Overview
Upgrade your 1/18 scale RC crawler with the INJORA Fat Viper 2204 2400KV Outrunner Brushless Motor & Aluminum Transmission Set. Designed specifically for TRX4M platforms, this combo delivers exceptional torque, smooth low-speed control, and silent operation. Compatible only with the INJORA 370 transmission and MBL32 ESC, this motor-transmission setup is a perfect match for high-performance 3S builds, offering enhanced responsiveness and durability on any terrain.
Key Features
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2204 2400KV sensorless brushless outrunner motor for compact crawlers
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Smoother, quieter, and more powerful than traditional brushed setups
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Optimized for INJORA 370 aluminum transmission (not stock-compatible)
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Compatible with INJORA MBL32 ESC only (not for use with stock ESC)
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Strong aluminum housing and stainless steel gears for longevity
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32% underdrive ratio for superior crawling control and torque
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PH2.0 3-pin connector, plug-and-play with supported systems
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Recommended for 3S LiPo setups for maximum performance
Motor Specifications
| Parameter | Value |
|---|---|
| Model | Fat Viper 2204 |
| KV Rating | 2400KV |
| Motor Type | Sensorless Outrunner |
| Poles | 14 |
| Max Power | 2500W |
| No-load Current | 0.7A |
| Max Peak Current | 50A |
| Output Shaft Diameter | 2mm |
| Pinion Gear | 0.4 Mod 11T |
| Connector | PH2.0 3-Pin |
| Dimensions | Φ28 x 19.2mm |
| Weight | 28g |
Transmission Specifications
| Parameter | Value |
|---|---|
| Housing Material | Aluminum |
| Gear Material | Stainless Steel |
| Internal Gear Ratio | 24.4:1 |
| Underdrive Ratio | 32% |
Compatibility Notes
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✅ Compatible with: INJORA 370 Aluminum Transmission, INJORA MBL32 ESC
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❌ Not compatible with stock TRX4M transmission or ESC
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🔋 Recommended: 3S LiPo battery for high torque and responsiveness
What's Included
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1x INJORA Fat Viper 2204 2400KV Outrunner Motor
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1x Pre-installed 11T Pinion Gear
- or 1x INJORA Aluminum Gear Transmission (24.4:1, 32% underdrive)






INJORA Fat Viper 2204-2400KV motor with dimensions: 19.2mm height, 28mm width.





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