Stator Coil & Flywheel – 50cc-140cc (YX140 type)

Stator Magneto Coil & Flywheel Set for 50cc–140cc Pit Bikes – AC 12V alternator

Upgrade your pit bike’s electrical system with this high-performance Stator Magneto Coil & Flywheel Set, designed for use with most horizontal lay-flat pit bike engines, including popular brands like YX, Lifan and Loncin. Whether you're riding on the road or off the beaten track, this AC stator delivers consistent output for reliable ignition and lighting performance.

Ideal for pit bikes, dirt bikes, monkey bikes, and on and off-road motorcycles running 50cc to 140cc engines with a standard size flywheel (86mm ID).

Key Features:

• ✅ 12V AC Stator – Provides strong, consistent power for ignition and lighting
• ✅ 100% Copper Windings – Durable and efficient for long-term use
• 🔧 Copper Wire Diameter: 1mm
• 🔧 Wire Length: 400mm
  
• 🔧 Coil Face OD: 83mm
• 🔧 Flywheel Outer diameter: 110mm
• 🔧 Flywheel Inner diameter: 86mm
• 🔧 Wire Length: 400mm
• 🔧 Shaft Hole: 18mm
• 🔧 Screw Hole Centres: 102mm
• 🔧 Screw Hole Size: 6mm
• 🔧 Back Plate OD: 115mm
• 🔌 5 Bullet Connectors – Standard plug type for easy wiring
• 🧰 Includes: Outer O-ring + 1 x shaft seal

Fitment Compatibility:

• ✅ Suitable for:

  • 50cc–140cc horizontal engines

  • Pit bikes, dirt bikes, and monkey bikes using a standard 86mm inner diameter flywheel

• ❌ Not compatible with:

  • Electric start engines

Wiring Diagram / Colour Code:

• ⚫🔴 Black/Red – CDI power input

• 🔵⚪ Blue/White – CDI timing trigger

• 🟢 Green – Earth/ground

• 🟡⚪ or 🟡🟡 Yellow & White (or Yellow x2) – To regulator/rectifier for lighting/charging battery, etc.

Diagnostic Tips – Is Your Stator the Issue?

Use a multimeter to test your stator before replacing:

1. Pickup Coil Resistance Test

• Set to 2000Ω

• Test Blue/White to Green

• ✅ Reading: 100Ω+ | ❌ If: 0, OL, or unusually low

2. Power Coil Voltage Test

• Set to 20V AC

• Test Black/Red to Green

• Kick-start the bike

• ✅ Reading: 3V+ spikes | ❌ If: No output or very low reading

⚠ Important Notice: Electrical components cannot be returned once fitted or altered. Please ensure compatibility before purchasing.