Homelite 99981080006 Valve Spring – Genuine OEM Replacement Engine Valve Spring
Part Number: 99981080006
Category: Pressure Washer Engine Valve, Cylinder Head & Internal Engine Parts
Type: Valve Spring – Genuine OEM Replacement Engine Valve Spring
The Homelite 99981080006 Valve Spring is a genuine OEM replacement internal engine component designed for select Homelite, Ryobi, PowerStroke, and compatible pressure washer engines. Installed within the cylinder head and valve-train assembly, the spring provides the force required to return the applicable intake or exhaust valve to its closed position during engine operation.
Product Specifications
- Part Number: 99981080006
- Manufacturer: Homelite
- Product Type: Valve Spring
- OEM Description: Valve Spring
- OEM Reference: 100004565
- Alternate Description: Spring Valve-100004565
- Component Type: Internal Engine / Valve Train Component
- Function: Returns & Holds the Applicable Engine Valve in the Closed Position
- System: Cylinder Head / Valve Train
- Application: Pressure Washer / Small Engine Equipment
- Compatible Brands: Homelite / Ryobi / PowerStroke / Ridgid Applications
- Component Location: Engine Cylinder Head
- Associated Components: Valve Spring Seat / Rocker Arm / Intake Valve / Exhaust Valve
- Factory Quantity: 2 Per Applicable Engine
- Replacement Type: Direct OEM Replacement
- OEM Status: Genuine OEM Part
- Condition: New
- Quantity Sold: 1 Valve Spring unless otherwise specified
- Part Number Reference: 99981080006
Factory parts documentation for applicable PowerStroke engines identifies 99981080006 as item 6, Valve Spring (100004565), with a quantity of two per engine.
Features & Benefits
- Genuine Homelite OEM replacement engine component
- Factory-designated Valve Spring 100004565
- Designed for compatible small-engine cylinder heads
- Works with applicable intake and exhaust valves
- Provides spring force to return the valve after actuation
- Helps maintain proper valve seating during engine operation
- Works in conjunction with the rocker arm and valve spring seat
- Supports proper engine compression and combustion
- Manufactured to match the original equipment configuration
- Helps restore proper valve-train operation
- Suitable for pressure washer engine repair and rebuilding
- Ideal replacement for weakened, broken, distorted, corroded, damaged, or missing valve springs
- Direct replacement for equipment requiring 99981080006
- Genuine OEM component rather than a universal valve spring
Applications
The Homelite 99981080006 Valve Spring is documented in several pressure washer engine applications, including the PowerStroke PS80555E and Ryobi RY803111 (Manufacturing No. 090079288). Factory documentation for both models lists two 99981080006 valve springs within the engine cylinder-head assembly.
Applications include:
- PowerStroke PS80555E Pressure Washer
- Ryobi RY803111 Pressure Washer
- Ryobi RY803111 – Mfg. No. 090079288
- Select Homelite pressure washer engines
- Select Ryobi pressure washer engines
- Select PowerStroke pressure washers
- Compatible small-engine cylinder-head assemblies
- Intake valve assemblies
- Exhaust valve assemblies
- Engine valve-train repair and rebuilding
- OEM replacement applications requiring 99981080006 / 100004565
PartsTree also confirms 99981080006 as the Valve Spring within the Ryobi RY803111 engine assembly.
Important Notes
- Verify compatibility with your specific equipment model, manufacturing number, engine model, serial number, and production revision before ordering.
- Homelite OEM suppliers identify 99981080006 as “Spring Valve-100004565.”
- Factory PowerStroke documentation identifies 99981080006 as “Valve Spring (100004565).”
- Applicable engine diagrams specify two valve springs per engine, but this does not necessarily mean two springs are supplied when purchasing one part number. Confirm listing quantity before ordering.
- The corresponding 99981080005 Valve Spring Seat is listed separately in applicable engine diagrams.
- The 99981080008 Intake Valve and 99981080009 Exhaust Valve are also separate components.
- Do not confuse this component with the governor spring, recoil starter spring, or other engine springs.
- Do not select a replacement valve spring based solely on appearance. Spring diameter, free length, wire diameter, spring rate, installed height, and engine application can vary.
- Inspect the valve spring seat, rocker arm, valve stem, valve guide, intake valve, exhaust valve, and cylinder head when replacing the spring.
- A weak or broken valve spring can contribute to improper valve operation, reduced compression, poor engine performance, unusual valve-train noise, or starting problems.
- If the original spring is broken, inspect the associated valve and surrounding cylinder-head components for additional damage before reassembly.
- Maintain the correct intake and exhaust valve clearances specified for the applicable engine during reassembly.
- Internal engine repairs require correct component positioning and valve timing. Follow the applicable manufacturer service procedure.
- This listing is for one Homelite 99981080006 Valve Spring (100004565) unless otherwise specified. Valve spring seats, rocker arms, intake valves, exhaust valves, seals, cylinder heads, gaskets, and other engine components are sold separately.
- Match part number 99981080006 / reference 100004565 with your equipment's illustrated parts diagram or OEM documentation before ordering to ensure proper fitment.
