The Honda 12000-Z5T-415 Cylinder Assembly (Self Starter+Alert) is a genuine OEM replacement built for GX340 and GX390 horizontal shaft engines. This assembly is the variant specified for units equipped with an electric self-starter and an alert system, so confirming your engine's configuration before ordering is essential. As a direct Honda OEM component, it is produced to the same drawings and tolerances as the original, ensuring proper alignment of all cylinder features, ports, and mounting surfaces. Honda supersedes and revises part fitment at serial number breaks, so verify your engine's serial number against the fitment table to confirm part number 12000-Z5T-415 is the correct selection for your unit.
Key Features
- Variant-Specific Configuration — designed exclusively for GX340 and GX390 engines equipped with an electric self-starter and alert system; confirm your engine's build before ordering
- Genuine Honda OEM Construction — manufactured to Honda's original engineering drawings, ensuring correct bore geometry, port sizing, and all mounting and sealing surfaces match the original assembly exactly
- Critical Fitment Check Recommended — Honda updates cylinder assemblies at production serial breaks; cross-reference your engine serial number against the fitment table to confirm this is the right assembly for your machine
- Core Engine Structural Integrity — a sound cylinder assembly maintains proper compression, correct oil control, and stable alignment of all internal components; a cracked, worn, or incorrect cylinder leads to power loss, oil consumption, and accelerated engine wear
The cylinder assembly is the structural core of a four-stroke engine. It houses the piston and rings, forms the combustion chamber with the cylinder head above it, and provides the mounting foundation for ancillary components including the crankcase below. On GX340 and GX390 horizontal shaft engines, the cylinder bore must maintain precise dimensions to sustain compression and control oil film across the piston rings — any loss of bore integrity directly degrades power output and increases fuel and oil consumption. This particular assembly is configured for engines fitted with an electric self-starter and an alert system, meaning it carries the specific bosses, passages, or provisions those systems require; fitting a non-matching cylinder variant to such an engine will result in components that cannot be correctly installed or connected.
Part Details
| Part Number | 12000-Z5T-415 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Assembly (Self Starter+Alert) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX340, GX390 | All |
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.
