Maytech Watercooled 85165 Motor+Waterproof 300A ESC +MTSKR1905WF Remote + MTS2009AS Anti-spark Switch + 12V 30W Water Pump Set for Electric Jetboard/Jetski/Motorized Surfboard/ Efoil /Hydrofoil Efoil/Esurf/Boat Kit
Upgraded Notice Since July 29, 2022.
1. Internal receiver type: upgrade with waterproof junction box for wirings and default 1m antenna, more convenient to use, if you don't want to 1m antenner or want longer antenna (we also have 3m), please leave note when make order.

2. No receiver type: upgrade with waterproof junction box as below picture:


Different Options:
1. MTI85165-200-SF+MTSF300A-WP (Internal or External Receiver)+MTSKR1905WF
2. MTI85165-200-SF+MTSF300A-WP (Internal or External Receiver)+MTSKR1905WF+Water Pump Set
3. MTI85165-200-SF+MTSF300A-WP (Internal or External Receiver)+MTSKR1905WF+MTS2009AS Anti-spark Switch
4. MTI85165-200-SF+MTSF300A-WP (Internal or External Receiver)+MTSKR1905WF+MTS2009AS Anti-spark Switch+Water Pump Set
-Motor: MTI85165-SF Watercooled Sensorless Inrunner BLDC Motor
Model No.: MTI85165
KV: 200KV, can be cutomize, contact us
Shaft: Screw Shaft / Keyway Shaft
Input Volt: 6-12S Lipo (25V-50V)
Max Current: 300A
Max Output Watt: 10.5KW
Max Torque: 15.5N.m
Motor Size: 65x162mm
Indle Current: @8.4V no load: 2.1A
Hall Sensor: Without



-ESC: MTSF300A-WP Waterproof & Watercooled 300A ESC Speed Controller Internal/ External MTSRR1905 Receiver
Model No.: MTSF300A-WP
Cont Current: 300A
Max Current: 1000A
Waterproof Rank: IP68 Waterproof
Watercooling: Yes, with
Input Volt: 6-14S Lipo (24V-58.8V)
BEC: Internal with 18-75V convert to 5V DC-DC Module
Signal Format: PWM (PPM)
Signal Output: 1-2ms
Case Material: Alloy aluminum case
Connector: Standard is 8.0mm golden female connector on motor cable side, battery size is not with connector, with IP68 waterproof case for connector.


How to choose ESC Version?
1) MTSF300A-WP with Internal Receiver: Can only work with Maytech remote MTSKR1905WF, the wiring had been wired by our engineer, more convenient to use.
If you put the ESC near the top of your board and can lead the receiver terminal out of water, then you can choose this version.
(Standard lead out antenna length is 10cm, we also have 1m antenna and 3m antenna, if you need to put longer antenna into the ESC, please order the antenna length you need here: 1m/3m Antenna , leave a note that you want to put longer antenna into ESC)
2) MTSF300A-WP No receiver: Can work with other receiver and remote, more flexible. If you will put the ESC at the bottom of your board and underwater, suggest to choose this version.
Questions You May Ask:
- Can I put the ESC underwater directly? Is it ok to work in sea water?
--Yes, the ESC is with waterproof case, you can put underwater directly, it can use work in sea water, but because sea water has corrosion, to expand the ESC lifespan, please use fresh water to clean the sea water on the surface, and put the ESC for all dry for next time use.
- I don't want to put the ESC underwater directly, what should I do?
--If you don't want to put the ESC underwater, don't worry, it's also watercooled, you just need to connect a water pump to cooling the ESC.
PS: The antenna terminal must be lead out of water, so please choose suitable version according to your needs.

Progcard Manual and Instruction:
-Remote: MTSKR1905WF IP67 Waterproof Remote for Esurf, with PWM & UART Receiver
Item | MTSKR1905WF (V2) |
Waterproof Rank | IP67 Waterproof with 2 Layers Nanometers Coating |
Control Mode | Esk8/Esurf |
Signal | PWM (PPM) |
Double Source Power Supply | Accept 5V power by ESC built in BEC or extra 5V power |
Firmware Updatable | Yes |
Control Pump | Yes (Relay Switch) |
Control Light | Yes (Transistor Switch) |
Set Safety Button | Acceptable |
Brake Button | Yes |
Cruise Control | Yes, in Esurf mode |
Wireless Charging | Yes |
Accessories | Charging Pad; Receiver; 3pcs Dupont Cables |


-Water Pump Set: MTWP30A+MTUBEC6.12 12V 30W Water Pump Set with Power Supply
-MTS2009AS 300A 80V Anti-spark Switch (Can cut off positive pole power)
Model No. |
MTS2009AS |
Max Current |
300A |
Max Voltage |
25V-80V |
Connector | With 4pcs Cold-pressed Terminal Connector |
Function | Protect your controller and power supply system when brake or startup |
Features |
First Switch that can cut off positive pole power in the market; |
Application | Electric surfboard, efoil, foilboard, jetski, jetboard, jetsurf, motorized hydrofoil, motorcycle, fighting robots, lawnmower robot, Electric mountainboard, ATV, motor bike, etc., |
Advice for Usage:
1. To expand the products life, please better wipe off the waters on the products and keep them for all dry after everytime use.
2. For this kit of the ESC, because the motor is sensorless, suggest to use the default value in the ESC, we have tested the kit before shipment with the default value, do not suggest to modify the values.
About Stock:
1. Standard stock for the motor is screw shaft, 200KV, if you need to other KV or another shaft, lead time is about 40-60 days after your order confirmed, and please contact us agnes@maytech.cn to tell us your requirement.
2. The standard stock is also limited, please confirm your order asap, and if you need very urgent, please contact us agnes@maytech.cn to check stock first.
3. The ESC waterproof case and inner circuit are handmade by our engineer, it will be start make after your order confirmed, takes about 5-10 days after your order confirmed, but the material are limited, so please better confirm your order earlier.
Any other questions and requirements, contact us agnes@maytech.cn
Related Products: Click the folloing picture to check more details:
Maytech Fully Waterproof Efoil Kit: MTI65162 + MTSKR1905WF + MTSF300A-OPTO-WP:

Waterproof / Watercooled Esurf Kit with 18.8KW 120116 Motor + 300A ESC + MTSKR1905WF