Description
Overview:
The Key 4.78mm for Honda GXH50 (GCAL) Engines, OEM No. 90741-ZM7-000, is a small but critical genuine Honda component used to locate and secure the flywheel on the crankshaft. Made from precision-machined, hardened steel, it ensures the correct alignment of the flywheel and maintains accurate ignition timing. In the event of a sudden shock load, this key is designed to shear to help protect more expensive engine parts. The 4.78 mm size is approximately 3/16 inch, matching Honda’s specification for the GXH50 platform. This genuine key is commonly required during flywheel removal, replacement, or after impact events that disturb timing. Suitable for Honda-powered machinery using the GXH50 (GCAL), such as smaller compactors, rammers, pumps and other light construction and garden equipment.
Key Features:
- Genuine Honda OEM part for accurate fit and function
- Size: 4.78 mm (approx. 3/16 in) to Honda specification
- Positively locates the flywheel on the crankshaft to maintain ignition timing
- Sacrificial shear design helps protect the crankshaft and flywheel under shock loads
- Hardened steel for durability and stable performance
- Direct replacement for OEM No. 90741-ZM7-000
- Helps restore correct timing after flywheel or impact-related issues
- Straightforward installation with standard workshop tools
Typical Applications:
Used in Honda GXH50 (GCAL) engines found in compactors, rammers, small generators, pumps, light construction tools and garden machinery. Ideal for routine engine service when the flywheel has been removed, or when misfiring and hard starting suggest a sheared or displaced flywheel key. Helps return the engine to reliable starting and smooth running.
Also known as:
Flywheel key, woodruff key, half-moon key, timing key, crankshaft key, keyway key, ignition timing key. These terms refer to the same locating key that fixes the flywheel’s position on the crankshaft to set correct ignition timing in small petrol engines.
Fits Models:
GXH50 (GCAL)
Alternate Part Numbers:
90741-ZM7-000, 90741 ZM7 000, 90741ZM7000
Product Specifications
| L&S Part No. | 90741 ZM7 000 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Honda |
| OEM No. | 90741-ZM7-000 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Honda |
| Fits Models | GXH50 (GCAL) |
Reviews
Ask a Question
Compatibility
Customers also bought
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£83.17 £69.31 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£83.68 £69.73
Related Products
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£83.17 £69.31 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£83.68 £69.73
