Description
Overview:
The Piston for Robin EX21 Engines is a precision-machined component that restores and maintains correct compression and smooth running in small petrol engines. Made from durable aluminium alloy to keep weight low and heat transfer high, it is built to handle repeated thermal cycles and the stresses of everyday use. This piston is tailored for Robin EX21 single-cylinder engines commonly found in compact construction and garden machinery. It follows the original specification referenced by OEM No. RB277 23401 03 for form and fit, helping ensure reliable sealing with the cylinder and consistent performance after overhaul. Suitable for professional workshops and DIY users alike, it is a straightforward replacement choice for keeping EX21-powered tools operating efficiently.
Key Features:
- Direct-fit replacement for EX21 engines, matching OEM form and dimensions
- Aluminium alloy construction for strength-to-weight efficiency and good heat dissipation
- Precision ring grooves to support correct compression and oil control when used with the matching ring set
- Machined skirt and crown profiles to promote smooth operation and reduced friction
- Built to withstand high temperatures and repeated load cycles in daily service
- Helps restore power, starting performance, and fuel efficiency in worn engines
- Compatible with standard EX21 service procedures for straightforward fitting
- Suitable for scheduled overhauls or corrective repairs to extend engine life
- Supports reliable sealing with the cylinder when installed to specification
Typical Applications:
Used in Robin EX21 engines powering generators, plate compactors, water pumps, pressure washers, and other light plant and garden equipment. Ideal for engine rebuilds where loss of compression, scoring, or wear is present, helping return the machine to dependable service in rental fleets, site work, landscaping, and domestic maintenance.
Also known as:
EX21 piston, piston assembly for EX21, cylinder piston, engine rebuild piston, replacement piston for Robin EX21, small engine piston for compactors, generators, and pumps.
Fits Models:
EX21
Alternate Part Numbers:
RB277-23401-03, RB2772340103
Product Specifications
| L&S Part No. | RB277 23401 03 |
|---|---|
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Robin |
| Key Features | - Direct-fit replacement for Robin EX21 engines - Aluminium alloy for strength and heat dissipation - Precision ring grooves for correct compression - Machined profiles reduce friction and promote smooth operation - Withstands high temperatures and repeated load cycles |
| Fits Models | EX21 |
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