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Model # CS-400-18

Store SKU # 834306

Store SO SKU # 1001755651

18 in. 40.2 cc Gas 2-Stroke Rear Handle Chainsaw

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  • Pro-grade ECHO chainsaw CS-400 cuts up to 32" diameter logs
  • Chainsaw reduced-effort starting system makes start ups a breeze
  • Great for cutting firewood (see reviews)
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Product Details

The gas powered ECHO chainsaw CS-400 is a rugged, professional-grade 18 in. chainsaw that cuts logs with up to a 32 in. Dia. This chainsaw's cutting power makes it great for cutting firewood. Packed with commercial-grade features for easy use and maintenance, the CS-400 includes a reduced-effort starting system and a 40.2 cc professional-grade, 2-stroke engine that delivers ample power for tough jobs. This built-to-last engine is also protected by a heavy-duty air filter and engine air pre-cleaner to protect against dust and dirt, so you can count on peak performance for years.
  • For questions about service and repair, please call Echo at 1-800-432-ECHO or reference the Service & Repair document
  • Use a 50:1 ratio of fuel to oil mix for 2-stroke cycle engines, recommend using only fresh gas with a minimum octane rating of 89 or higher (mid-grade to premium) at all times
  • 50:1 ratio equal 1 US Gal. 89 octane plus 2.6 fl. oz. ECHO PowerBlend Oil or ECHO Red Armor Oil
  • Gas powered chainsaw features a 40.2 cc professional-grade 2-stroke gas engine
  • Chainsaw comes with a 1-year commercial/5-year consumer warranty
  • Comes with 18 in. bar and chain provides reliable cutting performance
  • i-30 starting system with digital ignition delivers easy starting and smooth acceleration
  • Tool-less, easy access air filter
  • Heavy-duty air filter increases engine life
  • Side-access chain tensioner enables quick and easy adjustments
  • Automatic oiler keeps the chain lubricated for smooth operation
  • G-force engine air pre-cleaner maintains clean air supply to engine, helping protect against dust and debris
  • Safety tip (kick guard) sold separately as an accessory.
  • Return Policy
  • California residents



Questions & Answers

Q:Manual says tighten clutch cover nuts to 175-200 N-m (200-230 kgf-cm) . One of these values is wrong as they are not equal. I suspect the N-m is in error since 200 N-m is 147.5 ft-lbs. What is the correct value?
by|Aug 31, 2023
1 Answer
Answer This Question

A:  About 15 ft lbs should be ok. I just tighten it till it feels tight. I don't bring a torque wrench out into the field with me.

by|Sep 4, 2023
    Q:What is the fuel mix ratio
    by|Jul 8, 2023
    2 Answers
    Answer This Question

    A:  50 to1

    by|Sep 1, 2023
      1 found this answer helpful

      A:  Hello Timmy! The 2-stroke ECCHO products require a 50:1 fuel and oil mixture.

      by|Sep 1, 2023
        1 found this answer helpful
        Q:Does it come with a carrying case?
        by|May 9, 2023
        1 Answer
        Answer This Question

        A:  YES

        by|Sep 1, 2023
          5 found this answer helpful
          Q:Can I use a 24? bar and chain with this saw with no issues?
          by|Apr 10, 2023
          3 Answers
          Answer This Question

          A:  I do not know but I would not try to put a 24" bar and chain on my saw. You need to go to Echo for the answer. What do you plan to cut with a 24" bar? There will be at least a 25% increase in friction to drive the chain no-load and increase loaded power if you cut a larger tree. I do not know if the engine has the power. It will work but the stress will accelerate wear on the engine.

          by|Jun 29, 2023
            1 found this answer helpful

            A:  Hello! Thank you for your inquiry. The CS-400 is designed for use with a 16" and 18" bar and chain combination. It is not recommended for use with a larger bar and chain.

