6 Common Stihl MS400 Problems and How to Fix Them

Alex Ortiz
By Alex Ortiz 22 Min Read
22 Min Read
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Hey there! 🌲 Have you heard about the Stihl MS 400 C chainsaw? Well, some people just call it the Stihl MS 400. It’s a pretty awesome tool that a lot of tree care experts and forestry pros use. One cool thing about this chainsaw is that it’s packed with the latest tech. That means it’s often better than many other chainsaws out there!

Now, imagine this: the chainsaw has a super long guide bar, but it’s not super heavy. So, you can move around and do your work without feeling like you’re lifting weights at the gym. But, like all tools, even this cool chainsaw has some quirks and issues.

Curious about what problems might pop up and how to solve them? That’s what we’re going to chat about today. Whether you’re new to chainsaws or a total pro, this article is just for you.

Alright, let’s jump right in and get to the good stuff! 🌳🔧

Stihl MS 400 Problems and Fixes: Quick Table

Before we dive deep into all the nitty-gritty details, I thought it’d be super helpful to give you a quick peek at some common problems you might face with your Stihl MS 400 chainsaw and their solutions. Whether you’re a seasoned pro or someone who’s just getting the hang of it, knowing what’s wrong can be half the battle!

Here’s a neat little table to help you out:

Stihl MS 400 Problems and Quick Solutions

Problems Here’s What to Do
Excessive oil slurping up fast Tweak the oiler just right.
Uh-oh, there’s oil dripping! Get a new oil line and O-ring.
The bar and chains are super dry Time for a cleaning! Check the oil filter and oil line. If needed, swap out that worm gear.
It just won’t start, help! First things first: freshen up or change that spark plug. Clean up the fuel line and its filter. Peek at the ignition module too.
Feels like it’s dancing or shaking too much Tighten up those engine mounts and make sure the guide bar’s snug. If the chain’s super tight, give it a little slack.
Engine’s acting all moody, running fast and slow Give your air filter, fuel filter, and fuel line a good clean. Remember, always use top-notch fuel and oil in the right mix.

Remember, chainsaws are machines. Sometimes, they need a bit of love and attention. Keep this table handy, and you’ll be well on your way to solving any hiccup your Stihl MS 400 throws at you. 😊🔧🌲

6 Common Stihl MS 400 Chainsaw Problems & How To Fix

Alright, pals! We’ve got our nifty table, but let’s chat a bit more about each problem. I’m going to walk you through 6 of the usual suspects when it comes to Stihl MS 400C chainsaw troubles. Don’t worry, these don’t happen all the time, but it’s always good to be prepared, right?

Problem 1: Excessive oil consumption

Alright, so our Stihl MS 400 chainsaw is a bit of a show-off with its fancy tech to save oil. But hey, even show-offs have their off days! If you see more oil than you’d expect on the chain or the guide bar, or if it looks like the chainsaw’s having a little oil party and splashing it everywhere, we’ve got a situation.

Why’s It Happening?

The oiler’s being a bit too generous. That’s leading to all that extra oil everywhere.

Here’s How to Set Things Right:

  1. Get to know your oiler. It’s got an adjustment screw on its underside.
  2. Grab a flathead screwdriver. Turn that screw clockwise to tell the oiler to calm down and use less oil.
  3. Want to see if you nailed it? Here’s a fun test: Put a piece of paper on the ground and let your chainsaw run over it for a bit. If there’s less oil this time, you’ve done it!

Remember, it’s all about finding that perfect balance. Too much oil isn’t cool, but neither is too little. So, always keep an eye out and adjust as needed. 😊🛠🌳


Problem 2: Leaking Oil

Alright, friends, our next problem isn’t unique just to the Stihl MS 400. It’s like the common cold for chainsaws: the notorious oil leak. Picture this: You’ve had a long day, you put your chainsaw to bed, and then wake up to find a little oil puddle. It’s as if the chainsaw had a little accident during the night. And if you’ve got an older chainsaw, well, this might happen a bit more often.

Why’s This Happening?

Two culprits could be behind this mischief:

  1. An oil line that’s seen better days and is now cracked.
  2. Those tiny O-rings might be damaged, and they’re letting the oil sneak out.

Here’s the Game Plan to Fix It:

  1. Let’s play detective. First, remove that oil line and give it a good look-over. Check for any cracks or signs of damage.
  2. Found a leak? It’s best to replace the oil line. No patchwork here; we want a brand-new one.
  3. Now, let’s not forget about those O-rings. Get new ones and replace the old, sneaky leakers.

