Product overview
The Scorpion HKII-4525 Shaft Kit XL (6mm 55mm) is a factory replacement shaft kit for HKII-4525 helicopter motors, supplied in the long shaft configuration. Its purpose is to replace a worn shaft or provide a shaft size suited to the model's installation. The HKII-45 series uses a 10mm hardened steel shaft, while this kit's pinion end is reduced to 6mm over a 55mm length. A flat spot provides the mounting provision for the required pinion.
Integration centers on the motor's aluminum front housing and the pinion connection. The shaft is a slight press fit, so removing the set screws alone will not release it. Removal requires an arbor press and a wooden support block beneath the front housing to prevent warping. The shaft can be shortened with a Dremel tool and cut-off wheel when necessary. Compatibility extends to earlier motors such as the HK-45 series, although minor modification may be required. Weight including packaging is 62g.
Specifications
| Specification | Value & conditions |
|---|---|
| Product identity | Scorpion HKII-4525 Shaft Kit XL (6mm 55mm) |
| Product code | HKII_4525_6_55 |
| Supplied configuration and intended motor | Long replacement shaft kit for HKII-4525 series motors. |
| Main shaft construction | 10mm hardened steel.HKII-45 series motor shafts. |
| Reduced shaft diameter | 6mmPinion end. |
| Pinion-end length | 55mmPinion end. |
| Pinion mounting provision | Flat spot for installation of the required pinion. |
| Length adjustment | Can be shortened using a Dremel tool and cut-off wheel.If a shorter shaft is necessary. |
| Shaft fit | Slight press fit.Installed in the motor's aluminum front housing. |
| Shaft removal requirement | Requires an arbor press; support the motor's front housing in a block of wood to prevent warping.After removal of the set screws. |
| Earlier motor compatibility | Compatible with earlier motor versions such as HK-45 series motors.Use with previous motor versions such as HK-45 series motors; some minor modification may be required. |
| Weight | 62gIncluding packaging. |
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