Ryobi RCS4640C User Manual (English)

Questions and Answers:

N
Nathan BrownAug 4, 2025
What to do if my Ryobi Chainsaw engine will not start?
- R
  Rebecca JordanAug 5, 2025
  If your Ryobi Chainsaw engine won't start, it could be due to a cracked or damaged spark plug. Replace it with a new one. If that doesn't work, the engine might be flooded. To fix this, turn off the ignition switch and remove the spark plug. Move the choke lever to the run position and pull the starter cord 15 to 20 times to clear excess fuel. Clean and reinstall the spark plug. Then, set the ignition switch to run, push and fully release the primer bulb 10 times, and pull the starter cord three times with the choke lever at run. If it still doesn't start, move the choke lever to choke and repeat the normal starting procedure. If all else fails, try again with a new spark plug.
D
Deanna MitchellAug 10, 2025
What to do if my Ryobi RCS4640C Chainsaw starts but will not accelerate properly?
- J
  jimmy44Aug 10, 2025
  If your Ryobi Chainsaw engine starts but won't accelerate properly, first check for lubricating function. Run the saw at half throttle for 30 to 45 seconds, then stop it and check if lubricant is dripping from the guide bar. If lubricant is present, the chain may be dull or the bar may be damaged. If there's no lubricant, contact a Ryobi service dealer.
K
Karen BrownAug 15, 2025
Why does my Ryobi Chainsaw engine not reach full speed and emits smoke?
- V
  vwilliamsonAug 15, 2025
  If your Ryobi Chainsaw engine does not reach full speed and/or emits excessive smoke, it could be due to several reasons. First, ensure you are using fresh fuel and the correct 2-stroke lubricant mix ratio. Also, the air filter or spark arrester screen might be dirty. In this case you should clean them. If the problem persists, it's possible that the carburetor requires adjustment, which should be done by a Ryobi service dealer.
B
Brandon HolmesAug 19, 2025
How to fix Ryobi Chainsaw that starts but will not idle?
- R
  Rachel HallAug 19, 2025
  If your Ryobi Chainsaw starts, runs, and accelerates but will not idle, you can try adjusting the idling speed screw “T”. Turn it clockwise to increase the idling speed. If the chain turns at idle, turn the screw anticlockwise to decrease the speed. Remember to wear protective equipment and follow all safety instructions.
J
jonescameronAug 25, 2025
Why is my Ryobi RCS4640C Chainsaw bar and chain running hot and smoking?
- R
  Ryan ShieldsAug 26, 2025
  If the bar and chain of your Ryobi Chainsaw are running hot and smoking, first, ensure that the chain brake is released. Also, check the chain tension, as it might be too tight. Inspect the guide bar and chain for any damage.
B
Bruce RodriguezAug 29, 2025
What to do if my Ryobi RCS4640C Chainsaw chain is not rotating?
- A
  Ann AguilarAug 30, 2025
  If your Ryobi Chainsaw starts, runs, but the chain is not rotating, ensure the chain lubricant tank is full. The lubricant tank should be filled every time the fuel tank is filled. Also, check the chain tension to make sure it is not overtight.

Ryobi RCS4640C Specifications

General

Brand	Ryobi
Model	RCS4640C
Category	Chainsaw
Language	English

Summary

READ ALL INSTRUCTIONS

Intended Use

Defines the specific purpose and limitations of the chainsaw for cutting wood.

Residual Risks

Lists potential hazards that remain even when the chainsaw is used as intended.

GENERAL SAFETY RULES

General Precautions

Offers important safety measures and advice for safe chainsaw operation.

Proper Clothing for Safety

Refuelling (Do Not Smoke!)

Provides safety instructions for handling fuel to prevent fire and burn injuries.

Basic Precautions in the Cutting/Work Area

Outlines essential safety measures to be taken in the area where the chainsaw is used.

Kick-Back

White Finger Risks

Discusses the risk of vibration-induced hand problems from prolonged chainsaw use.

Symbol

Instructs users to study and learn the meaning of symbols used on the product.

Service

Specifications

Description

Provides a numbered list of the main parts of the chainsaw for identification.

Operation

Understanding Your Chainsaw Safety Devices

Explains key safety features of the chainsaw, including chain brake and guide bars.

Low Kick-Back Saw Chain

Describes the characteristics and importance of using low kick-back saw chains.

Spiked Bumper

Explains the function of the spiked bumper as a pivot point for cutting.

Guide Bars

Discusses the influence of guide bar design on kick-back potential.

