Sensored Brushless Motor
Thank you for purchasing the Justock-3650-G2 brushless motor(s) for RC cars! The high
power system can be very dangerous, so please read this manual carefully before using and
follow the operating procedures strictly. In that we have no control over the installation, use
and maintenance of this product, no liability shall be assumed nor accepted for damages,
losses or costs resulting from the use of this product. Besides, we own the right to change the
product design, appearance, functions and operational requirements without any
Assembly and Disassembly
C. at the
Pole Stock Rotor W (g) ApplicationsLiPo
STOCK/SPORT class (choose the motor as per
competition rules) of 1/10th, 1/12th On-road (i.e.
competition touring car or drift, F1, Mini car, and
etc.) and Off-road (i.e. buggy, 2WD SCT & truck)
racing, Normal Training, and Rock Crawlers
(21.5T & 25.5T only).
Notes: C. at the point of M.O.P. = Current at the point the Maximum Output Power.
1) The maximum output power is the test value obtained when the voltage is 7.4V, the ESC timing is set to 0°. It is neither the maximum input power nor the rated power. The calculation formula used here is:
RPM x Torque / 9550.
2) The value of the maximum output power is always lower than the value of the input power. Therefore, it’s meaningless to compare the maximum output power mentioned in the form above with the input power of
motors of other brands. Besides, values in the form above may differ from the test data of other factories because of different test benches.
3) The input current at the point of the maximum output power is useful for the load configuration and the ESC selection; here we strongly suggest users not make the load quota bigger than the “maximum output power
point”, that means please don’t make the input current larger than the current at the maximum output power point.
4) As the power of these motors is not big, so they are not applicable for 4WD / Monster trucks and other high weight and heavy load vehicles or games need very great power. If forcibly use them in those conditions,
perhaps they will get burnt. Hereby, we suggest users choose the 4-pole motor like XERUN-3656 when high power is needed.
It is very important to select the reasonable gear ratio, as inappropriate selection may cause great loss to users. Please
select the correct gear ratio according to the following points!
1. Operating Temperature of the Motor
During the operation, the motor temperature should be lower than 90℃ (194℉). Temperatures above 90℃ will
demagnetize the magnet & may melt the coils and eventually damage the ESC (because of strong current). Therefore,
the most effective way to prevent over-heat is to select the right gear ratio.
2. Principle of Gear Selection
To avoid potential risks, caused by overheating, which may lead to ESC/motor damage or malfunction, please start with
very small pinion and check ESC & motor temperatures frequently throughout a run. This is the only way to guarantee
that you are not causing excessive heating. If Motor and the ESC temperatures remain stable and low in the running,
then you can slowly increase the pinion (with more teeth) while again monitoring the temperatures to determine the
safe gearing for your vehicle and motor. Because the climate and track conditions always change, please keep
monitoring ESC & motor temperatures to protect your electronics from damage.
Vehicle Type Battery 10.5T 13.5T 17.5T 21.5T
Touring Car (for Small track) 7.4V LiPo 5.5:1 4.7:1 4.0:1 3.5:1
Touring Car (for Big track) 7.4V LiPo 5.0:1 4.0:1 3.5:1 3.0:1
1/12th Touring Car 3.7V LiPo 42mm 51mm 66mm 66mm
2WD Buggy 7.4V LiPo 8.0:1 7.0:1 6.0:1 5.5:1
4WD Buggy 7.4V LiPo 8.0:1 7.0:1 6.0:1 5.5:1
R2ZZ bearing, 3.175 x 9.525 x 3.967
For prolonging the motor life and raising its efficiency, we recommend users to check the bearing, and clean the motor regularly; and the specific interval depends on the usage frequency and
terrains. Please follow the assembly diagram below to assemble the motor, and disassemble in reverse order.
540 MOTOR BEARING-3.175
XERUN-V10 & Justock-G2-Rotor-7-12.5 Thin magnet , w/o cooling fan, magnet hole Ø7, O.D. of the magnet:12.5mm
R2ZZ bearing, 3.175 x 9.525 x 3.967mm
Replacement Part Part No. Product Name Specifications
XERUN-V10 & JUSTOCK-G2-Rotor-7-12.3-U Thin magnet / Strong Magnet, w/o cooling fan, magnet hole Ø7, O.D. of the magnet:12.3mm
3. Gear Ratio(s) Suggested
The below form shows some rough data about gear ratios (these recommended ratios are reference values
when setting the ESC to the Zero Timing Mode). If you don’t know how to set the suitable gear ratio, please
begin with a big ratio (i.e. small pinion) and then adjust as required, or consult with on-site drivers who are
using the same power unit for basic information.
