The Wacker Neuson Piston (0,25) is a genuine OEM oversized service piston designed for BFS series floor saws, BPU series reversible vibratory plate compactors, and GV series portable generators. As a direct Wacker Neuson OEM component, part is manufactured to the exact tolerances required for correct fit and function within the engine cylinder bore. This 0.25 mm oversized specification makes it the appropriate replacement when cylinder reconditioning has been carried out and the bore has been honed to accept an oversized piston. Compatible models include the BFS 914A, BFS 914AB, BFS 935AB, BFS 940, BFS 940A, BPU 3050, BPU 3050A, BPU 4045A, GV5000A, and GV5003A, among others.
Key Features
- OEM Oversized Specification: — Manufactured to a precise 0.25 mm oversize, ensuring correct wall clearance and ring seal after cylinder boring or honing.
- Cross-Family Engine Fitment: — Fits the shared engine platform across BFS floor saws, BPU reversible vibratory plate compactors, and GV portable generators — one part number covers multiple machine families.
- Drop-In Engine Rebuild Component: — Designed to pair with corresponding oversized piston rings and a freshly honed cylinder bore for a complete, properly sealed rebuild.
- Combustion Integrity Restored: — A correctly sized piston maintains compression, prevents blow-by, and restores full power output — worn or undersized pistons cause hard starts, loss of power, and excessive oil consumption.
- Genuine Wacker Neuson OEM Quality: — Sourced directly from Wacker Neuson, this piston meets the same material and dimensional standards as the original factory-installed component.
The piston is the reciprocating component inside the engine cylinder that converts the force of combustion into the rotational motion that drives the machine. It must maintain a precise fit within the bore to seal compression gases above and control oil below — too loose, and compression leaks past the rings, robbing the engine of power and causing excessive oil burning. An oversized piston, such as this 0.25 mm variant, is used specifically during engine reconditioning: after the cylinder bore is bored out or honed to remove wear, scoring, or taper, an oversized piston restores the correct running clearance that the standard-size piston can no longer provide. Using the correct oversize designation is critical — installing the wrong size will result in either seizure or continued blow-by.
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.