Chain Brake

Details the function and importance of the chain brake mechanism for safety.

Kick-Back Precautions

Offers specific advice and steps to prevent kick-back accidents and ensure safe cutting.

Fuel and Refuelling

Handling the Fuel Safely

Emphasizes critical safety rules for refueling, including avoiding sparks and spills.

Chain Lubricant System

Explains how to properly fill and maintain the chain lubrication system.

Starting the Engine

Guides users through the initial steps and precautions before starting the chainsaw engine.

Starting a Cold Engine

Starting a Warm Engine

Outlines the procedure for starting the chainsaw engine when it is already warm.

Stopping the Engine

Explains the correct procedure for safely shutting down the chainsaw engine.

Preparing for Cutting

Proper Clothing for Safety

Reinforces the importance of appropriate attire for safe chainsaw operation.

Proper Grip on Handles

Describes the correct way to hold the chainsaw for optimal control and safety.

Push and Pull

Proper Cutting Stance

Basic Operating/Cutting Procedures

Work Area Precautions

Lists important safety measures related to the work environment and bystanders.

Adjusting the Carburettor

Provides instructions and warnings regarding the adjustment of the chainsaw's carburettor.

Adjusting Idling Speed

Operating the Chain Brake

Felling Trees – Hazardous Conditions

Proper Procedure for Tree Felling

Outlines the correct steps and safety measures for felling trees safely.

Removing Buttress Roots

Bucking

Bucking with a Wedge

Describes the use of wedges to prevent pinching when bucking large logs.

Bucking Logs Under Stress

Offers specific advice for safely bucking logs that are under tension.

Overbucking

Underbucking

Limbing and Pruning

Cutting Spring Poles

Maintenance

Replacing the Guide Bar and Chain

Gives detailed instructions on how to replace the guide bar and chain safely.

Adjusting the Chain Tension

Chain Maintenance

Sharpening the Cutters

Top Plate Filing Angle

Side Plate Angle

Maintaining Depth Gauge Clearance

Maintaining the Guide Bar

Cleaning the Air Filter

Cleaning the Starter Unit

Cleaning the Engine

Checking the Fuel Filter

Replacing the Spark Plug

Cleaning the Spark Arresting Silencer

Chain Brake

Storing the Chainsaw (1 Month or Longer)

Troubleshooting

Troubleshooting (Continuation)

EC DECLARATION OF CONFORMITY

Related product manuals

Ryobi RCS4235B Type III

32 pages

Ryobi RCS4240B Type III

Ryobi RCS4640C User Manual

Table of Contents

Questions and Answers:

Ryobi RCS4640C Specifications

Summary

READ ALL INSTRUCTIONS

Intended Use

Residual Risks

GENERAL SAFETY RULES

General Precautions

Proper Clothing for Safety

Refuelling (Do Not Smoke!)

Basic Precautions in the Cutting/Work Area

Kick-Back

White Finger Risks

Symbol

Service

Specifications

Description

Operation

Understanding Your Chainsaw Safety Devices

Low Kick-Back Saw Chain

Spiked Bumper

Guide Bars

Chain Brake

Kick-Back Precautions

Fuel and Refuelling

Handling the Fuel Safely

Chain Lubricant System

Starting the Engine

Starting a Cold Engine

Starting a Warm Engine

Stopping the Engine

Preparing for Cutting

Proper Clothing for Safety

Proper Grip on Handles

Push and Pull

Proper Cutting Stance

Basic Operating/Cutting Procedures

Work Area Precautions

Adjusting the Carburettor

Adjusting Idling Speed

Operating the Chain Brake

Felling Trees – Hazardous Conditions

Proper Procedure for Tree Felling

Removing Buttress Roots

Bucking

Bucking with a Wedge

Bucking Logs Under Stress

Overbucking

Underbucking

Limbing and Pruning

Cutting Spring Poles

Maintenance

Replacing the Guide Bar and Chain

Adjusting the Chain Tension

Chain Maintenance

Sharpening the Cutters

Top Plate Filing Angle

Side Plate Angle

Maintaining Depth Gauge Clearance

Maintaining the Guide Bar

Cleaning the Air Filter

Cleaning the Starter Unit

Cleaning the Engine

Checking the Fuel Filter

Replacing the Spark Plug

Cleaning the Spark Arresting Silencer

Chain Brake

Storing the Chainsaw (1 Month or Longer)

Troubleshooting

Troubleshooting (Continuation)

EC DECLARATION OF CONFORMITY

Related product manuals