Leaks can be messy, but hey, with a little patience and some detective work, you’ll have your chainsaw back in tip-top shape in no time! Remember, a happy chainsaw is a non-leaky chainsaw. 😁🔧🌳


Problem 3: Bars And Chains Are Not Being Lubricated

Okay, onto problem number three! We’re talking about chainsaws, right? So, the bar and chain getting the proper amount of oil is like us drinking enough water – super important! But sometimes, they’re not getting all lubed up. And trust me, this isn’t just a Stihl MS 400 thing. Many chainsaws throw this curveball.

Why’s This Happening?

  1. Dirt’s sneaky business: One big reason is all the gunk and dirt that collects in the oil filter and oil lines. Dirt’s basically throwing a block party and stopping the oil from reaching where it needs to.
  2. The worm gear’s being stubborn: This little part helps push oil onto the bar and chain. But if it’s misbehaving or broken, well, things are going to stay dry.

The Fix-It Strategy:

  1. Clean, clean, clean: Get in there and give the oil filter and oil lines a good scrubbing. Get rid of all that pesky dirt.
  2. Inspect the oil pump: Is it doing its job right? Make sure it’s working and giving the right amount of oil.
  3. Worm gear check: If that worm gear’s not working, it’s time for a replacement. No compromises!

Oh, and about that video? If you need a step-by-step guide on how to ensure your oiler’s working like a champ, there are tons of helpful videos online. Just give it a quick search, and you’ll be all set!


Problem 4: Not Starting

Alright, so we’ve all been there. You’re all pumped up, ready to tackle your task, and your chainsaw decides to play hard to get. It just won’t start! It’s like trying to wake up a teenager on a weekend morning. But hey, machines have their off days too.

Why’s This Happening?

  1. Dirty spark plug: Over time, our trusty spark plug can get clogged up with all sorts of dirt or simply wear out. It’s like its battery’s run low.
  2. Moody ignition module: This is the part that sparks things into action. If it’s faulty, well, no spark means no start.
  3. Fuel fiasco: If the fuel isn’t reaching where it should, or if there’s an issue with how it’s flowing, we’re gonna have a problem.

Alright, Let’s Roll Up Our Sleeves and Fix It!

  1. Spark plug spa day: First, give that spark plug a nice cleaning. If it looks like it’s had better days or seems super old, treat your chainsaw to a new one.
  2. Fuel line and filter TLC: Give them a thorough clean. Think of it as clearing the pipes in your home. Let that fuel flow!
  3. Ignition module inspection: Check it out and see if it’s working properly. If it’s acting up, swap it out for a shiny new one.

Starting issues can be super frustrating, I get it. But with a little patience and some troubleshooting, your chainsaw will be roaring back to life in no time! So, next time it’s playing hard to get, you’ll know just what to do. 😃🔥🌳


Problem 5: Vibrates Excessively

Okay, pals, here’s the deal: Chainsaws are supposed to be powerful, but they’re not supposed to shake like they’re in a dance-off. If your chainsaw’s giving you those jive vibes and shaking more than it should, that’s not only annoying but can also be tough on your hands and arms.

Why’s This Happening?

  1. Loosey-goosey parts: Even though our MS 400 chainsaw has fancy stuff like vibration control, sometimes parts like engine mounts and the guide bar can get a bit loose.
  2. Tight chain troubles: If that chain’s pulling too tight, it can get all riled up and make your chainsaw shake more than it should.

Alright, Here’s How to Calm Things Down:

  1. Check the engine mounts: Give them a once-over and tighten them up if needed. Think of these like the chainsaw’s shoes – we don’t want them to be loose!
  2. Guide bar check: If it’s wiggling around, tighten it up. It should be snug but not too tight.
  3. Chain adjustments: If it feels like it’s strumming a guitar solo, it’s probably too tight. Loosen it up a bit so it can move smoothly.
  4. Quick oiler check: Make sure that oiler’s doing its job right. It helps everything run smoothly.

Remember, a little shake is normal, but too much and it’s not only hard to control but can also be unsafe. Always aim for that sweet spot – a chainsaw that feels steady in your hands. Stay safe and keep things smooth! 😊🕺🌳


Problem 6: Engine Running At High And Low RPM Simultaneously

Buckle up! If your chainsaw’s engine sounds like it’s on a roller coaster, going up and down with its RPM, that’s a ride you don’t want to be on. An engine that can’t decide if it’s excited or sleepy can make any task a lot trickier.

Why’s This Happening?

