MS 400 C-M Petrol Chainsaw
Professional 4.0 kW chainsaw with magnesium piston technology
Overview
The new MS 400 C-M is the world’s first chainsaw with a magnesium piston.
The MS 400 C-M chainsaw has been designed with professionals in mind, offering STIHL’s highest performance in the 60cc class. More displacement, more power, more torque, only a small weight increase compared to the MS 362 C-M and an outstanding power to weight ratio.
The new 2-MIX engine provides 4kW of power,compared to 3.5kW in the MS 362 C-M, as well as more torque – 4.1 Nm vs 3.5 Nm. These increases come from larger displacement of 66.8cc, which is a 14% increase compared to the MS 362 C-M. The magnesium piston is also 14% lighter than the aluminum piston in the MS 362 C-M, helping ensure rapid acceleration.
Thanks to these intelligent design features, the MS 400 C-M has an impressive power-to-weight ratio of 1.45 kilograms per kilowatt, making it ideal to use when working in the forest, especially over prolonged periods. The powerhead on it’s own weighs 5.8 kg. In addition to the new 66.8 cc engine, the MS 400 C-M features STIHL’s latest M-Tronic 3.0 technology which has STIHL’s simple re-calibration procedure and an improved HD2 filter, which all help deliver optimum performance from the saw at all times.
The chainsaw also features Elastostart technology that enables effortless starting of the tool. Designed for forestry and arb professionals, the MS 400 C-M can be used for a range of applications, including felling, de-limbing and cutting timber down to size.
You can find videos showing you how to fill your machine with fuel and oil, fit bars and chains and start your chainsaw here.
Versions
Price-
MS 400 C-M - 40 cm / 16"£1,272.00*
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MS 400 C-M - 45 cm / 18"£1,284.00*
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MS 400 C-M - 50 cm / 20"£1,308.00*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Technical data

Technical data
Technical data | Value |
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Displacement cm³ | 66.8 |
Power output kW/bhp | 4/5.4 |
Bar length cm | 40-50 |
Bar length " | 16-20 |
Weight kg 1) | 5.8 |
Weight kg 2) | 6.88 / 6.97 / 7.07 / 7.11 / 7.13 |
Power-to-weight ratio kg/kW | 1.4-1.45 |
Sound pressure level dB(A) 3) | 107 |
Sound power level dB(A) 3) | 118 |
Vibration values left/right m/s² 4) | 3.5/3.5 |
STIHL Oilomatic saw chain pitch/type | 3/8 " |
Oil pump | Adjustable oil filter,einstellbar |
Tank volume l | 0.60 |
Chain pitch | 3/8" |
Chain tensioning | Lateral chain tension,seitliche Kettenspannung |
Sprocket - number of teeth | 7 Z |
Filter | Langzeit Filtersystem (Vorabscheidung) / Patronenfilter HD2,Long-term filter system (pre-separation) / cartridge filter HD2 |
Filter material | PET fabric,PET-Gewebe |
Bumper spike | Stahlkralle,Steel claw |
Cylinder | Chrom,Chrome |
Oil tank volume cm3 | 325 |
Sprocket | Ring sprocket,Ringkettenrad |
Anti vibration system | Standard AV-System |
Filler cap | Tool-free filler cap,WTV werkzeugloser Tankverschluss |
EPA Certified fuel consumption l/h | 2.265 |
CO2 g/kWh | 656 |
Handle type | Standard grip,Standardgriff |
Exhaust | Standard muffler,Standardschalldämpfer |
Carburettor | Compensator / Limiter Caps / carburettor heater / STIHL M-Tronic,Kompensator / Spülvorlage / Vergaservorwärmung / STIHL M-Tronic |
Speed at maximum power rpm | 10.000 |
Additional features | Ematic chain lubrication system,Ematic-Kettenschmiersystem |
EPA Certified fuel consumption glh | 0.598 |
1) Without fuel, without bar and chain
2) Without fuel, with bar and chain
3) K-factor according to DIR 2006/42/EC = 2.5 dB (A)
4) K-factor according to DIR 2006/42/EC = 2m / s ²
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Features

Standard features
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Cutting Attachments

