Description
Overview:
The Piston Assy-020 (OEM 499958) is a genuine Briggs & Stratton piston assembly designed to restore correct compression and dependable combustion in small petrol engines. Built from durable, heat-conductive aluminium alloy with a precision finish, it is engineered for consistent performance and long service life. The "-020" sizing indicates a +0.020 inch oversize (+0.51 mm), intended for use in cylinders that have been re-bored to suit oversize components after wear or scoring. Ideal for routine maintenance or a full engine refresh, it helps reduce blow-by, improves starting, and supports smooth running under load. Suitable for a wide range of Briggs & Stratton engines commonly found in walk‐behind lawnmowers, small garden tractors, and other compact garden and light construction equipment.
Key Features:
- Genuine Briggs & Stratton part for assured compatibility and reliability (OEM 499958)
- -020 oversize specification: +0.020 in (+0.51 mm) for re-bored cylinders
- Aluminium alloy construction for strength, low weight, and good heat transfer
- Helps restore compression for easier starting and stable power delivery
- Manufactured to original tolerances for smooth operation and reduced wear
- Suitable for a broad range of B&S vertical and horizontal shaft engines
- Durable build to withstand typical mower and garden tractor duty cycles
- Straightforward replacement using standard workshop tools and procedures
Typical Applications:
Used during engine rebuilds or scheduled overhauls on Briggs & Stratton powered equipment, including walk‐behind lawnmowers, small ride‐on mowers, garden tractors, generators, tillers, and other compact machinery. Ideal when a cylinder has been machined to +0.020 in (+0.51 mm) and an oversize piston is required to regain correct clearances and compression.
Also known as:
Piston kit, piston and ring kit, +0.020 in oversize piston (+0.51 mm), 20‐thou oversize piston, oversize engine piston for Briggs & Stratton, piston and gudgeon pin assembly, engine rebuild piston kit.
Alternate Part Numbers:
499958, BS499958
Product Specifications
| L&S Part No. | BS499958 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Briggs & Stratton |
| OEM No. | BS499958 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Key Features | - Genuine Briggs & Stratton part ensures compatibility (OEM 499958) - +0.020 inch oversize for re-bored cylinders - Aluminium alloy for strength and heat transfer - Restores compression for stable power delivery - Fits various B&S vertical and horizontal shaft engines |
