
Do you have a question about the Stihl MS 251 C-Q and is the answer not in the manual?
| Chain Pitch | 3/8" |
|---|---|
| Vibration Levels Left/Right | 3.9/3.9 m/s² |
| Bar Length | 40 cm |
| Oil Capacity | 0.2 l (6.8 oz) |
| Chain Gauge | 0.050" |
| Bar Lengths Available | 40 cm |
| Emissions | EPA Phase II compliant |
| Engine Type | 2-stroke gasoline |
| Displacement | 45.6 cc (2.78 cu in) |
| Power Output | 2.2 kW (3.0 bhp) |
Explains symbols used on the machine and in the manual.
General safety regulations, local ordinances, and user responsibilities.
Explains the meaning of WARNING and NOTICE symbols in the text.
Explains how kickback occurs and its fatal consequences.
Instructions on safe and efficient cutting procedures.
Planning the tree fall direction and safe escape routes.
Steps to prepare the felling notch for directional cutting.
Positioning the saw and sequence for making the felling notch.
Explains dimensions of stump cuts for felling.
Technique for cutting into the trunk with the guide bar nose.
Felling cut procedure for trees smaller than guide bar length.
Felling cut procedure for trees larger than guide bar length.
Felling cut procedure for leaners, small diameter.
Felling cut procedure for leaners, large diameter.
Steps to remove the chain sprocket cover.
Steps to mount the tensioning gear.
How to retension the saw chain while cutting.
STIHL's ready-to-use fuel mix for optimal engine performance.
Guidelines for mixing gasoline and two-stroke engine oil.
Specifications for using high-quality brand-name gasoline.
Recommendations for using high-quality two-stroke engine oil.
Recommended mix ratio for STIHL 50:1 two-stroke engine oil.
Proper storage guidelines for fuel and fuel mix.
Steps to prepare the machine before fueling.
Explains different markings on tank caps and fuel tanks.
How to open the fuel tank cap.
How to open fuel caps with markings and symbols.
How to close fuel caps with markings and symbols.
Troubleshooting steps if the fuel tank cap cannot be locked.
Steps to prepare for filling the chain oil tank.
Instructions for filling the chain oil tank.
How to disengage the coasting brake function.
How to disengage the standard chain brake.
Explains how the chain brake is activated.
Explains inertia activation of the chain brake.
Adjusting the carburetor for winter conditions to prevent icing.
Recommendations for operation in warm temperatures.
Recommendations for operation in very cold temperatures.
Information on retrofitting or checking the air filter system.
Explains the different positions of the Master Control Lever.
How to set the Master Control Lever for starting and stopping.
How to use the manual fuel pump.
Describes how to hold the saw when starting.
How to start the engine on standard models.
Starting procedure for models with a manual fuel pump.
General starting procedure applicable to all models.
Guidelines for operating the new machine during its initial period.
General operating instructions and precautions during use.
Importance and frequency of checking chain tension.
How to check chain tension when the chain is cold.
How to check chain tension when the chain is warm.
Procedure after extended full-throttle operation.
Steps to take after completing work.
Recommendation to flip the guide bar to ensure even wear.
Cleaning procedures for oil pathways and bar groove.
How to measure guide bar groove depth.
Steps for removing the shroud.
Steps for refitting the shroud.
Description of the fleece filter for normal conditions.
Description of the HD2 filter for extreme conditions.
Steps for installing the air filter.
General information about the carburetor settings.
Factory default carburetor settings.
Troubleshooting steps when the engine stops during idling.
Troubleshooting steps if the saw chain rotates at idle.
Adjusting the carburetor for erratic idling or poor acceleration.
Adjusting carburetor for performance at high altitudes.
How to check the spark plug's condition and gap.
Steps to remove the spark plug.
Benefits of a sharp saw chain for efficient cutting.
Recommended sharpening angle for STIHL saw chains.
How the side plate angle is achieved with specific tools.
Choosing the correct sharpening tools based on chain pitch.
Instructions for clamping the guide bar during sharpening.
How to block the saw chain for safe sharpening.
Advice on frequent sharpening with minimal material removal.
Explanation of depth gauge function and setting.
Maintenance schedule for the entire machine.
Maintenance for various controls and levers.
Maintenance and checks for the chain brake.
Maintenance for the manual fuel pump.
Maintenance of the fuel pick-up body and filter.
Cleaning the fuel tank.
Cleaning the lubricating oil tank.
Checking and maintaining chain lubrication.
Maintenance for the saw chain, including tension and sharpening.
Maintenance for the guide bar, including cleaning and deburring.
Checking and cleaning the chain sprocket.
Maintenance and replacement of the air filter.
Technical specifications for the engine.
Technical specifications for the ignition system.
Technical specifications for the fuel system.
Technical specifications for chain lubrication.
Weight specifications of the machine.
Specifications for the chain sprocket.
Specifications for cutting attachments like guide bars and chains.
Data on noise and vibration levels according to standards.