Husqvarna 351 - User Manual

Questions and Answers

K
Katherine RoseAug 21, 2025
How to fix Husqvarna Chainsaw that has difficulty starting?
- A
  Andres RichardsonAug 22, 2025
  If you're experiencing difficulty starting your Husqvarna Chainsaw, several factors could be the cause. Try the following:* Adjust the L screw.* Check if the air filter is blocked.* Ensure the choke is working correctly. Look for a worn choke pivot or valve.* Inspect the fuel system for a blocked fuel filter or fuel line.* Examine the piston ring for seizing and the impulse channel for blockages.
J
Jeremy MorrisonSep 4, 2025
Why is my Husqvarna 351 idling too rich?
- C
  cmoralesSep 4, 2025
  If your Husqvarna Chainsaw is idling too rich, try the following:* Adjust the L screw.* Check for a worn needle valve or needle valve lever.* Ensure the needle valve is not set too high and that the needle valve assembly is not sticking.* Inspect for a leaking control diaphragm or cover plate.
C
Crystal SimmonsSep 2, 2025
Why is my Husqvarna 351 Chainsaw idling uneven?
- T
  Tyler HendrixSep 3, 2025
  Uneven idling in your Husqvarna Chainsaw can stem from several issues. Here's what to check:* Fuel supply: Look for a blocked fuel filter or fuel line.* Air leaks: Inspect the air intake hose for leaks and ensure carburettor mounting bolts are tight.* Throttle components: Check for a worn throttle valve pivot, loose throttle valve screw, or a worn throttle valve.* Carburettor issues: See if the needle valve assembly is sticking, there's a leak in the metering system, the metering system center knob is worn, or there's a hole in the diaphragm or leaking control diaphragm/cover plate.* Other: Check for crankcase leaks.
J
James CaseSep 1, 2025
What to do if my Husqvarna 351 will not idle?
- W
  William LynchSep 1, 2025
  If your Husqvarna Chainsaw will not idle, consider the following:* Adjust the L screw.* Check for a leaking air intake hose.* Ensure the carburettor mounting bolts are not loose.* Inspect the fuel hose for leaks or faults.* Check for blocked fuel filter, fuel line, or fuel tank vent.* Look for a stiff throttle valve pivot or a sticking throttle pushrod.* Examine the throttle return spring for defects and the throttle stop for bending.* Check for a faulty diffuser jet.
J
John CarterAug 31, 2025
Why is my Husqvarna 351 flooding when engine not running?
- S
  Scott CooperAug 31, 2025
  If your Husqvarna Chainsaw is flooding when the engine is not running, it could be due to a worn needle valve, a needle valve set too high, or a needle valve assembly sticking.
F
frederickchristianAug 29, 2025
Why is the carburettor leaking fuel on my Husqvarna 351 Chainsaw?
- S
  Stephanie MontgomeryAug 29, 2025
  If your Husqvarna Chainsaw's carburettor is leaking fuel, it could be due to a loose or faulty fuel pipe, a hole in the diaphragm, a worn needle valve, a needle valve assembly sticking, a needle valve set too high, a leak in the metering system, or a loose cover on the carburettor pump side.
M
Matthew NelsonAug 27, 2025
Why does my Husqvarna 351 Chainsaw engine stall when throttle is released?
- N
  Nicole LesterAug 27, 2025
  If your Husqvarna Chainsaw engine stalls when the throttle is released, it might be due to:* Adjusting the L and H screws.* A faulty pump diaphragm.* A needle valve set too high or a needle valve assembly that is sticking.* Faulty diffuser jets.
A
Aaron MillerAug 27, 2025
What to do if my Husqvarna 351 does not accelerate?
- J
  Jay MorrisAug 27, 2025
  If your Husqvarna Chainsaw does not accelerate, consider the following potential issues:* Adjust the L and H screws.* Check for a blocked air filter, fuel tank vent, or fuel filter.* Ensure the fuel line isn't blocked and the fuel hose isn't loose or damaged.* Inspect for a blocked impulse channel.* Examine the carburettor pump side for a loose cover or faulty pump diaphragm.* Look for a leaking air intake hose or loose carburettor mounting bolts.* Verify that the needle valve isn't set too low and the metering system is correctly assembled.* Check for a sticking needle valve assembly, faulty diffuser jets, or a blocked silencer.
D
Donald MartinAug 25, 2025
Why won't my Husqvarna Chainsaw run at full throttle?
- N
  Nicole SandersAug 25, 2025
  If your Husqvarna Chainsaw won't run at full throttle, it could be due to several reasons:* Adjust the H screw.* A blocked air filter, fuel tank vent, or fuel filter.* A blocked or leaking fuel line or impulse channel.* A loose or damaged fuel hose.* A loose cover on the carburettor pump side, or a faulty pump diaphragm.* A leaking air intake hose or loose carburettor mounting bolts.* A needle valve set too low, a damaged or incorrectly assembled metering system, or a sticking needle valve assembly.* A leaking control diaphragm/cover plate or a blocked silencer.
T
Todd PriceAug 23, 2025
Why is my Husqvarna 351 Chainsaw carburettor leaking fuel?
- C
  christiangriffinAug 23, 2025
  If the carburettor of your Husqvarna Chainsaw is leaking fuel, it could be due to several reasons:* Check for a loose or faulty fuel pipe.* Inspect the diaphragm for any holes.* Examine the needle valve for wear or sticking.* Ensure the needle valve assembly is not sticking and is set at the correct height.* Look for any leaks in the metering system (air or fuel) or a loose cover on the carburettor pump side.

