The Most Common Problems with the Stihl MS 391 Chainsaw

Stihl Ms 391 is one of the popular chainsaws available in the market that professionals highly prefer as the quality of this chainsaw is unmatchable, and it provides the cutting speed of 6000 per minute, which is remarkable.

Like every other machinery, there are some problems attached to this chainsaw, which are referred to as Stihl Ms 391 Problems.

SurferHandy will discuss the issues related to Ms 391 in detail, along with their respective solutions for the reader’s ease.

Ms 391 is a high-quality chainsaw though the problems attached to it are the ones high-quality chainsaws can face.

The main issues include; a problem while starting the chainsaw, which happens due to sparking, compression or fuel problems.

Moreover, oil tank leakage can occur, which could be due to chainsaws being used for years, and it can lose power suddenly, which is a big problem as the task can remain incomplete and at times, that can cause more significant issues. 

Stihl Ms 391 Problems

Stihl Ms 391 problems are one of the main issues this high quality and high power model poses. These problems are not so significant, but if not appropriately dealt with on time, then these can become serious issues.

Hence, the main problems faced by this chainsaw are the leakage of the oil tank, failure of the sprocket and clutch seal, loss of power while working, and the primary power handling of the chainsaw.

This chainsaw is for professionals who are homeowners and have an interest in gardening; they may handle this machine while cutting the trees or branches in their gardens.

The article below discusses the problems that can occur to Ms 391 and their respective solutions. 

Some Common Problems Of Ms 391 With Their Solutions

Ms 391 chainsaw is one of the market’s best and most popular products; it has provided customers with satisfactory and outclass results while cutting and handling.

This chainsaw is easy to handle and has got more features when compared to other chainsaws available in the market.

Though like every other chainsaw, Ms 391 does have some glitches and problems, the good part is every issue has some solutions attached, which will be discussed in this part of the article. 

Problem While Starting Ms 391 

At times, Ms 391 causes problems while starting up, which happens due to several reasons, including spark, fuel and compression. To resolve these issues, first, you need to understand the problem in detail. 

To check the sparking plug, place the plug in front of the metal cylinder to see if sparking takes place; if the spark appears, then there is a problem, but if nothing happens, then this part of the chainsaw is correctly working.

Moreover, failure in coils and ignition modules can also occur, which should be avoided, though one should keep an extra spark plug to prevent immediate stoppage from working when the spark plug fails.

Simultaneously, fuel lines need to be checked regularly so that fuel issues if occurred then, must be cured on time.

In contrast, compression of the chainsaw may cause some problems at times as it may lay downwards when picked up from the starter cord, indicating that many injuries have taken place inside the chainsaw.

This should be cured immediately to resume the work of Ms 391; otherwise, the problem can increase to an irrevocable level.

Chain Stops Due To Dirty Air Filter 

Ms 391 Chainsaw may slow down due to the dust it absorbs inside the air filter or outside. The filter should be cleaned enough to work correctly. Otherwise, chainsaws can get slow, which leads to poor or bad results in working.

Though, at times it may stop, which can cause a break in the work as well. Especially when the chainsaw is not in use, it is essential to keep it clean so that dust may not accumulate or get fixed inside, which can either jam or obsolete the body of the chainsaw.

There are tools available which can be used to clear the dust from the air filter of the chainsaw Ms 391. Moreover, it is recommended to replace the chainsaw’s air filter with the new one at least once a time in the year, though this task should be done responsibly so that the chainsaw may not stop suddenly due to dirt inside the air filter.

If several users use the same chainsaw, then there must be better communication between them so that they may let each other know when the air filter needs replacement and timely cleaning of dust from the filter.

Power Lost Suddenly 

The most frustrating problem in Ms 391 so far is the failure of power suddenly without any reason. Power loss causes serious troubles at times, primarily when some sensitive and crucial task is being carried out, and that can not afford the stoppage in between the work.

In such cases, Ms 391 causes trouble for the chainsaw user and makes them frustrated about the use of this chainsaw. This may even result in heavy accidents if power gets lost during severe work.

