Husqvarna 545081864 Piston & Connecting Rod Kit – Genuine OEM Replacement Engine Kit

Part Number: 545081864
Category: Small Engine Piston, Connecting Rod & Internal Engine Components
Type: Piston & Connecting Rod Kit – Genuine OEM Replacement Engine Kit

The Husqvarna 545081864 Piston & Connecting Rod Kit is a genuine OEM replacement internal engine kit designed for select Husqvarna, Poulan, Poulan Pro, and compatible gas-powered outdoor power equipment. The kit provides the factory-specified piston and connecting-rod components used to restore the reciprocating assembly of compatible engines.

Product Specifications

• Part Number: 545081864
• Manufacturer: Husqvarna
• Product Type: Piston & Connecting Rod Kit
• OEM Description: Piston / Connecting Rod Kit
• Component Type: Internal Engine Repair Kit
• Function: Transfers Combustion Force from the Piston to the Crankshaft
• System: Piston / Connecting Rod / Crankshaft Assembly
• Application: Gas-Powered Outdoor Power Equipment
• Compatible Brand: Husqvarna
• Additional Applications: Select Poulan / Poulan Pro Equipment
• Engine Type: Small Gasoline Engine
• Component Location: Internal Engine / Crankcase & Cylinder Assembly
• Replacement Type: Direct OEM Replacement
• OEM Status: Genuine Husqvarna OEM Part
• Condition: New
• Quantity: 1 Piston & Connecting Rod Kit
• Part Number Reference: 545081864
• Alternate Number Format: 545 08 18-64

Features & Benefits

• Genuine Husqvarna OEM replacement engine kit
• Factory-specified piston and connecting rod components
• Designed for select compatible small-engine applications
• Replaces damaged or excessively worn internal engine components
• Helps restore the engine's reciprocating assembly
• Piston receives combustion force within the cylinder
• Connecting rod transfers piston movement to the crankshaft
• Supports proper engine compression when used with serviceable mating components
• Designed to operate with the applicable factory crankshaft and cylinder
• Manufactured to original equipment requirements
• Provides application-specific dimensions and fit
• Suitable for internal engine repair and rebuilding
• Useful following piston or connecting-rod damage
• Helps restore an engine affected by mechanical wear or failure
• Direct replacement for applications requiring 545081864
• Genuine OEM engine components rather than an unspecified universal rebuild kit

Applications

The Husqvarna 545081864 Piston & Connecting Rod Kit is intended for select Husqvarna-family equipment and engine configurations specifically designed to use this OEM engine kit.

Applications may include select:

• Husqvarna outdoor power equipment
• Poulan outdoor power equipment
• Poulan Pro equipment
• Gas-powered lawn and garden equipment
• Small-engine piston assemblies
• Connecting-rod assemblies
• Crankshaft and piston repairs
• Internal engine rebuilding
• Engine overhaul applications
• Equipment restoration
• OEM replacement applications requiring 545081864

Because engines that appear externally similar may use different pistons, rods, crankshafts, cylinders, wrist pins, and bearings, compatibility should always be verified using the complete equipment model and product number.

Piston & Connecting Rod Function

The piston and connecting rod work together as part of the engine's reciprocating assembly.

During the combustion cycle:

1. The fuel-air mixture burns inside the cylinder.
2. Expanding combustion gases force the piston downward.
3. The connecting rod transfers this force from the piston to the crankshaft.
4. The crankshaft converts the piston's reciprocating motion into rotational movement.
5. The piston then travels through the remaining engine cycle as the crankshaft continues rotating.

Proper fit and condition of the piston, connecting rod, crankshaft, cylinder, bearings, and related components are essential for reliable engine operation.

Common Reasons for Replacement

Replacement of the 545081864 Piston & Connecting Rod Kit may be appropriate following:

• Piston scoring
• Piston seizure
• Connecting rod damage
• Excessive internal engine wear
• Loss of compression associated with piston damage
• Overheating
• Insufficient lubrication
• Mechanical engine failure
• Excessive connecting-rod play
• Damaged piston-pin area
• Cylinder damage affecting the piston
• Crankshaft-related failure
• Internal damage discovered during engine disassembly

A damaged piston or connecting rod can often be a symptom of another engine problem, so the complete engine should be inspected before reassembly.

Engine Inspection During Replacement

When installing a replacement piston and connecting rod kit, inspect related components including:

• Cylinder bore
• Cylinder wall
• Crankshaft
• Crankshaft journals
• Bearings
• Piston pin / wrist pin
• Piston rings
• Crankcase
• Engine seals
• Engine gaskets
• Lubrication surfaces
• Intake system
• Cooling components

If the original piston was severely scored or seized, installing a replacement piston without addressing cylinder damage or the underlying cause of failure may result in rapid damage to the new components.

Important Notes

• Verify compatibility with your specific Husqvarna, Poulan, or Poulan Pro equipment model, product number, serial number, engine configuration, and production revision before ordering.
• Match part number 545081864 directly with the number shown in your equipment's illustrated parts diagram or OEM documentation.
• The alternate formatted part number may appear as 545 08 18-64.
• This is an internal engine repair component and should only be installed on compatible engine configurations.
• Do not select a piston or connecting rod based solely on approximate engine displacement or physical appearance.
• Pistons can differ in diameter, compression height, pin diameter, ring-groove dimensions, skirt profile, crown design, and material.
• Connecting rods can differ in length, journal dimensions, piston-pin dimensions, bearing configuration, offset, and lubrication requirements.
• Confirm the exact contents of the 545081864 kit if a specific piston pin, ring, bearing, clip, fastener, or gasket is required for your repair.
• Do not assume that the cylinder, crankshaft, bearings, piston rings, wrist pin, circlips, seals, gaskets, or other engine components are included unless explicitly specified.
• Inspect the cylinder carefully before installing a replacement piston.
• Do not install a new piston into a severely scored, cracked, warped, or excessively worn cylinder.
• Inspect the crankshaft and applicable rod journal for scoring, discoloration, excessive wear, or heat damage.
• Check applicable bearings for roughness, excessive clearance, discoloration, or physical damage.
• Determine why the original piston or connecting rod failed before installing replacement components.
• Potential causes of piston damage can include overheating, insufficient lubrication, incorrect fuel or oil mixture, lean running conditions, intake leaks, cooling problems, or foreign-object damage.
• Correct the underlying engine problem before returning the equipment to service.
• Keep all internal engine components and work surfaces clean during disassembly and reassembly.
• Prevent dirt, abrasive debris, old gasket material, or metal particles from entering the crankcase or cylinder.
• Lubricate internal components during assembly according to the applicable manufacturer service procedure.
• Install piston rings, piston pin components, bearings, and retainers in their specified locations and orientations where applicable.
• Verify piston orientation before final assembly.
• Follow the manufacturer's specified fastener torque values and tightening sequences.
• Rotate the engine by hand after assembly, where appropriate, to verify that internal components move smoothly without binding.
• After completing the repair, verify proper compression and engine operation before returning the equipment to normal service.
• Internal engine rebuilding requires precise measurements and assembly procedures. Professional service may be appropriate if the required clearances and specifications cannot be verified.
• Shut off the equipment, allow the engine to cool completely, disconnect the spark plug, drain fuel where required, and follow applicable service procedures before beginning internal engine repairs.
• This listing is for one Husqvarna 545081864 Piston & Connecting Rod Kit only unless otherwise specified. Cylinder assemblies, crankshafts, bearings, gaskets, seals, carburetors, and other engine components are sold separately unless explicitly included.
• Match part number 545081864 with your equipment's illustrated parts diagram or OEM documentation before ordering to ensure proper fitment.