Hobbywing EZRun 4278SD 2250Kv Black G2R 1:8 Sensored Motor

The Hobbywing EZRun 4278SD 2250Kv Black G2R 1:8 Sensored Motor (part number HW30402141) is a sensored, brushless 4‑pole unit built for 1/8 scale applications. With a 2250KV rating and support for 3–6S LiPo power, it offers a robust specification in a 42mm diameter, 78mm length can with a 5mm shaft.

This G2R variant comes in a black finish and is specified at 465g. The motor uses front and rear bearings sized D16×D5×T5 and D11×D5×T5 respectively. Suggested compatibility includes the Hobbywing EZRun MAX8 G2S ESC, and 1/8th trucks and monster trucks, as indicated by the manufacturer. Please check your model’s requirements for sizing, mount pattern, gearing and power system before installation.

Key dimensions and electrical ratings are outlined below to help with planning your power system and chassis layout.

Specifications

• Scale: 1/8th
• Brushed/Brushless: Brushless
• Sensored/Sensorless: Sensored
• Pole Count: 4
• KV Rating: 2250KV
• LiPo Cells: 3–6S
• No-load Current (A): 5.3A
• O.D. (mm): 42
• Length (mm): 78
• Shaft Diameter (mm): 5
• Weight (g): 465g
• Front Bearing: D16×D5×T5
• Rear Bearing: D11×D5×T5
• ESC: EZRun MAX8 G2S
• Vehicles: 1/8th Truck, Monster Truck