Chainsaw Won’t Start When Hot: 4 Easy Ways To Fix It Now

Alex Ortiz
By Alex Ortiz 13 Min Read
13 Min Read
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Hey there! Have you ever been in a situation where your trusty chainsaw just refuses to start when it’s hot, even though it was all good when cold? If you’re nodding your head and thinking, “Yep, that’s me,” then you’re in the right place!

Great question! There could be a bunch of reasons why this pesky problem happens. Maybe the chainsaw isn’t getting enough gas. Or perhaps there’s something called a fuel vapor lock messing things up. But don’t worry, there are ways to fix these issues! You could try cleaning out any gunk or dirt that might be blocking things. This might help let out any trapped vapors.

It’s okay to feel a bit overwhelmed. Chainsaws can be tricky! But that’s why we’ve put together this super handy guide just for you. In it, we’ll dive deep into all the possible reasons your chainsaw’s being stubborn when it’s hot. And the best part? We’ve got some super simple solutions for each problem!

Keep on scrolling, and let’s get that chainsaw up and running again! 🛠️🌲

Reasons Why Chainsaw Hard to Start When Hot And The Solutions

Ever noticed your chainsaw behaving like a moody teenager? Works like a charm when it’s cold but throws a fit when it’s hot? Let’s explore why that happens!


Look, chainsaws can sometimes have their little quirks. The key is understanding what’s going on and knowing how to handle it. Think of it like a puzzle. First, you gotta know all the pieces, then you can put them together!

Starting a Hot Chainsaw: What’s the Deal?

Before we jump into the solutions, it’s super important to understand why the chainsaw acts up when it’s hot. And guess what? We’ve got a neat little breakdown for you right here!

Reason 1: The Sneaky Fuel Vapor Lock

Ever heard of this? It’s the number one troublemaker for chainsaws. Imagine this: the chainsaw’s gas tank gets too much heat and starts making vapors. But these vapors can’t escape because they’re not being vented out properly.

If you leave your chainsaw out under the sun for a long time (like a sunbathing session), this is bound to happen. The heat makes more and more vapors in the fuel lines, blocking the fuel from flowing nicely to the carburetor.

What you get is a weird fuel mixture. At first, the chainsaw might seem like it’s starting just fine. But, the moment you give it a little gas, the heat makes even more vapors. And bam! The fuel can’t flow, and your chainsaw gives up on you.

Gotcha Solution!

Want to stop this from happening? Here’s the game plan:

  1. Check the vents: These little guys are supposed to let the vapors out. Make sure they’re not blocked with dirt or other junk. If your chainsaw is acting up, try opening the gas cap to let out the vapors. Then try starting it again.
  2. Spot the problem: If the chainsaw starts after venting, you’ve caught the culprit: vapor lock. Now, take a closer look at the vent hole in the fuel tank. Is it blocked? Is it looking a bit worse for wear? Grab a cleaner and brush, and give it a good scrub.⚠️ Heads up! All cleaners are not chainsaw-friendly. Here’s a couple that gets our thumbs up:Weiman Stainless Steel Cleaner Kit – Get Now!

    Therapy Stainless Steel Cleaner Kit – Get Now!

  3. Breathe in, breathe out:
  4. Leave the fuel cap open for a bit, let the pressure chill out. Once you’ve given it some time, close it up and give your chainsaw another go!

Reason 2: Plugged Carburetor

Okay, moving on to another common culprit: the carburetor. Think of the carburetor as the chef of your chainsaw. It’s where the fuel and air get mixed up in just the right amounts to keep things running smoothly.

Why is the Carburetor So Important?

For your chainsaw to run like a dream, it needs a special recipe of air and fuel. This mix has to be just right – kind of like Goldilocks’ porridge. If you peek into your fuel, over time, some stuff in there can turn into a gunky, white residue.

Guess what? This gunk can block the carburetor’s jets. And when that happens, the fuel can’t flow to the engine the way it’s supposed to. The engine ends up getting super hot and can give up on you. By the way, if you own a Husqvarna 562xp chainsaw, this might sound familiar!

Fixing the Carburetor: Let’s Get to Work!

If you suspect your carburetor is the problem, don’t sweat it! Here’s what you need to do:

  1. Grab a Carburetor Repair Kit: These kits are like magic potions for your carburetor. They have all the tools and parts you need to give it a makeover.Here are a couple of top-notch kits to consider:Carburetor Rebuild Kit for Edelbrock.

    MOTOKU Pack of 4 Carb Carburetor Rebuild Kit.

  2. Time for a Clean-Up: First, you’ll need to remove the carburetor. Start by taking off the air filter. Got it? Awesome! Now, a carburetor cleaner spray is your best friend here. It works wonders in getting rid of all that nasty gunk stuck in the jets. Once you spray and clean, it can help your carburetor get back to its prime.
  3. Final Touches: After your cleaning session, make sure there’s no leftover fuel residue in the carburetor. We want it sparkly clean!

And voila! Your chainsaw should be feeling much better now. Ready to tackle the next potential issue? Let’s keep going! 🌟🔧🌲

Reason 3: Defective Ignition

Alright, onto our third suspect: the ignition. Think of the ignition as the spark that sets everything in motion. It’s like the starter pistol in a race!

What’s the Deal with the Ignition?

