HOBBYWING EZRUN 3665SD 4000KV BLACK G3 SENSORED MOTOR HW30402608

Overview

The Hobbywing EZRUN 3665SD 4000KV BLACK G3 Sensored Motor represents the latest generation of high-performance brushless motors for 1/10 scale RC trucks, truggies and monster trucks. This is a sensored motor that builds on Hobbywing's reputation for reliability and performance, delivering the power and precision demanded by both competitive racers and enthusiastic bashers across the UK. The G3 generation represents a significant evolution in sensored motor technology, with improvements that translate directly into better throttle control, reduced heat output, and increased efficiency compared to the previous G2 generation.

Whether you're upgrading an existing RC truck or building a high-performance setup from scratch, this brushless RC motor is engineered to deliver consistent, predictable power across a wide range of driving conditions. The 4000KV rating sits perfectly in the sweet spot for 2-3S LiPo power, making it suitable for short course trucks, truggies and monster trucks where a balance between speed and acceleration is desired. The sensored design ensures that throttle response is smooth and linear, giving you precise control during technical maneuvers, power wheelies, and high-speed driving across any terrain.

Hobbywing has invested heavily in the core engineering of this motor, utilising premium materials and tight tolerances throughout to ensure longevity and reliable performance session after session. The improved waterproof sensored cable interface and upgraded sensored mode deliver motor temperature protection, whilst perfectly matching modern Hobbywing ESCs like the EzRun MAX10 G2. For anyone looking for a quality brushless motor for their 1/10 scale RC vehicle in the UK, this motor delivers exceptional value and proven performance.

Key Features

• Sensored brushless design — This motor incorporates high-precision Hall sensor components that continuously monitor and report rotor position, ensuring accurate output that is always consistent and predictable, which results in excellent linearity and significantly improved throttle control compared to sensorless alternatives.
• 4000KV rating — With a KV rating of 4000, this motor is perfectly suited for 2-3S LiPo battery systems, delivering the optimal balance of speed and torque for short course trucks, truggies and monster trucks, whilst keeping power delivery manageable and controllable.
• 3% efficiency improvement over G2 — The G3 generation achieves noticeably better overall efficiency than the previous G2 motor, meaning more of the electrical energy from your battery is converted into useful mechanical work, resulting in less wasted heat and longer runtimes from the same battery capacity.
• 5% increase in maximum output power — Compared to G2 motors, the G3 generation delivers 5% more maximum output power, giving you additional punch for acceleration, hill climbing and general performance without requiring a step up to a higher KV rating.
• Advanced motor temperature protection — The upgraded sensored mode includes intelligent temperature monitoring that protects the motor from overheating under sustained high-load conditions, automatically managing performance to keep the motor within safe operating parameters.
• Waterproof front bearing — The front bearing is waterproof, providing protection against mud, water and wet conditions, which is essential for off-road RC driving in the UK where wet and muddy terrain is commonplace.
• High-precision bearings — Front and rear bearings are precision-manufactured to tight tolerances, ensuring smooth, low-resistance rotation and contributing to both the efficiency and reliability of the motor.
• Premium materials throughout — The motor casing, ultra-thin silicon steel sheets, high-temperature-resistance copper wire, explosion-proof rotor and high-tolerance alloy shaft are all carefully selected and approved by Hobbywing engineers to ensure extraordinary long-term performance.
• IP-67 waterproof rating — The entire power system achieves IP-67 waterproof and dustproof protection, meaning you can confidently drive through mud, sand, water, snow and ice without risk of damage to the motor.
• Modular detachable structure — The motor features a clever modular design that allows for easy disassembly and daily maintenance, helping to prolong the motor's lifespan and keeping it operating at peak efficiency without requiring specialist tools or knowledge.
• Compatible with EzRun MAX10 G2 ESC — This sensored motor perfectly matches modern Hobbywing ESCs like the EzRun MAX10 G2, ensuring seamless integration and optimised performance when paired with compatible speed controllers.
• Smooth and reliable operation — The combination of precision bearings, optimised bearing covers with smaller structure and reduced internal resistance means the motor operates smoothly and reliably, session after session.

