Common Stihl MS 391 problems include starting difficulties, power loss, and idling issues. Users also report bar oil leaks and excessive vibration during operation.
The Stihl MS 391 chainsaw is a popular choice for heavy-duty cutting tasks but is known to encounter certain issues that can affect its performance and reliability.
Troubled owners often seek solutions for the saw’s finicky start-up process, which can be caused by factors such as a flooded engine or spark plug issues.
Consistent power delivery is critical for demanding cutting jobs, but the MS 391 can sometimes disappoint with unexpected power fades or stalls, often linked to carburetor complications or dirty air filters.
Further complaints typically include the chainsaw not maintaining idle or shutting down unexpectedly, potentially pointing to maladjusted carburetor settings or ignition troubles.
Proper maintenance routines, timely troubleshooting, and knowing the saw’s operational quirks are key to keeping the Stihl MS 391 running smoothly and efficiently.
Introduction To Stihl MS 391 Chainsaw
The Stihl MS 391 is a powerhouse meant for demanding landscapers and property owners who require robust performance and durability.
Designed to tick all the boxes for an efficient, high-performance cutting tool, the MS 391 is a go-to chainsaw for users who don’t compromise on power and ease of use.
Stihl MS 391 Features And Specifications
The MS 391 presents an impressive set of features engineered for user comfort and high efficiency. At its core is a powerful engine that delivers a remarkable power-to-weight ratio, making it one of the best options for heavy-duty tasks without causing fatigue.
Below is a snapshot of its key specifications:
|3.3 kW (4.4 bhp)
|6.2 kg (13.67 Ibs.) without fuel, bar and chain
|Guide Bar Lengths
|16″ to 20″ (recommended)
|600 cc (20.3 oz.)
|Chain Oil Capacity
|350 cc (11.8 oz.)
Durable construction and user-centric design are at the forefront, with features such as an advanced anti-vibration system, an adjustable oil pump, and an easy-access air filter lending themselves to both comfort and straightforward maintenance.
Regular Maintenance And Troubleshooting
Like any high-performance machine, the Stihl MS 391 requires consistent care to keep it running smoothly. Regular maintenance extends the life of the chainsaw, prevents malfunctions, and ensures the safety of its operation.
Proactive troubleshooting can help mitigate common issues such as:
- Starting problems, often due to spark plug or carburetor issues
- Chain wear and tear, which can be managed by regular sharpening and replacement
- Engine overheating, which may be prevented with correct fuel mixture and proper cleaning of cooling fins
- Idle running issues, correctable by adjusting the carburetor settings
Staying on top of these tasks ensures that the Stihl MS 391 continues to operate at its peak performance, coping with the rigorous demands expected of a top-tier chainsaw.
A well-maintained chainsaw becomes a dependable tool that any professional or homeowner would be proud to wield.
Starting Issues With Stihl MS 391
The Stihl MS 391 is a formidable powerhouse of a chainsaw, designed to tackle heavy-duty tasks with ease.
However, users may occasionally face some hiccups, especially when it comes to starting the machine.
Understanding these issues and their potential fixes can ensure you’re not left struggling with a stubborn chainsaw when there’s work to be done.
Difficulty In Engine Starting
When your Stihl MS 391 refuses to roar to life, it’s not just frustrating; it’s a barrier to productivity.
Common signs of trouble include the engine not turning over, or failing to start after several attempts—even with proper starting procedure.
Let’s dissect what might be behind these frustrations:
- A fouled or damaged spark plug can cripple your chainsaw’s ability to start.
- Incorrect fuel mix or stale fuel can prevent the engine from igniting.
- A dirty air filter may obstruct the airflow, hindering the starting process.
- If the carburetor is malfunctioning, it could be failing to mix the air and fuel correctly for combustion.
Reasons Behind Ignition Problems
Various elements can conspire to cause ignition problems with your Stihl MS 391 chainsaw.
Delving into the root causes, here’s what might be standing between you and a running chainsaw:
|Defective Ignition System
|Starts but shuts down due to the inability to vent gases.
|Check and replace the ignition coil or spark plug if necessary.
|Compromised Fuel System
|Fuel does not reach the combustion chamber.
|Clean or replace the fuel filter; ensure fresh, properly mixed fuel.
|The engine receives an improper air-to-fuel ratio.
|Inspect and clear the muffler and exhaust port of any obstructions.
|Engine receives an improper air-to-fuel ratio.
|Adjust the choke setting, ensuring it’s in the correct position for starting.
When you’re faced with a challenging start, don’t let despair set in. Often, these issues can be resolved with simple maintenance or adjustments.
Regular care and knowing how to troubleshoot can keep your Stihl MS 391 chainsaw an indispensable ally in your toolkit.
Power Loss And Performance Issues
When wielding the robust Stihl MS 391 chainsaw, experiencing a drop in power or a dip in performance can be more than an inconvenience—it can compromise your work efficiency and safety.
Over time, even the most reliable tools, like the Stihl MS 391, may confront challenges that lead to power loss and performance issues.
Understanding the common causes and knowing the quick fixes can be the difference between a frustrating experience and a swift return to peak operation.
Common Causes Of Power Loss
Power loss can manifest due to a variety of reasons, ranging from simple maintenance oversights to more intricate mechanical failures.
Here are several common culprits:
- A clogged air filter restricts airflow, suffocating the engine.
