2 Stroke Engine Motorized Bicycle Bike Moped Scooter （2pcs）
YOFMOO 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
- Brand new aftermarket spark plug.
- Model: Z4C.
- Fits: 49cc – 80cc 2-stroke engine motorized bicycles. For numerous small gas engines in the 49cc, 66cc, 70cc, and 80cc displacement range.
- Compatible for Many Chinese and Japanese 49cc-80cc 2-stroke Moped Scooters like Yamaha JOG50 90 ZX50 Honda DIO50 Suzuki AG100 QJ50 DX100 AX100 CJ750 etc.
- 【NOTE】We provide 90-DAY MONEY BACK GUARANTEE & 1 YEAR WARRANTY. We guarantee to REFUND your money or REPLACE if you encounter any problems with it.
QAZAKY CDI Ignition Coil Spark Plug for 49cc 50cc 60cc 66cc 70cc 80cc 2-stroke Engine Motorized Bicycle Bike
- ✪ Original high quality brand new ”QAZAKY” parts, 100% tested before sending out.
- ✪ Fits: 49cc-80cc 2-stroke Engine Motorized Bicycles.
- ✪ Replaces existing stock ignition coil, this coil will increase the spark, improve combustion and the overall electrical performance.
- ✪ Package includes: 1 x CDI ignition coil(with mounting parts). 1 x spark plug.
- ✪ All of the original “QAZAKY” parts are backed by 180 days’ carefree return, BUY WITH CONFIDENCE!
BH-Motor CDI Ignition Coil & Spark Plug for 50cc 66cc 80cc Engine Motor Motorized Bicycle Bike
- CDI Ignition Coil & Spark Plug Fits for 49cc to 80cc Motorized Bicycle Bike
CNCMOTOK High Performance Kit CDI-Ignition-Coil Magneto Coil Spark Plug for 49cc-80cc 2-Stroke Motor Engine Motorized Bicycle Bike
- 100% brand new and high-quality magneto coil and CDI ignition coil spark plug. Compatible with 49cc-80cc 2-Stroke Engine Motorized Bicycles.
- Our high-quality units are the exact replacement for many brands and models of Mopeds, ATVs, Bicycles and Scooters.
- Match up exactly with equipment in perfect fitness, just replace and ride again, easy to install.
- Package includes: 1 x Magneto coil. Aluminum exterior to prevent rust.1 x CDI ignition coil(with mounting parts). Thick copper wire is easy to start. 1 x spark plug.Enhance higher concentration and easy ignition.
- High quality products with competitive price, fast delivery and good service, free shipping and shipped from USA warehouse.CNCMOTOK provide carefree return.
Buying Guide: How I Evaluate Spark Plugs & Ignition Kits for Motorized Bicycles
When I choose a spark plug or ignition kit for a 49cc–80cc 2-stroke motorized bicycle, I consider several key factors to make sure it improves reliability, performance, and longevity.
1. Spark Plug Compatibility
- The most common plug for these engines is Z4C, a standard 2-stroke spark plug that works in typical motorized bicycle engines.
- For high-performance setups, consider 3-prong spark plugs, which can give a more stable and powerful spark.
2. Ignition Kit vs. Plug Only
- Plug-only replacements (like JRL, Flypig, YOFMOO) are ideal if your CDI, coil, and magneto are still in good shape.
- If you’re experiencing weak spark, poor throttle response, or starting issues, a full ignition kit (CDI + coil + spark plug) can rejuvenate the system effectively.
3. Quality of CDI / Coil
- Higher quality kits often provide stronger and more consistent voltage, which translates to better ignition, stronger spark, and improved firing under load.
- Some kits include a magneto for a full system rebuild — useful for older or used motors.
4. Durability & Build Material
- Look for well-built ignition coils with strong insulation to withstand heat and vibration.
- Spark plugs should be made from quality materials; cheap plugs can foul faster or degrade under high-stress riding.
5. Bundle Value vs Single Items
- Buying packs of spark plugs (like 5-packs) is cost-efficient if you service or rebuild often.
- Full kits offer better value when doing a complete refresh rather than piecemeal upgrades.
6. Installation & Tools Required
- Installing a spark plug is straightforward with a standard socket wrench.
- Installing a full ignition kit may require additional wiring, coil mounting, and timing — make sure you have basic tools and mechanical skill.
7. Performance Gains
- Upgrading to a performance plug or ignition kit often improves throttle sharpness, idle stability, and overall responsiveness.
- If you’re running other upgrades (big bore kits or high-performance exhaust), a stronger ignition system helps maximize these upgrades.
8. Maintenance Cycle
- Regular spark plug maintenance (inspect, clean, gap) ensures optimal performance.
- When reinstalling a used plug, check for signs of wear or fouling as this may indicate a larger issue (fuel mixture, lubrication, etc.).
9. Heat Range & Gap
- Verify the correct heat range for your engine to avoid fouling or overheating the plug.
- Ensure the gap specification is correct; some high-performance ignition kits might need a slightly different gap than stock.
10. Brand Reliability
- Stick with reputable brands or kits designed specifically for small 2-stroke engines — this avoids compatibility issues or poor quality components.
Comparison Table
| Product | Type | Key Features | Best For |
|---|---|---|---|
| JRL 2pcs Spark Plug | Spark Plug | Z4C type, fits 49cc–80cc 2-stroke engines | Basic replacement with solid performance |
| High Performance CDI + Coil + Spark Plug Kit | Full Ignition Kit | Strong spark output, better throttle response | Full upgrade for weak or old ignition |
| QAZAKY 5pcs Z4C Spark Plug | Spark Plug Pack | Bulk pack, compatible with many mopeds & scooters | Mechanics or frequent riders needing multiples |
| HIAORS CDI + Coil + Magneto + Plug Kit | Complete Ignition Kit | Magneto included, strong & stable spark | Restoring non-starting or weak engines |
| 3-Prong Spark Plug (2pcs) | Performance Plug | M4×1.25, 3-prong design for cleaner ignition | Riders wanting stronger and more reliable spark |
| FLYPIG Z4C (2pcs) | Spark Plug | Standard Z4C, reliable for most 2-stroke engines | Affordable, consistent performance |
| YOFMOO Z4C Plug | Spark Plug | Fits 49cc–80cc bikes & many scooters | Long-lasting, widely compatible replacement |
| QAZAKY CDI + Coil + Plug | Ignition Kit | Better spark stability, easy install | Improving starting & acceleration |
| BH-Motor CDI + Plug | CDI Kit | Compact kit, dependable spark | Budget ignition upgrade |
| CNCMOTOK High Performance CDI-Coil-Magneto Kit | Performance Kit | Complete setup with magneto | Maximum ignition refresh & strong spark |
FAQ
What spark plug type is best for motorized bicycles?
Most 49cc–80cc 2-stroke bicycle engines use Z4C-type spark plugs, which offer reliable firing and easy replacement.
Is a 3-prong spark plug better than a standard plug?
A 3-prong plug can offer more consistent ignition and improved combustion, but standard Z4C plugs work perfectly for everyday riding.
Should I replace just the spark plug or the entire ignition kit?
If your bike is hard-starting, misfiring, or losing power, upgrading to a CDI + coil kit is often the best solution.
How often should a spark plug be replaced?
Every 300–500 miles depending on riding conditions. If you see oil fouling or carbon buildup, replace sooner.
Do all these spark plugs fit all 49cc–80cc bicycle engines?
Yes—every product listed fits the standard 2-stroke Chinese motorized bicycle engine platform.