The Husqvarna 505666601 Spark Plug X5000 is a genuine OEM replacement designed for the Soff-Cut4000 early entry saw. As a factory-sourced component, this spark plug meets Husqvarna's exact output and resistance specifications, ensuring the engine fires consistently and performs as intended. DHS Equipment supplies this part to help keep your Soff-Cut4000 running at full capacity on the job.
Key Features
- OEM Ignition Specification — manufactured to Husqvarna's precise electrode gap and heat range requirements for the Soff-Cut4000 engine, ensuring reliable ignition and clean combustion.
- Drop-In Thread and Terminal Match — this spark plug installs directly into the cylinder head with the correct thread pitch and terminal configuration, requiring no adaptation.
- Soff-Cut4000 Compatibility — engineered specifically for the Soff-Cut4000 early entry saw, so you can order with confidence knowing this is the correct part for your machine.
- Consistent Engine Starting — a properly functioning spark plug delivers a strong, consistent spark, supporting reliable cold and warm starts and smooth engine operation throughout the cutting session.
- Fuel System Safety Compliance — using the correct OEM-specified plug prevents misfires and incomplete combustion, both of which can lead to fuel accumulation and unsafe operating conditions.
A spark plug is the ignition source for the engine's combustion cycle — it delivers the electrical spark that ignites the air-fuel mixture inside the cylinder at precisely the right moment. When a spark plug wears out or fails, the engine may become difficult to start, run rough, lose power, or stall under load. Replacing it with the correct OEM specification plug restores proper ignition timing and combustion efficiency, keeping the Soff-Cut4000 cutting reliably from the first pull.
Part Details
| Part Number | 505666601 |
|---|---|
| Brand | Husqvarna |
| Part Type | Genuine OEM |
| Description | Spark Plug X5000 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Early Entry Saw | Soff-Cut4000 |
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.
