YZ250 (2003-2005) – electric start

$1,160.00 USD$1,825.00 USD

EAN: N/A SKU: N/A Category: Tags: , , , ,


yz250 flywheel inertia chart

This kit includes the following

  • Stator with lighting current *
  • Flywheel *
  • Electric motor
  • Main ring gear
  • Crown gear
  • Intermediate gear
  • General bearings
  • Bolting shaft
  • Gaskets and hardware
  • Aluminium cover
  • Battery box * (battery not included)
  • Harness *
  • Relay *
  • Current rectifier *
  • Push button *
  • Carbon fiber guard *
  • Optional

The electric start can be run on the oem flywheel without the charging system. The motorcycle will start around 200 times before needing a battery charge.

The complete kit with lithium battery will add 5.7 lb.

View YZ250 owner and install guide

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. 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?! 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 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


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