HENGJIAN S3-Z300-21-4 Starter Relay Overview
The HENGJIAN S3-Z300-21-4 starter relay is an original-type electrical component specified for Hengjian S8-Z300 motorcycles, designed to restore dependable electric starting performance.
As part of the starting circuit, this relay switches high current from the battery to the starter motor when the start button is pressed, helping the engine crank quickly and reducing load on the handlebar switch and wiring harness.
Key Features
- OEM-style starter relay developed for Hengjian S8-Z300 off-road motorcycles.
- Ensures reliable power transfer from the battery to the starter motor for confident engine cranking.
- Direct replacement design for the original relay, supporting straightforward installation and wiring connection.
- Suitable for regular use in mixed on-road and off-road conditions where frequent starts are required.
Technical Details
| Brand | HENGJIAN |
| Manufacturer part number | S3-Z300-21-4 |
| Reference code | 1044929 |
| Component type | Starter relay (starter solenoid), starting system electrical component |
| Primary function | Controls high-current power feed from the battery to the starter motor during engine start |
| Associated vehicle category | Hengjian S8-Z300 motorcycle parts > Electrical component |
| Condition | New |
Typical Symptoms Indicating Relay Replacement
- Pressing the starter button does not crank the engine and the starter motor remains inactive.
- Intermittent starting, where the engine only cranks occasionally despite a charged battery.
- Audible clicking from the relay area without the starter motor engaging.
- Visible burn marks, melting, or heavy corrosion on the existing relay terminals or housing.
Typical Use Cases
This starter relay is intended as a direct-replacement component when restoring the electric start function on Hengjian S8-Z300 is typically installed after diagnosing a no-crank issue, during an electrical system overhaul, or as part of a preventive refresh on machines that see regular off-road or training use.
Replacing a worn or unreliable relay helps maintain consistent engine starting behaviour, supports battery health by avoiding repeated failed start attempts, and contributes to overall reliability of the motorcycle's electrical system.
Compatibility
The S3-Z300-21-4 starter relay is listed within the dedicated Hengjian S8-Z300 parts range as an electrical component of the starting system.
| Brand | Model | Year |
| Hengjian | S8-Z300 | — |
