YZ125 Electric start (2005-2021)

(1 customer review)

$1,275.00 USD$1,345.00 USD

EAN: N/A SKU: YAM03-000 Category: Tags: , , ,


This is a bolt on electric starter kit for the Yamaha YZ125. It comes with everything you need to convert your motorcycle to electric start except for the battery which we cannot ship internationally. It comes with a battery box ready to receive an Antigravity 401 or SC-1 battery and includes the complete wiring.

The housing is made of billet aluminum and the gears of solid hardened steel. The kit comes with a new flywheel central section that you will rivet to your oem magnetic flywheel section and keep running the original ignition.

This YZ 125 electric starter kit includes:

  • Aluminum billet cover
  • Main ring gear
  • Crown gear
  • Intermediate gear
  • General bearings
  • Bolting shaft
  • Gaskets and hardware
  • Electric motor
  • Battery box (battery not included)
  • Harness
  • Relay
  • Push button

The complete kit with lithium battery will add 5 lb.

This unit is for now sold without charging stator, as one battery charge can fire the bike 200 times without needing a charge.

Carbon fiber guard should be available as an option later on.

Tools required

  • 3/8 drive Socket ranch
  • Socket ranch extension
  • 10mm socket
  • Phillips drive bit
  • Yamaha M27x1 flywheel puller
  • 6mm allen drive bit
  • 5mm allen drive bit
  • 4mm allen drive bit
  • 60-150 in-lb torque wrench
  • ½ drive torque wrench

Main steps installation

  1. Battery box and wiring installation
  2. Flywheel and main gear installation
  3. Starter housing installation
  4. Starter and battery connection
  5. Tank and seat re-install



It is recommended to flush the oil after the first ride to eliminate particles generated by the gears first meshing and break in. Taking cover off to remove all particles is recommended versus only using the drain plug.

On a normal basis, change the oil at the same time as transmission oil.

Warranty Items

All merchandise manufactured by Panthera Motorsports has a warranty against manufacturing defects for a period of one (1) year from the date of original shipping. (See details)


Tired of kicking?! Convenient and light, our electric starter won’t let you behind if you have to restart the bike in the heat of the moment. It will be your valuable asset especially on muddy enduro courses.

Additional information

Weight 10 lbs
Dimensions 27.94 × 27.94 × 27.94 in
Carbon fiber guard

No carbon fiber guard, Carbon fiber guard

1 review for YZ125 Electric start (2005-2021)

  1. Michray (verified owner)

    This Electric start kit dramatically improves the startability of the YZ125 even when it is difficult to start with a kick pedal. and since my YZ125 is already set with a stator coil for power generation and wired so that it can be charged, the frequency of external charging is low, it is very comfortable and I hardly feel any increase in weight. I think it is a part that I would like many YZ125 owners to experience.

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