Product overview
The Scorpion HK-2221 Motor Shaft Kit (FORZA450) supplies replacement shafts for HK-2221 and HK-2520 series helicopter motors used with the JR Forza. Its purpose is to replace a shaft bent or broken during a landing. The kit is described as using 4mm hardened steel shafts, while the JR Forza 450 shaft is separately specified as 5mm in diameter and 59mm long. These diameter descriptions leave a material ambiguity for motor integration.
Compatibility covers HK-2221 and HK-2520 motors that do not require a C-clip retainer, with additional fit stated for other brushless motors requiring a 4mm shaft of the same length. Installation involves a slight press fit in the motor’s aluminum front housing. Removing the setscrews alone will not free the shaft: extraction requires a bearing press or drill press, with the front housing supported in a block of wood to prevent warping. Weight including packaging is 30g.
Specifications
| Specification | Value & conditions |
|---|---|
| Product | Scorpion HK-2221 Motor Shaft Kit (FORZA450) |
| Shaft construction | 4mm hardened steel shafts |
| Replacement motor applications | Factory replacement shafts for all HK-2221 and HK-2520 series Scorpion Helicopter MotorsFor JR Forza use only. |
| Shaft diameter | 5mmFor the JR Forza 450. |
| Shaft length | 59mmFor the JR Forza 450. |
| Other motor fit | Fits other brushless motors requiring a 4mm shaft of the stated lengthOther brushless motors requiring a 4mm shaft of this length. |
| Retainer compatibility | Compatible with motors that do not require a C-clip retainerHK-2221 and HK-2520 motors that do not need the C-clip retainer. |
| Shaft fit | Slight press fitShaft installed in the aluminum front housing of a Scorpion motor. |
| Removal equipment and support | Bearing press or drill press required; removing the setscrews alone does not release the shaftDuring shaft removal, with the motor front housing supported in a block of wood to prevent warping. |
| Weight | 30gIncluding packaging. |
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