Husqvarna 351 Specifications

General

Power output	2.4 kW
Fuel tank volume	0.5 l
Weight	5.2 kg
Oil tank volume	0.26 liters
Chain pitch	0.325 inches
Bar length	40 cm (16 in)

Summary

Introduction

Arrangement of the manual

Explains manual usage methods.

Troubleshooting

Describes common faults and likely causes.

Repair instructions

Detailed step-by-step repair instructions.

Safety Regulations

General Instructions

General safety precautions and manual usage guidelines.

Special Instructions

Specific hazards related to fuel and safety during operation.

Special Tools

Tool Identification

Visual identification of specialized servicing tools.

Technical Data

Engine Specifications

Engine displacement, cylinder bore, stroke, and max power.

Cutting Specifications

Effective cutting length, chain speed, pitch, and drive link.

Technical Data

Speed and Capacity Data

Engine speeds, fuel/oil capacities, and oil pump type.

Weight and Features

Weight specs and heated hand grips info.

Construction and Function

Carburettor Sub-systems

Explains the three sub-systems of the carburettor.

Carburettor Modes

Describes carburettor operation in cold start and idling modes.

Construction and Function

Throttle Valve Operation

Explains carburettor operation at part and full throttle.

Troubleshooting

Starting Problems

Lists common starting issues and their potential causes.

Idling Issues

Details problems related to low RPM and uneven idling.

Troubleshooting

Performance Issues

Covers problems with high RPM, acceleration, and stalling.

Troubleshooting Methods Reference

Points to other sections for component-specific troubleshooting.

Repair Instructions: Chain Brake

Chain Brake Dismantling

Step-by-step guide to remove the chain brake.

Chain Brake Cleaning & Inspection

Procedures for cleaning and inspecting chain brake parts.

Repair Instructions: Chain Brake

Chain Brake Reassembly

Instructions for reassembling the chain brake.

Chain Brake Operating Test

How to test the chain brake after repair.

Repair Instructions: Silencer

Silencer Removal & Refitting

Steps to remove and refit the silencer.

Chain Catcher Replacement

Guide on replacing the chain catcher.

Repair Instructions: Stop Switch

Stop Switch Removal & Measurement

Procedure for removing and testing the stop switch.

Stop Switch Cleaning & Inspection

Cleaning and inspection of stop switch components.

Repair Instructions: Stop Switch & Choke Control

Stop Switch Refitting

Steps to refit the stop switch.

Choke Control Removal

Procedure for removing the choke control.

Repair Instructions: Choke & Throttle Controls

Choke Control Refitting

Steps for refitting the choke control.

Throttle Lock & Trigger Operations

Removal and refitting of throttle lock, trigger, and spring.