            by|Jul 5, 2023

              A:  No. 40cc is not a large enough motor to efficiently cut with a 24" bar

              by|May 12, 2023
                Showing 1-4 of 125

                Customer Reviews

                4.5 out of 5
                • 4.5
                  out of 2,110 reviews
                • 90% recommend this product
                Filter by:
                Showing 1-10 of 2,110 reviews
                Great saw for around the house
                I bought this needing a saw that could handle firewood and cleaning up trees around my woods. It does not disappoint. assembly was easy. starting it is easy. it's lightweight but rugged. I highly recommend this if you need that medium sized saw but don't want to spend $500 on the commercial version
                  • Recommended
                  CS 400 to me is hands down the best saw in its class.. I had one stolen I had for 3 years and broke my heart and finally bought another! You want to be happy always buy the best, my dad always said. I found that with Echo
                    • Recommended
                    This thing was under 2ft of flood water for a couple days thanks to Hurricane Ian & still runs like a top. Amazing product! Would buy again.
                      • Recommended
                      1 found this review helpful
                      "CARB Compliant"
                      The gas tank and bar oil tank are not see-through. So in order to fill them up, you have to add a little liquid, then shine a flashlight into the tank, and repeat. The one major problem is it is very hard to start. I choked it, primed the bulb, and pulled and pulled and would not start. I took the plug out and it is completely dry. This is a California Air Resources Board (CARB) compliant engine, meaning it is set up to run extremely lean. It finally does start after about 20 pulls.
                        3 found this review helpful
                        Going on four years, still love it.
                        I love this chainsaw. It's my go-to saw while my Stihl V.031 just sits around waiting. My CS-400 has the 18" bar and it's just right. We spend our summers in New Hampshire clearing our woodlot in order to build when (or if...) I retire. This saw doesn't quit. Starts right up every time. Don't run it without bar oil and flip the bar every time you change the chain and it will last forever. I can't think of anything I don't like about it and would buy another without giving it a second thought.
                          • Recommended
                          2 found this review helpful
                          Coming up short
                          Just got the CS-400 so called 18in saw. Measured the actual cut depth, it's only 17 at best. Echo needs to advertise what it will really cut, size does matter.
                            Wow. As a small woman, I couldn’t be more pleased with my Echo CS-400. It’s lightweight, a dream to start, and wicked easy to use. It took me less than 30 minutes to make short work of a pine that toppled during an ice storm. I appreciate the ease of maintenance on this model as well as the warranty. I’ll be recommending this saw to friends.
                              • Recommended
                              Can't change saw blade
                              The saw blade on this model is almost impossible to replace due to poor design. There is a clamp that has to go around the clutch and not enough room to spread the clamp out without modifying the body of the unit. Maybe the lawn mower repair shop has a special tool for this, at the end user should be able to change the blade without difficulty. The instruction manual doesn't even try to explain how to do it, probably because they know it's not well built and wants you to take it to somebody every time. I saw another YouTube videos that other models by Echo were not designed this way.
                                15 found this review helpful
                                Great Chainsaw
                                This is a great quality chainsaw. I used it for the first time today and went through two tanks of gas. It worked perfectly and starts on the first pull. I would highly recommend this chainsaw.
                                  • Recommended
                                  Very happy
                                  I have used several saws in my life. Some pretty big some small. This is a nice smaller/mid size saw. I have only ran a few tanks of fuel thru it at this time. But for what i was wanting and expecting i am very satisfied it starts very easy and has plenty of power for the size saw it is. I've cut some trees that took the entire 18 inch bar and it does a nice job. Hope it continues as is very satisfied
                                  • Verified Purchase
                                  • Recommended
                                  3 found this review helpful
                                  Showing 1-10 of 2,110 reviews

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                                  Bar Length (in.)18 in.14 in.12 in.14 in.
                                  IncludedChain, Scabbard, Scrench/Combination WrenchChain, Scabbard, Scrench/Combination WrenchChain, Scabbard, Scrench/Combination WrenchChain, Scabbard, Scrench/Combination Wrench
                                  Power TypeGasGasGasGas
                                  CA (CARB) CompliantCARB CompliantCARB CompliantCARB CompliantCARB Compliant
                                  Chainsaw Bar SizeMediumSmallSmallSmall
                                  Engine Displacement (cc)40.235.830.130.1
                                  Maximum Cut Diameter (in.)32 in28 in25 in25 in
                                  Handle TypeRear Handle ChainsawRear Handle ChainsawRear Handle ChainsawRear Handle Chainsaw
                                  FeaturesAntivibration, Chain Brake, Tool-Less Chain TensioningAntivibration, Chain Brake, Tool-Less Chain TensioningAntivibration, Chain Brake, Tool-Less Chain TensioningAntivibration, Chain Brake, Tool-Less Chain Tensioning
                                  THD SO SKU1001755651100420776110042000241000578181
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