  1. Bad fuel choices: Using low-quality fuel and oil is like feeding your chainsaw junk food. It’s not gonna perform its best.
  2. Mixing mishaps: Not getting that fuel-to-oil ratio just right can throw things off balance.
  3. Choked up air filter: If that air filter’s dirty, it can make your chainsaw’s breathing all uneven.

Time to Smooth Things Out! Here’s What to Do:

  1. Air filter spa treatment: First up, let’s get that air filter clean. If it’s beyond cleaning and looks like it’s been through a lot, treat your chainsaw to a new one.
  2. Fuel and oil check: Think of quality fuel and oil like the chainsaw’s favorite meal. Make sure you’re feeding it the good stuff. And get that mixing ratio spot on!
  3. Regular TLC: One of the best ways to keep your chainsaw humming smoothly is regular maintenance. Just like we need regular check-ups, so does your chainsaw.

Inconsistent engine speeds can be super frustrating. But with these steps, your chainsaw will soon be purring smoothly, making your job a whole lot easier. Here’s to smooth running and happy sawing! 😄🎢🌳


Key Specifications And Interesting Features Of Stihl MS 400

So, you’ve heard about the Stihl MS 400 chainsaw, right? But what makes it stand out? Why’s everyone raving about it? Let me break it down for you!

🔍 Key Specifications:

  • Engine Details: With a displacement of 66.80 cc and a power of 4.0 kW, this chainsaw is like the superhero of the chainsaw world!
  • Power Output: It can belt out a whopping 5.4 hp. Talk about muscle power!
  • Weight: This powerhouse is surprisingly light, weighing in at 12.8 lbs.
  • Fuel & Oil Tanks: It can hold 20.3 oz. of fuel and 11 oz. of oil. That’s quite a bit!
  • Bar Size: The recommended size is 20 inches. Perfect for those big tasks.

🎉 Interesting Features That Make It A Star:

  1. M-Tronic Brainy Engine: This is like the chainsaw’s computer brain. It ditches the old carburetor screws and sets the air-fuel mix just right. This means smoother running and even some fuel savings!
  2. Magnesium Magic Piston: For the very first time, this chainsaw’s got a piston made of magnesium alloy. It’s not only lighter but also gives a mighty power boost of up to 13%.
  3. ElastoStart Handle: Imagine a soft cushioned start to your chainsaw. No more yanking hard. It’s all smooth and shock-free.
  4. Quickstop Chain Brake: Safety first! If things go south, this brake stops the chain super-fast to avoid any mishaps.
  5. Ematic Lubrication System: It’s like the chainsaw’s personal spa treatment. It makes sure the chain and bar are always well-oiled, but without wasting a drop. In fact, it can save up to 50% of oil!
  6. Anti-vibration System: Nobody likes a shaky chainsaw. Thanks to this tech, the MS 400 is smooth and comfy to use, ensuring you don’t feel like you’ve been holding a buzzing beehive!

There you have it! The Stihl MS 400 is not just another chainsaw; it’s a chainsaw that’s been to college, got the degrees, and now, it’s showing off all its smarts and skills! 🎓🔥🌳

Some Drawbacks Of Stihl MS 400 Chainsaw

We’ve been singing praises about the Stihl MS 400 chainsaw, haven’t we? And it sure has earned them. But like that chocolate chip cookie with a bit too much salt, it has its quirks too. Let’s talk about the not-so-perfect parts of this chainsaw. But hey, nobody’s perfect, right?

1. Plastic Woes 🥴

  • What’s the issue? Those plastic handlebars and other attachments? Yeah, they scratch up quite easily. So, even with a little friction, your chainsaw might start looking like it’s been in a few battles.
  • Why’s it a bother? Nobody likes their shiny, new chainsaw to look all scuffed up after just a few uses!

2. A Little Thirsty 🥤

  • What’s the issue? If you decide to use a bigger guide bar (like 25 inches), this chainsaw tends to sip a bit more oil than you’d expect.
  • Why’s it a bother? Well, nobody likes wastage. And constantly refilling oil? Not fun!

3. Price Tag Shock 😲

  • What’s the issue? Some folks believe the Stihl MS 400C is a bit on the pricier side.
  • Why’s it a bother? We all want value for our hard-earned money. And while many believe it’s worth every penny, for others, that price tag can be a hurdle.

🎥 And hey, if you’re more of a visual person, there’s a video linked below that paints a clearer picture of these drawbacks.

