BadassBox Yamaha X Set for All Yamaha motors

The badassBox is attached to the speed sensor of the e-bike and overrides the 16 mph (25 km/h) speed limit - you can expect to reach speeds of up to 25 mph (40km/h) , depending on the bike and gearing. Your displayed speed will be 2 times slower than your real speed. We recommend the use of GPS-related accessories for a more precise data acquisition of driving data (smartphone, bike computer, etc.).

The tuning kit manipulates the speed signal without altering the motor's power relative to pedaling speed. This guarantees a smooth motor control without speed limit interruptions. Depending on a tuning kit, some determine when assistance stops, while others remove the restriction entirely for continuous support. However, the achievable speed mostly depends on the eBike model. Achievable speed can be calculated using a simple formula:

Speed = Cadence [rpm] * Wheel circumference [mm] * Front Chainring Teeth / Rear Chainring Teeth * 60 [min/h] / 1.000.000 [mm/km]

The contactless and wireless badassBox transmits a modified speed signal in order to override the speed limit of your e-bike – without interfering with the motor's electronic circuitry or software. There's no need to open the motor and there is no risk of damaging it, the BadassBox can be fitted or removed in seconds.

This tuning kit is made to fit bikes with Yamaha motors, where the speed sensor is integrated and the magnet is fixed on the brake disc. This tuning kit is not compatible with Yamaha YDX Moro US (American) eBike model



A quality product designed, engineered and manufactured by us in Germany. The assembly requires a small conversion. Please read the instructions before ordering!

If your speed sensor is on the chain stay and uses a spoke magnet that's not integrated into the brake disc, you need a different tuning kit -BadassBox 4 Yamaha

The delivery includes the following parts:
- one badassBox 4 Yamaha
- one badassBox 4 housing cover
- one AAA battery
- one spoke magnet with thumb screw
- one Universal Adapter
- a pad made of elastic foam
- one M5 nut
- one washer
- one cylinder screw
- four cable ties

The integrated sensor is located in the area of the dropout. To get to the sensor you have to dismount the rear wheel.



Find the position of the integrated sensor* in the dropout of your e-bike. *The sensor shape shown is an example.



Undo the screws of the bracket that holds the sensor* is fastened to the dropout. *The sensor shape shown is an example.

Fasten the Universal Adapter with cylinder head screw, washer and nut (included in delivery) to the sensor*. *The sensor shape shown is an example.



Now you can attach the Universal Adapter with mounted sensor* on the chainstay with supplied cable ties. *The sensor shape shown is an example.



Slide the badassBox onto the adapter until it clicks into place. Reinstall the rear wheel. Mount the spoke magnet and align it with the edge of the badassBox housing. That's it. Have fun with your faster e-bike!

Please note that the operation of this type of modified electric bikes on public roads may be against the law in some countries. The manufacturer takes no responsibility for damages resulting from the use of BadassBox products. Electric bikes equipped with BadassBox products are not allowed to be used on public roads, cycling paths and public places. Electric bikes equipped with BadassBox products can be used exclusively on private property and entirely at one’s own risk. The use of BadassBox products may void the warranty of your ebike.

We strongly recommend using other safety features and protective gear to prevent injuries in higher speeds.

BadassBox products are thoroughly tested and we stand by their quality - Badass Box provides 2 years warranty to all their products.

Warranty does not cover damage resulting from eBike software updates. Remove the tuning kit before updating the software. Check with us first to ensure the kit is compatible with your updated eBike. We cannot guarantee that the kit will function the same after updates. Please exercise caution.