The Wacker Neuson Piston Ring Set (0.50) is a genuine OEM oversize piston ring set designed for BFS floor saws, GV portable generators, and BPU reversible vibratory plate compactors. As a direct Wacker Neuson OEM part, the is manufactured to the same specification as the original rings installed at the factory, ensuring a correct fit against the cylinder wall without guesswork. This 0.50 mm oversize set is the appropriate replacement when an engine has been bored out to the first oversize dimension during a cylinder rebuild. Confirmed fitment includes the BFS 914A, BFS 914AB, BFS 935AB, BFS 940, BFS 940A, GV5000A, GV5003A, BPU 3050A, BPU 3750Ats, and BPU 4045A series.
Key Features
- Oversize-Matched Ring Geometry — Ground to 0.50 mm oversize tolerance so the rings seat correctly against a bored cylinder bore, maintaining proper compression and oil control from first start-up.
- Genuine Wacker Neuson OEM Quality — Sourced directly from Wacker Neuson, this ring set meets the exact material grade and ring-gap specification required for these Honda-based and Wacker-powered engines.
- Multi-Family Fitment — A single part number covers the BFS floor saw series, GV portable generator series, and BPU reversible plate compactor series, making it a versatile stock item for mixed fleets.
- Compression and Oil Seal Integrity — Correctly sized rings restore full cylinder compression and prevent oil blow-by, keeping the engine running at rated power output and within emissions tolerances.
- Rebuild-Ready Set — Supplied as a complete set so all ring positions — compression and oil control — are replaced together, supporting a thorough and balanced engine overhaul.
Piston rings form a dynamic seal between the piston and the cylinder wall, serving two critical functions: holding combustion pressure above the piston to generate power, and scraping excess oil back down the cylinder to prevent it from burning off in the combustion chamber. Over time, rings wear and lose their tension against the bore, causing compression loss, increased oil consumption, hard starting, and reduced power output. When an engine is bored out to correct for cylinder wear, standard-size rings will no longer seal properly — an oversize set such as the 5100001285 (0.50 mm) is required to match the new bore diameter and restore correct sealing performance across the engine's full operating range.
Part Details
| Part Number | 5100001285 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston Ring Set (0.50) |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| BFS940 | BFS940 | 5100029229, 5100054574 |
| GV5000A | GV5000A | 5000009346, 5000009351, 5000009361, 5100006204 |
| 50Hz Portable Value Generator | GV5003A | 5000009347, 5000009362, 5100002154 |
| BPU 3050A | BPU 3050A | 5000008763 |
| BPU 3050A US | BPU 3050A US | 5000610361 |
| BFS 935A SAW,BASIC | BFS 935AB | 5000008910 |
| BPU 3750Ats | BPU 3750Ats | 5000610408 |
| BPU3750Ats | BPU 3750Ats US | 5000610423 |
| Gasoline Reversible Vibratory Plate | BPU 3050 | 5000008955 |
| BFS 914AB SAW | BFS 914AB | 5000610092 |
| BPU 4045A US | BPU 4045A US | 5100009663, 5000610403 |
| Petrol Floor Saw BFS 940A | BFS 940A | 5000610327, 5100004004 |
| Vibratory plate BPU 4045A | BPU 4045A | 5000610345 |
| Floor Saw | BFS 914A | 5100004002 |
| Floor saw BFS940 | BFS 940 | 5100009934 |
| Vibration Plate | BPU3050A CN | 5100039661 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
