Description
Overview:
The Connecting Rod Big Ends U/S020 (pairs) are genuine BSA bearing shells for the BSA 320cc Industrial Engine. Supplied as a matched pair, these big-end shells sit in the connecting rod and cap to support the crankpin, maintaining the oil film that protects the crankshaft and piston assembly under load. Marked U/S 020, they suit crankpins ground 0.020 in undersize (approx. 0.51 mm). Manufactured from durable bearing-grade metal with a precision finish, they offer consistent clearance and long service life when installed correctly and lubricated to specification. Ideal for maintenance or restoration of BSA 320cc units, they are unused old stock and may show light tarnish from storage, which does not affect performance. OEM reference: 86 123 U/S 020.
Key Features:
- Genuine BSA part for assured fit and compatibility with the 320cc Industrial Engine
- U/S 020 size for 0.020 in (about 0.51 mm) undersize crankpins after regrind
- Supplied as a pair of shells for one connecting rod big end
- Precision-machined bearing surfaces for stable oil film and reduced wear
- Durable bearing-grade construction designed for industrial duty cycles
- Direct replacement with no modifications when used with the correct undersize journal
- Helps restore correct oil clearance, reducing knock, heat, and vibration
- Suitable for rebuilds, overhauls, and long-term maintenance of vintage engines
- Unused old stock; minor storage tarnish possible without affecting function
- OEM reference 86 123 U/S 020 helps verify selection during parts identification
Typical Applications:
Used during engine rebuilds or repairs when the crankshaft big-end journals have been reground to 0.020 in (approx. 0.51 mm) undersize. Common in restoration of BSA 320cc industrial engines powering static plant, pumps, generators, and light machinery, where reliable crankshaft support and correct oil clearance are essential for smooth running and longevity.
Also known as:
Big-end shells, con-rod shells, connecting rod shells, crankpin bearings, big end inserts, big end bearing shells, conrod big end bearings.
Fits Models:
BSA 320cc
Alternate Part Numbers:
86 123 U/S 020, 86123US020
Product Specifications
| L&S Part No. | 86 123 U/S 020 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | BSA |
| OEM No. | 86 123 U/S 020 |
| Unit of Sale | 1 |
| Applications | BSA 320cc |
| Machine Type | Engines |
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