Repair Instructions: Hand Grip Heater & Generator

Hand Grip Heater Removal & Troubleshooting

Steps to remove and troubleshoot the hand grip heater.

Generator Troubleshooting

Troubleshooting the generator component.

Repair Instructions: Heater & Generator Data

Heater & Generator Resistance Checks

Measuring resistance for various heaters and generator.

Carburettor Heater Troubleshooting

Troubleshooting specific carburettor heater issues.

Repair Instructions: Heater Element

Heater Element & Rear Hand Grip Removal

Steps to remove heater element and rear hand grip.

Hand Grip Heater Refitting

Steps to refit the hand grip heater.

Repair Instructions: Starter Assembly

Starter Assembly Removal

Procedure for removing the starter assembly.

Starter Cord Replacement

How to replace a broken or worn starter cord.

Repair Instructions: Recoil Spring & Starter Assembly

Recoil Spring Replacement & Tensioning

Replacing and tensioning the recoil spring.

Starter Assembly Refitting

Steps to refit the starter assembly.

Repair Instructions: Ignition Module

Ignition Module Testing

Procedure for testing the ignition module.

Ignition Module & Flywheel Removal

Steps to remove the ignition module and flywheel.

Repair Instructions: Generator

Generator Replacement

Steps to replace the generator.

Generator Refitting

Steps to refit the generator.

Repair Instructions: Ignition Module & Flywheel Refitting

Ignition Module & Flywheel Refitting

Steps to refit the ignition module and flywheel.

Repair Instructions: Centrifugal Clutch

Centrifugal Clutch Removal & Inspection

Procedure for removing and inspecting the centrifugal clutch.

Centrifugal Clutch Refitting

Steps to refit the centrifugal clutch.

Repair Instructions: Oil Pump

Oil Pump Removal

Steps to remove the oil pump for various models.

Repair Instructions: Oil Pump

Oil Pump Refitting

Steps to refit the oil pump for various models.

Repair Instructions: Oil Pump Refitting

Oil Pump Refitting 340, 345

Steps to refit the oil pump for 340, 345 models.

Repair Instructions: Carburettor & Oil Pump

Adjustable Oil Pump Adjustment

Adjusting the oil pump for specific models.

Carburettor Removal

Steps to remove the carburettor.

Repair Instructions: Carburettor

Carburettor Heater Information

Details related to carburettor heaters.

Carburettor Dismantling

Steps to dismantle the carburettor.

Repair Instructions: Carburettor

Carburettor Cleaning & Inspection

Cleaning and inspection of carburettor components.

Carburettor Reassembly

Steps to reassemble the carburettor.

Repair Instructions: Carburettor

Carburettor Pressure Testing

How to pressure test the carburettor.

Carburettor Refitting

Steps to refit the carburettor.

Repair Instructions: Carburettor Heater

Carburettor Refitting

Continues carburettor refitting steps.

Carburettor Heater Refitting

Steps to refit the carburettor heater.

Repair Instructions: Air Intake System

Air Intake System Removal

Steps to remove the air intake system.

Air Intake System Cleaning & Inspection

Cleaning and inspection of air intake system parts.

Repair Instructions: Air Intake System

Air Intake System Refitting

Steps to refit the air intake system.

Repair Instructions: Carburettor Adjustment

Carburettor Adjustment Procedure

How to adjust the carburettor.

Engine Speed & Basic Requirements

Recommended engine speeds and prerequisites.

Low Speed Jet Adjustment

Procedure for adjusting the low speed jet.

Repair Instructions: Carburettor & Fuel Tank

Idling & High Speed Jet Adjustment

Adjusting idling speed and high speed jet.

Fuel Tank Removal

Steps to remove the fuel tank.

Repair Instructions: Fuel Tank

Fuel Tank Cleaning & Inspection

Cleaning and inspection related to the fuel tank.

Fuel Filter & Hose Replacement

How to replace the fuel filter and hose.

Repair Instructions: Fuel Tank & Vent

Tank Vent Testing

How to test the tank vent.

Fuel Tank Refitting

Steps to refit the fuel tank.

Repair Instructions: Piston & Cylinder

Piston & Cylinder Removal

Steps to remove the piston and cylinder.

