HOBBYWING EZRUN 1/6TH SL 4985-1250KV MOTOR (BLACK) HW30402951

Overview

The Hobbywing EZRUN 1/6th SL 4985-1250KV Motor (Black) HW30402951 is a high-performance brushless electric motor engineered for serious 1/6th and 1/7th scale RC car enthusiasts. This professional-grade motor combines blazing speed with exceptional durability, making it the ideal choice for competitive racers and experienced hobbyists looking to upgrade their RC vehicles. Whether you're pushing your brushless RC car to its limits on the track or exploring demanding terrain, this 1250KV motor delivers the responsive acceleration and rock-solid stable output that separates winning setups from the rest. The EZRUN 4985 represents the pinnacle of Hobbywing's motor engineering, with technology proven across thousands of RC cars worldwide.

Built for drivers who demand the absolute best in performance and reliability, this sensorless brushless motor has been designed to handle instant full-torque start-ups for wheelies, high-speed racing on straightaways, and powering through the bumpiest terrain without hesitation. If you're serious about RC car performance in the UK and want a motor that combines lightning-fast acceleration with uncompromising durability, the EZRUN 4985-1250KV is the motor for you. This is not a beginner's motor—it's engineered for experienced drivers who understand the demands of competitive RC racing and want professional-grade equipment.

The 1250KV rating makes this motor ideal for 3S to 8S LiPo battery configurations, offering flexibility across multiple driving conditions and power levels. Hobbywing has invested considerable engineering into every aspect of this motor, from the CNC-machined aluminium case to the precision-engineered rotor, ensuring that you get maximum performance and longevity from your investment.

Key Features

• 1250KV Rating for Explosive Acceleration — The 1250KV rating delivers rapid motor response and exceptional power delivery, making this brushless motor perfect for drivers who want quick torque on demand. This KV rating is optimised for 3S through 8S LiPo batteries, giving you flexibility in how you power your RC car.
• Sensorless Brushless Technology — This motor uses advanced sensorless technology that eliminates the need for internal sensors, reducing weight and complexity whilst maintaining smooth, reliable operation. Sensorless design is proven technology trusted by competitive RC racers across the UK.
• Industry-Leading 90% Efficiency Rate — Hobbywing's temperature control technology ensures that the motor runs cooler and more efficiently than competing designs. A 90% efficiency rating is industry-leading, meaning more of your battery's energy goes directly into propelling your RC car rather than being wasted as heat.
• CNC-Machined Hard Anodised Aluminium Case — The motor housing is precision-engineered from aluminium and hard anodised for superior durability and heat dissipation. This professional-grade construction protects the motor from impact damage whilst allowing heat to escape efficiently, keeping temperatures under control even during extended high-performance driving sessions.
• Ultra-Thin Silicon Steel Laminations — The rotor uses ultra-thin laminations that reduce iron losses and electromagnetic resistance, directly contributing to the motor's exceptional efficiency and responsive feel. This is precision engineering you'll feel the moment you drive.
• Heat-Resistant Oxygen-Free Double Insulated Windings — The motor windings are double-insulated with heat-resistant material and oxygen-free copper, providing maximum durability and thermal protection. This construction prevents winding degradation even when the motor is pushed hard, ensuring your investment lasts for years of competitive driving.
• High-Quality Japanese Bearings — Front and rear bearings are sourced from Japanese manufacturers known for precision and longevity. These bearings ensure smooth, low-friction rotor rotation and minimal axial play, contributing to the motor's responsive handling and long operational life.
• Explosion-Proof Rotor with Strong Structure — The rotor is engineered with a reinforced structure that can withstand the stresses of rapid acceleration and high RPM operation. This design prevents rotor failures even under extreme driving conditions.
• High-Quality Polished Alloy Steel Output Shaft — The output shaft is manufactured from premium polished alloy steel, providing excellent durability and straightness. A precision shaft ensures reliable power transmission with minimal runout.
• Compatible with EZRUN MAX6 ESC — This motor pairs perfectly with the Hobbywing EZRUN MAX6 electronic speed controller. When matched together, the ESC and motor create an excellent combination delivering large torque, smooth linear power delivery, and responsive acceleration control.
• 4-Pole Brushless Motor Design — The 4-pole configuration provides optimal balance between efficiency and power output, making this motor suitable for both racing and recreational driving applications.
• 6.5mm Male Bullet Connectors — The motor features standard 6.5mm male bullet connectors, ensuring compatibility with most modern ESCs and allowing easy installation into your RC vehicle.
• Easy Installation with M4 Mounting Screws — Installation is straightforward using four M4 mounting screws (not included) with a maximum length of 10mm. This compact mounting system fits most 1/6th scale RC chassis designs.

