The Multiquip 13103ZJ1840 is a genuine OEM Piston OS 0.50 designed for GA9.7HE gasoline-powered generators and AR13HC, AR13H, and AR13HA/HAR asphalt ride-on rollers. As a direct factory replacement, this oversize piston is engineered to restore proper engine compression and performance to machines running engines that have been bored out to the 0.50mm oversize specification. Sourced directly through Multiquip's authorized parts network, 13103ZJ1840 ensures an exact match to the original component replaced during engine rebuild. DHS Equipment stocks genuine Multiquip OEM parts so you can get your machine back in service with full confidence in part accuracy.
Key Features
- Genuine OEM Piston Construction — Cast and finished to the same dimensional tolerances as the original engine piston, ensuring correct ring groove depth, skirt clearance, and wrist pin alignment for a proper engine rebuild.
- 0.50mm Oversize Specification — Designed specifically for engines that have been bored to the 0.50mm oversize standard; using the correct oversize piston is critical to achieving proper compression and oil control after a cylinder bore.
- Confirmed Fitment Across Multiple Equipment Families — Compatible with GA9.7HE generators and AR13HC, AR13H, and AR13HA/HAR ride-on asphalt rollers, covering a range of Multiquip equipment that shares this engine platform.
- Restores Full Engine Compression — A worn or improperly sized piston causes low compression, excessive oil consumption, and loss of power; installing the correct OEM oversize piston brings engine output back to its designed operating level.
- Engine Integrity and Longevity — Using a genuine Multiquip piston during an engine rebuild protects the integrity of the bore, reduces the risk of premature ring wear, and supports the long-term reliability of the engine assembly.
The piston is a core reciprocating component inside the engine cylinder, converting combustion pressure into mechanical force that drives the crankshaft. When an engine cylinder is worn beyond its standard service limits, the bore is machined oversize and a correspondingly larger piston — in this case the OS 0.50 specification — is installed to restore the correct fit between piston, rings, and cylinder wall. Without the right oversize piston, an engine will exhibit low compression, increased blowby, and excessive oil consumption, all of which reduce power output and accelerate internal wear.
Part Details
| Part Number | 13103ZJ1840 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Piston OS 0.50 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Gasoline Powered Generators | GA9.7HE |
| Rollers | AR13HC |
| Rollers | AR13H |
| Rollers | AR13HA/HAR |
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.