Piston & Cylinder Cleaning & Inspection

Cleaning and inspection of piston and cylinder parts.

Repair Instructions: Decompression Valve

Decompression Valve Pressure Testing

How to pressure test the decompression valve.

Repair Instructions: Piston & Cylinder

Piston & Cylinder Refitting

Refitting piston and cylinder for specific models.

Repair Instructions: Cylinder Testing

Piston & Cylinder Refitting

Refitting piston and cylinder for 340, 345 models.

Cylinder Pressure Testing

How to pressure test the cylinder.

Repair Instructions: Crankcase & Crankshaft

Crankcase & Crankshaft Dismantling

Dismantling the crankcase and crankshaft.

Repair Instructions: Crankshaft & Bearings

Crankshaft Complete Dismantling

Dismantling the complete crankshaft.

Crankshaft Bearings & Sealing Rings

Replacing crankshaft bearings and sealing rings.

Repair Instructions: Crankcase & Crankshaft

Crankcase & Crankshaft Reassembly

Reassembly of crankcase and crankshaft.

Crankshaft Bearings Replacement

Replacing crankshaft bearings for specific models.

Repair Instructions: Crankshaft Reassembly

Crankshaft Complete Reassembly

Reassembling the complete crankshaft.

Repair Instructions: Thread Repair & Bolts

Repairing Damaged Threads

How to repair damaged threads.

Guide Bar Bolts Replacement

Steps to replace guide bar bolts.

Appendix A: Carburettor Adjustment

Basic Adjustment for EPA II Carburetors

Steps for basic adjustment of EPA II carburetors.

H-Needle & Carburettor Replacement

Replacing H-needle or the entire carburetor.

L-Needle Replacement

Replacing the L-needle.

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Husqvarna 351 - User Manual

Table of Contents

Questions and Answers

Husqvarna 351 Specifications

Summary

Introduction

Arrangement of the manual

Troubleshooting

Repair instructions

Safety Regulations

General Instructions

Special Instructions

Special Tools

Tool Identification

Technical Data

Engine Specifications

Cutting Specifications

Technical Data

Speed and Capacity Data

Weight and Features

Construction and Function

Carburettor Sub-systems

Carburettor Modes

Construction and Function

Throttle Valve Operation

Troubleshooting

Starting Problems

Idling Issues

Troubleshooting

Performance Issues

Troubleshooting Methods Reference

Repair Instructions: Chain Brake

Chain Brake Dismantling

Chain Brake Cleaning & Inspection

Repair Instructions: Chain Brake

Chain Brake Reassembly

Chain Brake Operating Test

Repair Instructions: Silencer

Silencer Removal & Refitting

Chain Catcher Replacement

Repair Instructions: Stop Switch

Stop Switch Removal & Measurement

Stop Switch Cleaning & Inspection

Repair Instructions: Stop Switch & Choke Control

Stop Switch Refitting

Choke Control Removal

Repair Instructions: Choke & Throttle Controls

Choke Control Refitting

Throttle Lock & Trigger Operations

Repair Instructions: Hand Grip Heater & Generator

Hand Grip Heater Removal & Troubleshooting

Generator Troubleshooting

Repair Instructions: Heater & Generator Data

Heater & Generator Resistance Checks

Carburettor Heater Troubleshooting

Repair Instructions: Heater Element

Heater Element & Rear Hand Grip Removal

Hand Grip Heater Refitting

Repair Instructions: Starter Assembly

Starter Assembly Removal

Starter Cord Replacement

Repair Instructions: Recoil Spring & Starter Assembly

Recoil Spring Replacement & Tensioning

Starter Assembly Refitting

Repair Instructions: Ignition Module

Ignition Module Testing

Ignition Module & Flywheel Removal

Repair Instructions: Generator

Generator Replacement

Generator Refitting

Repair Instructions: Ignition Module & Flywheel Refitting

Ignition Module & Flywheel Refitting

Repair Instructions: Centrifugal Clutch

Centrifugal Clutch Removal & Inspection

Centrifugal Clutch Refitting

Repair Instructions: Oil Pump

Oil Pump Removal

Repair Instructions: Oil Pump

Oil Pump Refitting

Repair Instructions: Oil Pump Refitting