The Wacker Neuson Piston (0,25) is a genuine OEM oversized piston designed for BFS floor saws, BPU reversible vibratory plate compactors, and GV portable generators sharing the same engine platform. As a direct Wacker Neuson OEM component, the is manufactured to the exact dimensional tolerances required for this 0.25 mm oversized bore — making it the correct choice for engine rebuilds where the cylinder has been bored out to accept an oversize piston. Confirmed fitment spans the BFS 914A/914AB, BFS 935AB, BFS 940/940A, BPU 3050A, BPU 3750Ats, BPU 4045A, and GV5000A/GV5003A model families.
Key Features
- Oversized Bore Specification: — Sized at 0.25 mm over standard, this piston is engineered specifically for engines rebuilt with a bored-out cylinder — using a standard-size piston in a bored cylinder will result in excessive clearance and rapid engine failure.
- Genuine OEM Construction: — Cast and finished to Wacker Neuson's exact metallurgical and dimensional spec, ensuring correct ring groove depth, pin bore alignment, and skirt profile for proper compression sealing.
- Cross-Family Engine Platform Fit: — A single part number covers the shared engine used across BFS floor saws, BPU reversible plate compactors, and GV portable generators, confirming compatibility across all listed model families.
- Compression Integrity Restored: — A correctly fitted oversize piston seals the combustion chamber properly, restoring full compression and engine power output — critical for saws cutting through concrete and compactors working dense aggregate.
- Engine Rebuild Accuracy: — Pairing this piston with the correct oversize rings and a freshly bored cylinder ensures the rebuild meets original running clearances, preventing blow-by, oil consumption, and premature re-failure.
A piston is the reciprocating component inside the engine cylinder that transfers combustion pressure into crankshaft rotation. It must form a near-perfect seal against the cylinder wall — via its piston rings — to maintain compression and prevent hot combustion gases from escaping into the crankcase. When an engine cylinder becomes worn, scored, or out-of-round, it is rebored to a slightly larger diameter to restore a true surface, and an oversized piston like the 5100000367 is installed to match that enlarged bore. Without the correct oversize piston, the engine will suffer low compression, hard starting, power loss, excessive oil consumption, and accelerated internal wear.
Part Details
| Part Number | 5100000367 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston (0,25) |
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.