Front end bell
1 2 3 4
5 6 7
mount rotor Dirt-proof silicon ring
Connect female gold connectors to male
Sensor board onto back end bell with screws
Screws for fixing the motor Motor assembledBack end bell
Screws for Fixing
the Motor x 3pcs
Motor Rotor x1pcs
Screws for fastening
the Sensor Board 3pcs
Dirt-proof Silicon Ring 1pcs
Sensor board 1pcs
Back End Bell 1pcs
Front end bell
sThe use of a heat-resistant magnet attached aluminum case and double insulated windings, high precision bearings, and rotor with a strong structure guarantees outstanding performance and super durability.
sThe built-in Hall sensor non-adjustable end bell combined with a high precision and balanced rotor guarantees the user a smooth and linear power on demand.
sThe silicon O-ring seal fitted between the end bell and stator helps to conduct inner heat to the motor case and prevent dust from entering the HALL sensor.
sCustomized 3.5mm low impedance banana connectors soldered to the motor wires guarantee easy use and firm connections between the ESC and motor.
sThe detachable structure design for daily cleaning and maintenance can effectively prolong the service life of this Justock motor and improve its operating efficiency.
sThis motor is perfectly matched with the XR10-Justock ESC for all zero timing spec racing and also compatible with other Hobbywing Electronic Speed Controllers including other brands.
sThis Justock motor is applicable to various 1/10th, 1/12th on-road & off-road vehicles. It can be an ideal choice for Stock or Sport class races but can also be a nice choice for newbies for practice.
sThe motor design is in compliance with IFMAR, and ROAR specifications.
This product is NOT a toy and it is for use by adults and teens over 14 only, so please keep it out of children’s
reach. Please keep the following points in mind; otherwise it may damage the product and cause property
loss and physical injuries to users.
sNever leave this product unsupervised when it is powered on. If any problem occurs, the product may cause a fire
and jeopardize peripheral devices.
sPlease check wire sequences between the ESC & the motor carefully before the connection, to avoid any possible mistakes.
sPlease insure all the wires and interconnecting pieces are well insulated before the connection, as short circuits may
damage the product.
sNever allow water, oil, fuel or other conducting liquids to get inside this product or other electronic parts, as these
liquids may contain harmful minerals for electrical circuits. If that really happens, please turn off the device
immediately, and then clear and blow-dry it carefully.
sPlease read through manuals of each power equipment (like ESC, motor, battery, etc) and chassis to ensure the
power system configuration is rational before the use, as the incorrect power system configuration may result in
overload and eventually damage the equipments.
sProhibit the full throttle operation before the pinion installation. Under non-loaded circumstances, over-high RPM
may cause damage to the motor.
sMake sure all the parts are well connected, as misconnection or poor connection may lead to abnormal control,
damage or other unpredictable problems.
sNever let the temperature of the motor can (shell) exceeds 90°C (194°F), otherwise the motor is likely to be
damaged and (or) the rotor will be demagnetized.
Installation & Connection
1. To Install the Motor
1) Screws used for installation are 3mm in diameter & 5mm in length. Before mounting the motor onto the vehicle, please
ensure that all the screws are applicable to avoid damaging the motor. In general it’s ok to adopt screws which are 3 mm in
diameter and less than 8mm in length; the specific length is up to the chassis size.
2. To Connect the Motor
1) Three power wires need to be connected to the motor, and they often differ in colors: Phase wire A is Blue, Phase wire B is
Yel lo w and P ha se wi re C i s Orange. P lease n ot e the E SC mark w hi le co nn ec ting ES C outpu t wi re s to moto r power w ires a nd
ensure connections are: A-A, B-B and C-C.
2) If you are using a sensored ESC, please insure Hall-sensor wires are clean and undamaged; then connect them in the correct
direction to the sensor ports of the motor & the ESC respectively. Warning: In such a case, the wire sequence of the ESC and
the motor must strictly follow the rules of A-A, B-B and C-C. Do not change the wires sequence.
3) While if the ESC is a sensorless one, then connect the motor and the ESC according to the above way may cause the motor
to rotate in the opposite direction, because definitions of phase (#A / #B / #C) are different among manufacturers, at this time
you only need to swap any of two wire connections.
Recheck the installation and all the connections carefully before turning on the power.