To fix this issue, some things need to be considered frequently so that sudden cut-off from power may not take place. Make sure you are using the correct oil because old oil and oil Mobil can slow down the working of the chainsaw and cause a power cutoff.

Moreover, check for any air leakage as well because air leakage also leads to disruption in the working of the chainsaw. Replace the muffler of the chainsaw with the grander piston to see if it works properly without losing power.

Chain Sprocket And Clutch Seal Failure 

Ms 391 chainsaw has been found with the problem that the sprocket chain is designed in a way which is so tight to the purpose; due to the chain being extra friendly, the rubbing of the chain towards the drum or sprocket causes additional pressures, which leads to heating, damage and other issues in the chainsaw.

To fix this chain issue, nothing significant is required; loosen the chain so that it may not cause immense pressure against the drum or sprocket, generating heat and oil failure. The solution might seem to be easy, but if not done correctly and on time, then other problems can occur.

Crankshaft Oil Seal Failure 

Crankshaft oil seals fail to provide their work correctly at times, which happens because of the wrong assembling of the crankshaft while changing the oil. Once the crankshaft is attached or assembled, it wrongly will continue not to work accurately and can stop the working of the chainsaw’s engine.

Double-check the seal while assembling, and ensure it gets done correctly to avoid the issue. Moreover, check the pressure of the oil pump because if that is not correct, it may lead to problems while assembling the seal, as this can stop the spindle from rotating properly.

Poor Handling 

Ms 391 is known for the quality and power it offers to users. Though, at times users are unable to handle the power and torque of Ms 392 properly and fail to justify with this chainsaw which, as a result, leads to damage to the machine.

The solution is simple, and one should have sound knowledge of using such heavy and powerful machines. Moreover, proper instructions in the manual that comes along with the chainsaw must be read and followed correctly to avoid any mishandling.

While using an extension pole or standing ladder, extra care must be given, and nothing should be cut down that is more than 4 inches, with the view of safety measures.

Oil Tank Leakage

Chainsaws made by the Stihl company have mostly got the complaint of leaking oil tanks, which at times bothers a lot of the users, and the same problem is found in Ms 391, which is one of the highest quality chainsaws of Stihl.

Moreover, it has been seen that after use for ten years or more, the O-rings or seals inside the oil tank get damaged, which leads to leakages over the period.

The solution to stop the leakage is not so complicated; users need to have a regular check on the tank to see if it’s working correctly or not. Moreover, frequent cleaning of the oil tank is required so that oil may not stop inside or it does not get extra greasy and start accumulating fat inside.

Is It Still worth using Ms 391 

Ms 391 is one of the best products introduced by the Stihl in the market, and this chainsaw is priced in the market from $599 to $999 due to the irreplaceable and incomparable quality it provides to the users. This chainsaw is high in quality and can handle much more work as compared to other chainsaws of this range which makes Ms 391 one of the best in the market.

Moreover, Ms 391 is a pro chainsaw which can cut hardwood and other dense materials though the instructions need to be appropriately followed before doing such heavy work.

It is one of the professional chainsaws, which is why it also requires a decent investing speed and has a very high rate of cutting at 6000 per minute, which shows the ultimate high quality of the saw.

Moreover, Ms 391 has a feature of vibration control which enables the user to control the creasing vibration and keep on doing the work without any distraction.

Though this chainsaw is suitable for both homeowners and professionals, both need to take complete care while using it for cutting trees and branches and must follow the given instructions vigilantly.

Conclusion 

After reading the above article regarding Stihl Ms 391 Problems, a conclusion can be drawn that Ms 391 is a high quality and powerful chainsaw though it can cause some problems at times, which include; some of the seal’s failures such as; sprocket seal, clutch seal and crankshaft seal can crash and lead to chainsaw being stopped from work, power lost, oil leakage and some other issues as discussed above.

However, Ms 391 is a professional chainsaw which homeowners can use too, but only with a handling grip because any mishandling with the chainsaw can lead to significant issues.