This article will provide instructions on how to install and mount your Unlimited motor(s) on your rear truck. For additional help articles, visit Unlimited Support.
Proper motor installation is a critical step in getting your Unlimited setup ready to ride, and regular safety checks are an important part of maintaining your vehicle.
WARNING: Improper installation can result in damage to the motors, loss of throttle and braking control while riding, and other safety hazards!
Damage resulting from improper installation or failure to inspect your motor axle nuts regularly is NOT covered under warranty.
- For Solo and Cruiser Kits, determine which side of your truck you'd like to place your motor. While this comes down to personal preference, we recommend mounting the motor on your heel side for maximum traction.
- Remove the nut on the appropriate axle of your back truck and place a single washer (speed ring), followed by the conical spacer provided in your kit.
- The conical spacer acts as a locking mechanism when your motor is tightened on the truck, keeping your motor in place while riding.
- Next, place the motor onto the truck axle with the green protective plate facing outwards.
- Connect the cable from the motor to the cable extending from the core (motor controller). Line up the logos on both cables to ensure they connect correctly.
- Serrated lock washers are no longer included with kits and completes. Designed to fit between the motor and the axle nut for added security, these optional washers are recommended only on truck axles long enough to allow the entire nut to engage with the threads. If the serrated washer prevents the nut from fully threading on your axle, please omit the washers from installation.
- Place your axle nut into the provided skate tool, then insert into the motor cavity while your board is upside down. Flip your board sideways to help guide the nut onto the axle and begin tightening.
- Before tightening all the way down, note the orientation of the cable coming out of the motor. The cables should be aligned with the face of the truck hangar to avoid abrasion from debris. To maintain this angle, place your thumb on the cables while tightening down the axle nut.
- To ensure your axle nut has been tightened to the correct torque, remove the stick (socket for truck mounting hardware) from your skate tool and attach the torque bar that is included in your kit.
- Tighten the axle nut until the metal rod in the torque bar moves from one side to the other. If you’re using an aftermarket torque wrench, set it to 25 N-m or 18 ft-lbs.
- For Race Kits, repeat Steps 2-9 above to install your second motor on the other truck axle.
- Be sure to regularly check your axle nuts before riding to ensure they are tightened down properly to avoid motor slippage.
If you have difficulty removing a stubborn motor from the axle, a few taps from a soft rubber mallet can help dislodge it. This is perfectly safe and will not damage your motor or truck in any way; just tap all around the motor's circumference until it releases and avoid hitting the bearings.
A small percentage of truck hangers have cross-sections too large to fit our motors and are thus not compatible. The motor must slide onto the axle all the way and seat properly against the hanger.
The photo below shows approximate dimensions for the motor's inner diameter (15/16") and insertion depth (3/4"). The cable shoulder adds around 1/32" to 1/16" of additional thickness at that angle.
By taking measurements on your trucks and comparing with these dimensions, you can estimate compatibility with the motor.