Here’s a quick breakdown: the spark plug electrode in the engine kicks things off by creating a spark. And guess what? This can sometimes act up, especially in chainsaws that use Milwaukee batteries. (By the way, storing those Milwaukee batteries the right way can save you a lot of future headaches!)

Take a close look at the electrode. Does it look a bit worn down? Do you see any black carbon building up on it? That’s not a good sign. This kind of buildup can happen after you’ve used your chainsaw for a while, and it can mess with the spark’s quality. Oh, and if you have a Homelite chainsaw that’s refusing to start, this might be the troublemaker.

Ignition Issues? Here’s Your Game Plan!

Facing ignition woes? Don’t fret! Here’s how you can tackle it:

  1. Check the Spark Plug: If the electrode looks like it’s seen better days, it’s time for a change. Replace the spark plug to give your chainsaw a fresh start.
  2. Test It Out: A neat trick to test your spark plug is by using some starter fluid through the choke valve. Give it a try and see if your engine starts.
  3. Still No Luck?: If your engine either doesn’t start or starts and then quickly stops, the problem’s definitely in the ignition. It’s time for some repair work!

Reason 4: Inadequate Compression

Alright, let’s dive into another area that might be giving your chainsaw a hard time: compression. It’s like the heartbeat of your chainsaw. Without the right compression, your chainsaw just won’t feel right.

Why is Compression So Crucial?

Every time you use your chainsaw, it needs to squeeze the air-fuel mixture super tight. This squeeze heats things up, making sure the chainsaw has the power it needs. But, if you’ve got a Poulan chainsaw, you might have bumped into a little hiccup. You see, these chainsaws have a unique design with single-piston rings. Over time, this can lead to some wear and tear.

If you dig deep, you might find everything else is working just fine, but the piston ring has worn out. This ring is super important – it keeps gases from sneaking out and makes sure everything’s pressurized just right during the compression phase. But, with too much heat, the piston can wear out faster, messing up the compression.

So, How Do We Fix It?

  1. Run a Compression Test: Before anything else, test out your chainsaw’s compression. Do it when it’s cold, and then again after it’s been running and gets hot.
  2. Grab a Compression Tester: If you don’t have one, no worries! These tools are easy to find online or at your local hardware store. Plus, they won’t break the bank.Here are a couple we’ve found super useful:AZUNO Compression Tester Automotive, Digital Compression Gauge.

    BETOOLL HW0130 8pcs Petrol Engine Cylinder Compression Tester Kit.

  3. Get Testing: Once you have your tester, plug it into the spark plug socket. Give the cord a good tug when the chainsaw is both cold and hot. Keep an eye out for any difference in engine pressure.
  4. Spot the Difference: If there’s a change in pressure, it’s a sign there might be an issue with the piston and cylinder. Depending on what’s going on, it might be time to treat yourself to a new chainsaw.

This method might also work if you’re trying to get a warm Stihl chainsaw up and running.

If all this feels a bit overwhelming, don’t panic! TheRepairSpecialist has a super helpful video that’ll guide you through the steps. Give it a watch and you’ll feel like a chainsaw pro in no time!

Keep those chainsaw vibes strong, and let’s keep exploring! 🌟🔧

Wrapping Up

So, did we help clear up the mystery of why your chainsaw acts a bit moody when it’s hot? We sure hope so!

Before you dive into fixing things, take a moment to really figure out what’s going on. Use this guide as your trusty sidekick – it’s here to help you spot the signs and get things back on track. And hey, when you’re working with chainsaws, always prioritize safety. Better safe than sorry, right?

That’s it from us for now. Here’s to smooth chainsaw sessions and happy days ahead! Stay safe and take care! 🌟🌲👋🏼

Frequently Asked Questions

1. Why won't my chainsaw start when it's hot?

A common reason why a chainsaw won't start when it's hot is a flooded engine. When the engine is hot, excess fuel can enter the carburetor, causing it to flood. This prevents the spark plug from igniting the fuel-air mixture, making it difficult to start the chainsaw.

2. How can I fix a flooded engine?

To fix a flooded engine, follow these steps:
  • Remove the spark plug
  • Pull the starter cord several times to clear out the excess fuel
  • Clean or replace the spark plug
  • Reinstall the spark plug
  • Start the chainsaw as usual

3. What if my chainsaw's spark plug is damaged?

If your chainsaw's spark plug is damaged, replace it with a new one. A damaged spark plug can prevent the ignition system from functioning properly, leading to starting issues. Be sure to choose the appropriate spark plug for your chainsaw model.

4. Could a clogged air filter be the reason for the starting problem?

Yes, a clogged air filter can cause starting issues. When the air filter is clogged, air cannot flow freely into the carburetor, resulting in a rich fuel mixture. This can make the chainsaw difficult to start or cause it to stall. Cleaning or replacing the air filter may solve the problem.

5. What should I do if the fuel in my chainsaw is old?

If the fuel in your chainsaw is old, it can cause starting problems. Old fuel can clog the carburetor or make it difficult for the fuel to ignite. Drain the old fuel from the chainsaw's tank and replace it with fresh fuel mixed with the appropriate oil-to-gas ratio.

6. When should I consider seeking professional help?

If you have tried the troubleshooting steps mentioned above and your chainsaw still won't start when hot, it may be best to seek professional help. A certified technician can diagnose and fix any complex issues that may be preventing your chainsaw from starting.

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