- Over time, spark plugs can become corroded or fouled, needing cleaning or replacement.
- Using old or incorrect fuel mix can cause poor engine performance.
- A blocked muffler can inhibit engine breathing, leading to power reduction.
Additionally, internal engine problems, such as a failing ignition coil or compromised carburetor, might be at play and necessitate professional inspection.
Quick Fixes For Reduced Cutting Performance
When grappling with reduced cutting performance, some swift remedies can help restore your MS 391 to its former glory. Consider these steps:
- Ensuring that the engine breathes freely is crucial for optimal performance.
- A fresh, properly gapped spark plug can make a world of difference.
- Drain old fuel from the tank, and fill it with a fresh, appropriate mixture.
- Clean out any carbon build-up or debris that might be causing obstructions.
Keep in mind that some issues, like a dull chain or improper tension, although not directly related to the engine power, can also reduce cutting performance.
Regular maintenance and proper chainsaw use will help minimize these problems.
Oil And Lubrication Problems
When it comes to maintaining your Stihl MS 391 chainsaw, one of the critical aspects to keep in check is its oil and lubrication system.
Ensuring that your chainsaw is well lubricated is not just about smooth operation; it’s about protecting the engine and ensuring efficiency and longevity.
Understanding Oil Leakage In Stihl MS 391
Oil leakage in your Stihl MS 391 can be a messy and frustrating issue.
It usually points towards a compromise in the chainsaw’s oil system, which can lead to a variety of problems:
- A damaged or improperly sealed oil cap can lead to oil leaking out of the reservoir.
- Over time, the plastic oil tank can develop cracks, causing oil to seep out.
- Worn-out seals around components can lead to leakage.
Regular inspection is key to identifying these issues early on and avoiding a potential decrease in your chainsaw’s performance or even engine damage.
Proper Lubrication For Chainsaw Longevity
Understanding the role of effective lubrication in the lifespan of your Stihl MS 391 is paramount:
- Adequate lubrication minimizes the friction between the chain and the guide bar.
- With less friction comes less heat, protecting the chainsaw engine from overheating.
- A well-lubricated chain cuts more effectively, reducing strain on the motor and conserving fuel.
Therefore, keeping an eye on the lubrication levels and applying oil correctly to your Stihl MS 391 are essential steps to ensure it remains in top condition for years to come.
Safety Concerns And Maintenance Tips
When handling powerful tools like the Stihl MS 391 chainsaw, prioritizing safety and regular maintenance is essential.
Problems or malfunctions can not only impede your work but also pose significant safety risks.
Understanding these concerns and following proactive maintenance routines will help keep both you and your chainsaw operating smoothly and efficiently.
Potential Risks Associated With Chainsaw Malfunctions
Operating a chainsaw like the Stihl MS 391 comes with inherent risks, particularly if the saw isn’t functioning correctly.
Recognizing these risks is vital for safe operation.
- When the chainsaw blade makes incorrect contact with wood or gets pinched, the saw can jerk back toward the user, potentially causing injury.
- A broken or dislodged chain can whip out, potentially causing cuts or other injuries.
- Malfunctions may lead to an unexpected loss of control, increasing the risk of accidents.
- Improper maintenance can lead to a buildup of sawdust and oil, which may ignite if the chainsaw overheats.
Essential Maintenance Practices For Preventing Issues
Regular maintenance not only extends the life of your chainsaw but also ensures safe operation.
Here are some practices to incorporate into your maintenance schedule:
|Air Filter Cleaning/Replacement
|After every use or when dirty
|Ensures proper air intake and prevents overheating
|When dull or after every few uses
|Maintains cutting efficiency and reduces kickback risk
|Chain Tension Adjustment
|Before each use
|Prevents chain dislodgement and ensures accurate cutting
|Fuel and Oil Inspection
|Before each use
|Prevents fuel system blockages and ensures proper lubrication
|Before each use
|Identifies any loose components or wear that may need addressing
Beyond these core tasks, it’s crucial to follow the manufacturer’s specific maintenance guidelines for the Stihl MS 391, which can be found in the user manual.
Staying on top of these practices will not only keep your chainsaw in top working condition but also help safeguard against potential malfunctions that could lead to safety hazards.
FAQs about Stihl MS 391 Problems
What Are Common Issues With Stihl MS 391?
Stihl MS 391 users frequently encounter problems such as starting difficulties, irregular idling, and bar oil leaks.
How To Troubleshoot Stihl MS 391 Starting Problems?
Check the spark plug, air filter, and fuel mix. Ensure the choke is properly used and that the carburetor is clean for optimal starting.
Can Carburetor Issues Affect Stihl MS 391 Performance?
Yes, a dirty or improperly adjusted carburetor can lead to performance issues like stalling or power loss in the Stihl MS 391.
What Maintenance Does The Stihl MS 391 Require?
Routine maintenance for the Stihl MS 391 includes cleaning the air filter, checking spark plugs, and lubricating the bar and chain.
How To Resolve Stihl MS 391 Oiler Malfunction?
Clear any blockages in the oiler holes, adjust the oiler screw if needed, and ensure the oil reservoir is clean and filled.
Encountering issues with your Stihl MS 391 chainsaw can be frustrating. Remember, regular maintenance can prevent most issues.
Should you need further assistance, consulting a professional is advised. Keep your saw in peak condition for optimal performance.