In the end, while the Stihl MS 400 has its downsides, it’s still a powerhouse. Just remember to weigh the pros and cons before making your choice. 🌳✌️

User Feedback Regarding Stihl MS 400 Problems

If you’re thinking about getting the Stihl MS 400 chainsaw, or just curious about it, you’ve come to the right spot. Let’s peek into what a couple of real-life users said about their experiences. ‘Cause who better to spill the beans than folks who’ve actually used it, right?

1. The Slightly Thirsty MS 400 🥤

  • User’s take: This user put both his MS400 and MS462 chainsaws to work with a 25-inch guide bar. His observation? The MS 400 sips a bit more oil.
  • But wait… Even though it’s a bit more thirsty, he didn’t gripe about its performance. Seems like it still does the job pretty well!

2. The MS 400 Powerhouse 🚀

  • User’s take: Here’s someone who’s played around with quite a few chainsaw models – MS 391 and MS 462, to name a couple. But when it came to the MS 400? He’s all praises. Faster, more torque right off the bat, and it munches through a 30-inch log like it’s a snack!
  • In a nutshell? This guy’s in chainsaw heaven with the MS 400. Thumbs up from him!

The Bottom Line 🌟

What can we gather from this? The Stihl MS 400 chainsaw seems to be a crowd-pleaser, despite its little quirks. If you’re looking for something that packs a punch, this chainsaw might just be your jam!

And remember, it’s always cool to hear from different folks before making a choice. Everyone’s experience can give you a lil’ nugget of wisdom. ✌️

Wrapping up on Stihl MS 400 Chainsaw 🌲

Hey friend, let’s wrap our chat on the Stihl MS 400 chainsaw, shall we? 🛠️

Stihl didn’t just whip up the MS 400 on a whim. They crafted it with pros in mind, packing in those nifty, modern features. And the best part? It’s kinda like that friend who rarely lets you down. Issues with the MS 400? They’re few and far between. And fun fact: those tiny hiccups you might spot are pretty much the same ones you’d see with other chainsaw models too.

If you ever bump into an issue (which I hope you don’t), most of the time, it’s no biggie. Remember our chat about common problems and quick fixes? Keep that in your back pocket. Recognizing a problem is half the battle. Once you nail that down, patching it up is often a breeze.

Life’s too short for chainsaw headaches. And with the Stihl MS 400, you’re likely in for more smooth sailing than stormy seas. Just remember to keep an eye out for those small quirks, and you’ll keep that chainsaw humming and your work flowing.

Happy sawing and take care out there! 👋🌳🔧

Frequently Asked Questions

1: Why is my Stihl MS400 chainsaw not starting?

There could be several reasons for this issue. First, ensure that the spark plug is in good condition and properly connected. Check the fuel tank for sufficient fuel and make sure the fuel filter is not clogged. Additionally, check the air filter for dirt or debris, as a dirty air filter can prevent the chainsaw from starting.

2: My Stihl MS400 chainsaw starts but stalls frequently. What could be the problem?

This issue is commonly caused by a clogged or dirty carburetor. Cleaning or replacing the carburetor may solve the problem. Also, check the fuel lines for any blockages and make sure the fuel filter is clean. Incorrect fuel mixture or a faulty ignition system could also be contributing factors.

3: Why does my Stihl MS400 chainsaw produce excessive smoke?

Excessive smoke can be due to different factors. If the smoke is blue, it indicates that there is an oil-fuel mixture imbalance. Adjusting the oil-fuel ratio to manufacturer's recommendations should resolve the issue. If the smoke is black, it suggests an issue with incomplete combustion, which could be caused by a clogged air filter or a problem with the carburetor.

4: How do I address the problem of my Stihl MS400 chainsaw not cutting properly?

If the chainsaw is not cutting efficiently, it could be due to a dull or damaged chain. Sharpen or replace the chain as necessary. Ensure the chain tension is adjusted properly and the bar is in good condition. Lubricate the chain adequately to avoid friction-related cutting issues.

5: My Stihl MS400 chainsaw is vibrating excessively. What could be causing this?

Excessive vibration can be a sign of various issues. Check if the chain is properly tensioned and the cutting equipment is securely attached. A loose or worn-out bar or chain can also cause excessive vibration. In some cases, a faulty engine mount or clutch may be the cause.

6: What should I do if my Stihl MS400 chainsaw is leaking oil?

Oil leakage is often caused by a loose or damaged oil tank cap. Ensure the cap is tightly closed and not cracked. Check the oil tank for any signs of damage or cracks. If the issue persists, it is recommended to take the chainsaw to a Stihl authorized service center for further inspection.

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