Technical Performance

The Hobbywing EZRUN 4985-1250KV motor combines exceptional engineering with field-proven reliability. Measuring just 49mm in diameter with a compact 86.5mm length and featuring a 5.0mm bore shaft, this motor delivers a remarkable power-to-size ratio. At only 636 grammes, it maintains the lightweight construction necessary for responsive handling whilst incorporating the robust materials required for sustained high-performance operation. The motor's compact dimensions make it ideal for tight engine bays in modern 1/6th and 1/7th scale RC cars, allowing proper cooling airflow whilst maintaining a low centre of gravity. The 5.0mm diameter output shaft provides a secure connection point for spur gears and pinions, transferring power reliably even during aggressive acceleration. With a no-load current draw of just 5.2 amps at full throttle, this motor operates efficiently, reducing demand on your battery and ESC whilst delivering consistent power throughout your driving session. The motor accepts 3S through 8S LiPo battery configurations, making it adaptable to different driving styles and vehicles. Front and rear bearings use D19×D6×T6 specifications (Japanese precision standards), ensuring smooth, low-friction operation with minimal side play. The brushless design with 4 poles ensures smooth commutation and responsive power delivery without the maintenance requirements of brushed motors. This is professional-grade engineering that rewards skilled driving with immediate throttle response and predictable power characteristics. The sensorless architecture simplifies installation whilst maintaining the performance consistency that competitive drivers demand from their RC equipment.

What's in the Box

• Hobbywing EZRUN 4985-1250KV Brushless Motor (Black) with 6.5mm bullet connectors

What You Need to Complete

• EZRUN MAX6 Electronic Speed Controller (recommended)
• 3S to 8S LiPo battery pack
• Battery charger compatible with your LiPo battery
• Four M4 mounting screws (maximum 10mm length) for installation
• RC vehicle chassis compatible with 1/6th scale motors

Frequently Asked Questions

• Is the Hobbywing EZRUN 4985-1250KV suitable for beginners? — This is not a beginner's motor. The 1250KV rating delivers significant power, and this sensorless brushless motor requires an ESC and battery system, making it best suited for experienced RC drivers who understand electronics and car setup. If you're new to RC, consider starting with a ready-to-run system before investing in upgrade motors like this one.
• What battery does the EZRUN 4985-1250KV need? — This motor is compatible with 3S through 8S LiPo batteries. A 3S LiPo (11.1V) configuration provides moderate power, whilst higher cell counts like 6S or 8S deliver progressively higher speeds and power output. Most competitive drivers use either 6S or 8S configurations for optimal performance with this motor.
• Which ESC should I pair with this motor? — Hobbywing specifically recommends pairing the EZRUN 4985 with the EZRUN MAX6 electronic speed controller. This ESC has been engineered to work seamlessly with this motor, delivering excellent torque characteristics, smooth linear power delivery, and responsive acceleration control. The ESC and motor combination creates a setup that punches significantly above its weight in terms of performance.
• How efficient is this motor compared to competitors? — The EZRUN 4985 achieves an industry-leading 90% efficiency rating through Hobbywing's temperature control technology and precision engineering. This means more of your battery's energy translates into acceleration and speed rather than wasted heat. Higher efficiency also means cooler operation and extended runtime.
• What is the difference between the 1250KV and 1650KV versions? — The 1650KV motor (model HW30402950) delivers higher maximum RPM and is designed for 3S to 6S batteries, making it suitable for ultra-high-speed applications. The 1250KV version offers more torque and accepts up to 8S batteries, making it more versatile across different battery configurations and driving styles. Choose 1250KV for balanced performance across multiple battery types, or 1650KV for pure top-speed racing applications.
• Can I use this motor with a different ESC? — Technically, this motor can work with other quality brushless ESCs that accept 6.5mm bullet connectors and support brushless sensorless motors. However, Hobbywing specifically recommends the EZRUN MAX6 pairing, as this combination has been engineered together for optimal performance. Other ESCs may function but may not deliver the same smooth linear power characteristics.
• How much does this motor weigh? — The EZRUN 4985-1250KV weighs 636 grammes (22.4 ounces), making it lightweight enough for responsive handling whilst maintaining the robust construction necessary for high-performance driving. This weight is typical for professional-grade 1/6th scale motors.
• What maintenance does this brushless motor require? — Brushless motors like this one require minimal maintenance compared to brushed alternatives. Periodically check that the motor cooling fins remain clear of dirt and debris, and ensure connections remain clean and corrosion-free. Beyond these basic steps, the sensorless brushless design requires virtually no user maintenance, allowing you to focus on driving rather than upkeep.
• Is this motor waterproof? — The motor itself is not specifically rated as waterproof. Whilst the CNC-machined aluminium case provides some weather protection, you should avoid submerging this motor or exposing it to heavy water spray. Use common sense when driving in wet conditions, and rinse components with fresh water after saltwater environments to prevent corrosion.

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. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. 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 1/6TH SL 4985-1250KV MOTOR (BLACK) HW30402951 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.