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22S NO PREP DRAG: 1/10 SCALE 2WD RTR • INSTRUCTION MANUAL
PRECAUTIONS
• Never touch moving parts.
• Never disassemble while the batteries are installed.
• Always let parts cool before touching.
GEARING
The vehicle is equipped with optimal gearing for 2S batteries. When using 3S batteries, Use
alternate gearing to optimize speed, power and efficiency.
Installing a pinion gear with fewer teeth or a spur gear with more teeth will increase torque
and reduce top speed. Likewise, a pinion gear with more teeth or a spur gear with fewer
teeth will reduce torque and increase top speed. Take care when installing larger pinion gears
as this can “overgear” the vehicle, resulting in an overheated motor and ESC. When testing
different gearing options, pay close attention to the temperature of the motor and speed
control to ensure you are operating within the correct temperature range. If the motor is too
hot, switch to a lower pinion gear and/or higher spur gear combination.
CAUTION:
Do not touch the ESC or motor after use or personal injury may result.
Do not allow the ESC or motor to exceed 160°F (71°C). A temperature gun (recom-
mended DYNF1055) can be used to safely monitor the temperature before handling.
CHANGING THE PINION GEAR/GEAR RATIO
1. Remove the screws holding the gear cover in place.
2. Loosen the set screw and remove the installed pinion gear.
3. Loosen the motor screws and slide the motor back.
4. Place the new pinion on the end of the motor shaft so the set screw is located
over the flat on the shaft.
5. Position it so the teeth line up with the spur gear and secure the pinion by tightening
the set screw.
6. Set the gear mesh.
SPEKTRUM 3652 4-POLE 6500KV BRUSHLESS MOTOR (SPMXSM2800)
SETTING THE GEAR MESH
The gear mesh has already been set at the factory. Setting it is only necessary when changing
motors or gears.
Proper gear mesh (how gear teeth meet) is important to the performance of the vehicle. When
the gear mesh is too loose, the spur gear could be damaged by the pinion gear of the motor. If
the mesh is too tight, speed could be limited and the motor and ESC will overheat.
1. Loosen the motor screws and slide the motor back.
2. Put a small piece of paper between the pinion and spur gears.
3. Push the gears together while tightening the motor screws.
4. Remove the paper. Check the mesh at 3–5 different locations around
the spur gear for a small amount of movement.
5. Install gear cover.
TROUBLESHOOTING GUIDE
PROBLEM
POSSIBLE CAUSE
SOLUTION
Vehicle does not operate
Battery not charged or plugged in
Charge battery/plug in
ESC switch not “ON”
Turn on ESC switch
Transmitter not “ON” or low battery
Turn on/replace batteries
Motor runs but wheels
do not rotate
Pinion not meshing with spur gear
Adjust pinion/spur mesh
Pinion spinning on motor shaft
Tighten pinion gear setscrew on motor shaft flat spot
Transmission gears stripped
Replace transmission gears
Drive pin broken
Check and replace drive pin
Steering does not work
Servo plug not in receiver properly
Make sure the steering servo plug is connected to the receiver steering channel, noting proper polarity
Servo gears or motor damaged
Replace or repair servo
Will not turn one direction
Servo gears damaged
Replace or repair servo
Motor does not run
Motor wire solder joint is damaged
Resolder the motor wire with the proper equipment
Motor wire broken
Repair or replace as needed
ESC damaged
Contact Horizon Hobby Product Support
ESC gets hot
Motor over-geared
Use smaller pinion or larger spur gear
Driveline bound up
Check wheels and transmission for binding
Poor run time and/or sluggish
acceleration
Battery pack not fully charged
Recharge battery
Charger not allowing full charge
Try another charger
Driveline bound up
Check wheels, transmission for binding
Poor range and/or glitching
Transmitter batteries low
Check and replace
Vehicle battery low
Recharge battery
Loose plugs or wires
Check all wire connections and plugs