Technical Performance

The Hobbywing EZRUN 3665SD 4000KV G3 is a 1/10 scale brushless sensored motor built to exacting standards using premium engineering and materials. The motor measures 37mm in diameter and 65.8mm in length, with a 5mm shaft diameter compatible with standard 1/10 scale RC truck drivetrain components. At just 297 grams, it offers an excellent power-to-weight ratio that won't compromise handling or suspension performance. The sensored design delivers four-pole brushless performance with high-precision Hall sensor components that ensure accurate rotor position feedback for smooth, linear throttle control. Operating on 2-3S LiPo battery systems, this 4000KV motor draws a maximum no-load current of 8.2 amps, making it suitable for use with appropriately rated ESCs and power systems. The front bearing is specified as D16x5mm with 5mm thickness, whilst the rear bearing measures D11x5mm with 5mm thickness, both featuring precision construction for low-resistance operation. The motor uses 4.0mm male bullet connectors as standard. When compared to the G2 generation, this G3 motor achieves 3% greater overall efficiency and 5% higher maximum output power, whilst operating at significantly reduced temperatures under the same load conditions. The premium construction materials including ultra-thin silicon steel sheets, high-temperature-resistance copper wire and explosion-proof rotor design ensure this motor will deliver consistent performance through many hours of competitive racing or recreational bashing across all weather and track conditions. The IP-67 waterproof system guarantees excellent protection against water ingress and dust contamination, making it ideal for UK off-road RC driving where wet and muddy conditions are inevitable.

What's in the Box

• Hobbywing EZRUN 3665SD 4000KV G3 Sensored Brushless Motor
• Sensored motor cable with waterproof connector interface

What You Need to Complete

• Hobbywing EzRun MAX10 G2 ESC or compatible Hobbywing brushless ESC
• 2-3S LiPo battery pack (minimum 50C discharge rating recommended)
• LiPo battery charger
• Motor pinion (check your vehicle manual for correct size)
• Motor mount and adaptor hardware (specific to your vehicle)

Frequently Asked Questions

• Is the Hobbywing EZRUN 3665SD 4000KV sensored motor suitable for beginners? — Yes, absolutely. The sensored design actually makes this an excellent choice for newcomers to RC because the Hall sensor feedback delivers smooth, linear throttle response that is much more forgiving and predictable than sensorless motors. You'll find it easier to control during learning and it's less prone to spool-up glitches. The 4000KV rating provides a good balance of speed and power that won't overwhelm inexperienced drivers.
• What battery does this motor need? — The EZRUN 3665SD 4000KV is compatible with 2-3S LiPo battery systems. A 3S LiPo will deliver maximum performance, whilst a 2S system will provide slightly more controlled, easier-to-manage power delivery. We recommend using a 50C or higher discharge rating battery to ensure you're not limiting the motor's potential through battery resistance.
• How does the G3 generation compare to the G2? — The G3 generation offers three significant improvements over G2: it achieves 3% better overall efficiency, delivers 5% higher maximum output power, and operates at much lower temperatures under the same load conditions. These improvements mean faster lap times, longer runtimes from the same battery, and improved reliability through reduced heat stress on the motor windings.
• Can I use this motor in wet or muddy conditions? — Yes, the IP-67 waterproof rating and waterproof front bearing make this motor well-suited for UK off-road conditions. The waterproof sensored cable interface ensures that mud, water and moisture won't compromise performance. This rating means the motor can handle mud, sand, water, snow and ice without damage.
• What ESC should I pair with this motor? — Hobbywing recommends pairing this sensored motor with the EzRun MAX10 G2 ESC for optimal performance and compatibility. The G3 motor is specifically designed to work seamlessly with modern Hobbywing ESCs that support sensored operation. Ensure your ESC has a sensored input and is rated for your chosen battery voltage.
• Is this motor suitable for Short Course Trucks, Truggies and Monster Trucks? — Yes, this 3665 motor variant is specifically designed for Short Course Truck, Truggy and Monster Truck applications. The 65.8mm length and larger bearing sizes distinguish it from the 3652 variant and make it the correct choice for these larger 1/10 vehicles.
• What makes sensored motors better than sensorless? — Sensored motors use Hall effect sensors to detect rotor position, allowing the ESC to deliver perfectly timed commutation pulses. This results in smoother acceleration, better throttle linearity, less cogging, reduced current draw during startup, and more predictable power delivery. Sensored motors are preferred for precision driving and racing applications.
• How much does this motor weigh? — The EZRUN 3665SD 4000KV weighs just 297 grams, making it lightweight enough for 1/10 scale trucks without adding excessive unsprung weight that would compromise handling and suspension performance.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the HOBBYWING EZRUN 3665SD 4000KV BLACK G3 SENSORED MOTOR HW30402608 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction.