YZ250 (2006-2021) – electric starter kit

(10 customer reviews)

$1,160.00 USD$1,825.00 USD

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yz250 flywheel inertia chart

This Yamaha YZ250 electric starter kit is available in charging and non-charging version:
– the charging version with it 90W charging system replace the stock stator and flywheel and will charge the battery in addition to allow accessories to be wired to the battery.
– the non-charging version will use the OEM flywheel and will start around 200 times before needing a charge (when using Antigravity 801 battery).

Recommended batteries are: Antigravity SC-1 (4 cells) or 801 (8 cells)

The complete kit with lithium battery will add 5.7 lb

This kit includes the following:

  • Machined billet housing aluminum, anodized black
  • Electric motor
  • Main ring gear
  • Crown gear
  • Intermediate gear
  • General bearings
  • Bolting shaft
  • Gaskets and hardware
  • Battery box (battery not included)
  • Harness 
  • Relay 
  • Push button
  • Carbon fiber guard *optional
  • Stator with lighting current *charging version
  • Flywheel *charging version
  • Current rectifier *charging version

View YZ250 owner and install guide

Tools required

  • General mechanics tooling
  • Yamaha M27x1 flywheel puller
  • 4, 5 and 6mm allen drive bit
  • 60-150 in-lb torque wrench
  • ½ drive torque wrench

Main steps installation

  1. Battery box and wiring installation.
  2. Panthera stator installation (for starter kit with charging system).
  3. Flywheel and main gear installation.
  4. Starter housing installation.
  5. Starter and battery connection.
  6. 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?! Boost your old YZ250 with our electric start (2nd generation).

Additional information

Weight 10 lbs
Dimensions 11 × 11 × 10 in
Charging system

No charging system, 90W DC Charging system

Wirings harness and battery box

Wiring and 8 cells battery box, Wiring and 4 cells battery box

Carbon fiber guard

No carbon fiber guard, Carbon fiber guard

10 reviews for YZ250 (2006-2021) – electric starter kit

  1. Anthony Guilhem

    Awesome eletcric start!

  2. Anthony Guilhem

    Awesome electric start!

  3. ramiro

    arranque yz 2t

  4. Nick Hibbert

    6 months of trouble free operation was a breeze to in stall!! Yz250x Highly recommend!!

  5. Ace Niño Gica

    I have been hesitant to try the product especially that we are in the philippines and sorting out the parts is not as easy as other countries. But i am just happy to give it a try. The product was pure plug and play and no issues after a 5 hour technical trail.

  6. Mick Joyce

    Absolutely perfect product, easy fitment, top quality workmanship, highly recommend for us older guys

  7. Karlos Karlorado (verified owner)

    Game changer! Works awesome and built very well. Had to take off the Magura Hydraulic clutch and put back OEM cable due to fitment. Very strong battery output.

  8. CRAIG SCHAEFER (verified owner)

    Absolutely love it! I have the new model with the improvements built in w(90 watt stator). Package shipped with a couple missing parts. I was headed to
    CO riding within a week and when I let Panthera know that they overnighted me the correct part. Cant say enough about the customer service. Immediate responses! I live in the US and ordered the battery with it. Was charged $80.00 to accept the package from UPS when it was delivered due to battery crossing customs. If you are a US resident you should probably buy a battery local but the starter is amazing. Cant say enough about Panthera and this starter!

  9. Alan Ewald (verified owner)

    One of my favorite parts on my bike. Really brings the yz Into 2021. The antigravity battery is by far the best I’ve used and the stator runs my fan and charged the battery. I’ve had zero issues with this setup. Good job panthera Expensive yet worth every penny when you compare a new beta or ktm

  10. Barazani Sahar (verified owner)

    My dream has come true!
    Thank a lot for Antoine
    Yz250x really recommend

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