1. Powertrain and Electrical System

The biggest differences between MY23–24 and MY25 are in the motor, controller, and battery.

Motor

• MY23–24 motor: 11100-YQ5A-Z1 (or 11100-YQ5A-00B0 without side logo cap)
• MY24–25 motor: 11100-YQ5A-Z2 (or 11100-YQ5A-11B0) — not compatible with MY23
• Treat MY23 as its own generation. MY24 and MY25 share the updated motor spec.

Controller

• MY23–24 controller: 21100-YQ5A-Z1 / 21100-YQ5A-11B0
• MY25 controller: 21100-YQ5A-Z3 / 21100-YQ5A-22B0 — not compatible with MY23–24
• Always match controller generation to the bike model year group.

Battery and Charger

• MY23–24 battery: 26000-YQ5A-0000
• MY25 battery: 26000-YQ5A-0200
• The MY23–24 battery can cause overcurrent issues if installed on MY25.
• The MY25 battery can be installed on MY23–24 — slightly increases range, same power output.
• Charger 21700-YQ5A-0200 is listed for all model years and can be used across MY23–25.

Main Harness and Power Cabling

• Main harness (24100-YQ5C-0000) and communication cable are ALL MY — shared across all model years.

2. Midshaft and Primary Belt Drive

• MY23–24 midshaft: 61280-YQ5A-Z1  |  MY25 midshaft: 61280-YQ5A-Z2
• The MY25 midshaft is not compatible with the old version unless the MY25 belt and pulley are also installed.
• MY23–24 rear primary pulley: 13202-YQ5A-0000  |  MY25: 13202-YQ5A-0100
• MY23–24 belts: 13111-YQ5A-0000 (Conti) / 13111-YQ5A-0200 (Gates)  |  MY25 belt: 13111-YQ5A-0300 (Dyco)
• Treat the pulley, belt, and midshaft as a matched set. If you change one, change the whole group to MY25 spec.

3. Frame, Suspension and Chassis

• Frame brackets, battery supports, and bushings are labeled ALL MY.
• Swingarm has separate MY23–24 and MY25 color listings; internal hardware is shared.
• Linkage, triangular cantilever, skid plate, footpegs, side stand, bearings, and seals are common across all years.
• Seat options (standard and low) are compatible with all versions including MY25.

4. Wheels and Tires

• Front wheel assemblies, hub, axle, and spacers are all ALL MY.
• Rear wheel assemblies (18" and 19" MX options) are ALL MY — run either wheel size on MY23–25.
• Rear sprocket, brake disc, wheel bearings, and axle hardware are shared across model years.

5. Brakes and Handlebar Controls

Braking System

• Front and rear brake system assemblies are split by year, but MY25 systems are compatible with earlier bikes as a complete assembly swap.
• Calipers, pads, hoses, and most small brake hardware are shared or compatible across MY23–25.

Handlebar Switches

• Throttle, handlebars, clamps, and grips are shared across model years.
• Right and left combination switches have separate MY23–24 and MY25 part numbers and are not compatible with the old version. Match the combination switch to your bike's model year.

Shared Components — All Ultra Bee Years

• Main frame structure and subframe (different color codes only)
• Seat and seat height options, swingarm hardware, wheel spacers, drivetrain guards
• Linkage, triangular cantilever, and rear shock
• Front fork assemblies and protectors
• Front and rear wheel hubs, most bearings, brake discs, and sprockets
• Dashboard, headlight, key switch, USB port, and most lighting hardware
• Most plastic fenders, covers, and universal fasteners