Cutting Attachments
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Rollomatic E
The body is made of 3 electrically-welded metal plates, the middle plate is extensively hollowed out. Low weight, high stability.
Technical data Value Bar length 40cm/16",45cm/18",50cm/20",63cm/25" Sprocket pitch 9.32mm/3/8" Pitch 3/8 Inch Groove width 1.6 mm Groove width 1.6mm/.063" Number of teeth 11 Bar connection 3.003 Number of teeth on the sprocket 11 Bar type Stern-Rollomatic Versions
Price- Rollomatic E, 3/8", 1.6 mm, 40 cm / 16" £61.00*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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Rollomatic E
The body is made of 3 electrically-welded metal plates, the middle plate is extensively hollowed out. Low weight, high stability.
Technical data Value Bar length 40cm/16",45cm/18",50cm/20",63cm/25" Sprocket pitch 9.32mm/3/8" Pitch 3/8 Inch Groove width 1.6 mm Groove width 1.6mm/.063" Number of teeth 11 Bar connection 3.003 Number of teeth on the sprocket 11 Bar type Stern-Rollomatic Versions
Price- Rollomatic E, 3/8", 1.6 mm, 45 cm / 18" (Not for MS 661) £66.34*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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Rollomatic E
The body is made of 3 electrically-welded metal plates, the middle plate is extensively hollowed out. Low weight, high stability.
Technical data Value Bar length 40cm/16",45cm/18",50cm/20",63cm/25" Sprocket pitch 9.32mm/3/8" Pitch 3/8 Inch Groove width 1.6 mm Groove width 1.6mm/.063" Number of teeth 11 Bar connection 3.003 Number of teeth on the sprocket 11 Bar type Stern-Rollomatic Versions
Price- Rollomatic E, 3/8", 1.6 mm, 50 cm / 20" £73.84*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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Rollomatic ES
The STIHL Rollomatic ES (STIHL Ematic Super) is composed of a solid and particuarly rigid bar with a bar nose which can be replaced entirely. It is therefore ideal for most demanding professional tasks and is used chiefly on heavy duty machines for felling and bucking. Elliptically fomed, angled oil holes increase the flow speed of the chain oil, delivering optimal lubrication and even longer service life for the guide bar.
Technical data Value Bar length 50cm/20",63cm/25",75cm/30",90cm/36" Sprocket pitch 9.32mm/3/8" Pitch 3/8 Inch Groove width 1.6 mm Groove width 1.6mm/.063" Number of teeth 11 Bar connection 3.003 Number of teeth on the sprocket 11 Bar type Stern-RollomaticSuper Versions
Price- Rollomatic ES, 3/8", 1.6 mm, 50 cm / 20" £110.21*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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Rapid Super (RS)
High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.
Technical data Value Pitch 3/8 inch Drive link gauge 1.6 mm Chain pitch 9.32mm/3/8" Drive link thickness 1.6mm/.063" Required File size 5.2mm / 13/64" Versions
Price- Rapid Super (RS) 3/8" ,1.6 mm, 60 drive links, 40 cm / 16" £39.06*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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Rapid Super (RS)
High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.
Technical data Value Pitch 3/8 inch Drive link gauge 1.6 mm Chain pitch 9.32mm/3/8" Drive link thickness 1.6mm/.063" Required File size 5.2mm / 13/64" Versions
Price- Rapid Super (RS) 3/8", 1.6 mm, 66 drive links, 45 cm / 18" £43.02*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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Rapid Super (RS)
High performance saw chain for professional applications with low vibration levels, smooth cutting behaviour, low chatter and extremely high cutting and borning performance.
Technical data Value Pitch 3/8 inch Drive link gauge 1.6 mm Chain pitch 9.32mm/3/8" Drive link thickness 1.6mm/.063" Required File size 5.2mm / 13/64" Versions
Price- Rapid Super (RS) 3/8", 1.6 mm, 72 drive links, 50 cm / 20" £46.44*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Accessories

Accessories
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MotoMix
STIHL MotoMix is our patented premixed fuel, specially blended for ultimate performance.
This 50:1 ready-mixed fuel is a combination of premium non-ethanol, high-octane motor fuel for all STIHL 2-stroke engines which gives you optimum performance, excellent cold start properties, maximum acceleration over the entire rpm range and perfect running characteristics even with a sudden rev change.
MotoMix uses STIHL HP ultra-premium oil for exceptional engine lubrication and extreme cleanliness. It’s fully synthetic and biodegradable for optimal performance and long service life. MotoMix is user- and engine-friendly thanks to fewer emissions (free from ethanol; almost no olefins and aromatic compounds).
Can be kept in storage for up to five years.
Did you know:
- For MotoMix drums (55 l & 200 l), speak with your nearest STIHL Approved Dealer about direct delivery of the fuel to your preferred address. Find out more about our MotoMix promotion here.
Patent EP 2031043
Technical data Value Octane number >95 RON Octane rating 93 MOZ Benzene content 0.03 % Vol. Sulphur content 3 mg/kg Shelf life up to 5 Years Density at 15°C 690 kg/m3 Olefin content 0.1 % Vol. Vapour pressure at 40 °C 61 kPA Two-stroke oil content 1.8 % Vol. Versions
Price- MotoMix 5 l £25.00*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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ForestPlus chain oil
Based on high-quality mineral oils, ForestPlus is suitable for use with all chainsaws, including harvesters. ForestPlus delivers reliable chain lubrication and no resin build up, even during prolonged down times.
Versions
Price- ForestPlus chain oil - 5 l £26.54*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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HP Ultra 2-stroke engine oil
Fully synthetic oil with exceptional lubrication properties. Burns with extremely low residue due to ash-free additive. Suitable for continuous use under the most demanding engine conditions. Performance class: JASO-FB, ISO-L-EGB. Fuel/oil ratio 50:1. Recommended for STIHL 4-MIX engines.
Versions
Price- HP Ultra 2-stroke oil - 1 l (for 50 l) metering bottle £30.39*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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Varioclean
Water based, alkaline detergent specifically for dissolving and removing burnt-in resin and oil residue from your machine, and cleaning your tool’s housing, HD2 filter, wire mesh filter or PA filter. The detergent is biodegradable. Avoid contact with the eyes and keep out of reach of children.
To use Varioclean, first wait for your machine to cool down. Then, spray it onto the surface of the part you are cleaning and leave it for a maximum of 5 minutes, so the cleaner is not allowed to dry. Then, wash it off with water and wipe with a cloth to dry. We recommend you wear safety glasses when doing this.
Technical data Value Shelf life 3 Years Biodegradable Yes Versions
Price- Varioclean - 500ml £11.23*
* Manufacturer's recommended retail price updated as of May 2022. The manufacturer's recommended retail prices are subject to change without notice.
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The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Documents
Owners manuals and safety brochures
Languages | Date | Link |
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28/03/2022 |