Description
Overview:
The Piston Pin - Robin Part - RB521 25004 00 is a hardened, precision-ground steel pin that links the piston to the connecting rod at the small end. Often called a gudgeon pin, it carries high combustion loads while allowing smooth pivoting movement, helping the engine run reliably and efficiently. Built for use in small petrol engines commonly found in construction and garden machinery, it suits equipment such as plate compactors, generators, pumps, lawnmowers and tillers. Manufactured to tight tolerances in line with OEM intent, it provides a dependable replacement during an engine refresh or full rebuild. A clean, accurate finish and eased edges help with installation and reduce the risk of galling, supporting long service life when used with the correct lubrication and new circlips where specified.
Key Features:
- Precision-ground diameter for correct running clearance and low friction
- Hardened steel construction for excellent wear resistance and load bearing
- Smooth, deburred ends to aid assembly and protect piston bosses
- Built to match OEM form and fit for RB521 25004 00
- Stable performance under heat and shock loads typical of small engines
- Supports consistent compression, starting, and power delivery
- Suits small-end bush or needle bearing designs as used by many Robin engines
- Straightforward to fit with standard workshop tools and a service manual
- Helps reduce downtime during scheduled maintenance or overhauls
- Reliable choice for both trade and DIY engine repairs
Typical Applications:
Used in Robin-type small petrol engines powering construction and landscaping equipment. Common in plate compactors on site work, portable generators for power supply, water pumps for dewatering, and garden machinery such as mowers and cultivators. Ideal when refurbishing engines with piston slap, small-end wear, or during preventative maintenance to restore smooth operation and extend engine life.
Also known as:
Gudgeon pin, wrist pin, piston wrist pin, small-end pin, piston pivot pin. These terms all refer to the same part that connects the piston to the connecting rod and allows the small end to articulate during engine operation.
Product Specifications
| L&S Part No. | RB521 25004 00 |
|---|---|
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Robin |
| Key Features | - Precision-ground for correct running clearance and low friction - Hardened steel for wear resistance and load bearing - Matches OEM form and fit for RB521 25004 00 - Suits small-end bush or needle bearing designs - Smooth, deburred ends aid assembly and protect piston bosses |
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