The STIHL MS 400 and its updated version, the MS 400.1, are professional forestry chainsaws designed for high-performance cutting.
While both models share a similar design and intended use, the MS 400.1 introduces several refinements that enhance usability, power efficiency, and maintenance.
Images from stihl.co.uk’s MS 400.1 listing.
STIHL MS 400 vs MS 400.1
The saw is expected to be released in the UK soon and is listed for £1,271.02 (US $1650).
The MS 400.1 press release shares many of the differences between the two models, but here they are stated in a fuller form.
1. Engine performance and displacement
The MS 400 features a 66.8 cc engine producing 4.0 kW of power, whereas the MS 400.1 has a slightly smaller 62.6 cc engine but maintains a comparable 3.9 kW output.
Despite the reduction in displacement, the MS 400.1 achieves a better power-to-weight ratio, making it more efficient for heavy-duty tasks.
2. Weight and handling
One of the most notable improvements in the MS 400.1 is its weight reduction.
Weighing 5.5 kg without fuel, bar, and chain, it is 200 grams lighter than the MS 400, which weighs 5.7 kg. This lighter design improves maneuverability and reduces fatigue during extended use.
3. Torque and cutting performance
The MS 400.1 provides 4.3 Nm of torque, compared to the MS 400’s 4.1 Nm.
This enhancement makes the updated model more resistant to bogging down when cutting through large timber, improving efficiency and control.
4. Cooling system enhancements
The MS 400.1 incorporates a larger magnesium flywheel and a redesigned muffler, which contribute to improved heat dissipation.
These modifications help keep the saw cooler during prolonged use, ensuring consistent performance and extending the lifespan of internal components.
5. Air filtration system
Both models use the HD2 air filter, designed to trap fine dust and resist oil and moisture.
However, the MS 400.1 features a larger filter, improving airflow and reducing the frequency of maintenance.
6. Ergonomic design and handling
The MS 400.1 features an improved rear handle design with a widened end profile, allowing for a more secure grip during plunge cutting.
Additionally, the optimized rib pattern on the underside of the saw helps it glide more smoothly along logs, preventing twigs and bark from causing obstructions.
7. Fuel management and maintenance
A new 50% fuel tank marker on the MS 400.1 provides a quick visual reference for fuel levels, allowing operators to monitor consumption more efficiently.
The oil pump control bolt has also been repositioned for easier access, making adjustments possible with a standard combination tool instead of a specialized screwdriver.
Magnesium piston
The STIHL MS 400.1 does not feature a magnesium piston.
Unlike its predecessor, the MS 400, which was notable for being the first professional chainsaw equipped with a lightweight magnesium piston, the MS 400.1 utilizes a traditional aluminum piston.
This change contributes to the MS 400.1’s reduced engine displacement of 62.6 cc, compared to the MS 400’s 66.8 cc. Despite this reduction, the MS 400.1 maintains a comparable power output of 3.9 kW, offering an improved power-to-weight ratio.
Comparison table
| Specs | STIHL MS 400 | STIHL MS 400.1 |
|---|---|---|
| Engine Displacement | 66.8 cc | 62.6 cc |
| Power Output | 4.0 kW | 3.9 kW |
| Weight | 5.8 kg | 5.5 kg |
| Torque | 4.2 Nm | 4.3 Nm |
| Power-to-Weight Ratio | 1.45 kg/kW | 1.41 kg/kW |
| Technology | M-Tronic | M-Tronic (latest version) |
| Flywheel | Standard | Larger magnesium flywheel |
| Air Filtration | Standard HD2 Filter | Larger HD2 Filter |
| Handle Design | Standard ergonomic handle | Improved rear handle geometry |
| Fuel Level Indicator | No | 50% fuel level marker |
Community comments
One thread in the Stihl Chainsaw Fans FB group asks, “400 or new 400.1?” And another asks if it’s worth the hype.
Here are some of the replies:
- Michael said, “400.1 and it’s not even close! Way more torque, nearly 1lb lighter than the current 400.”
- Jerad said, “The 400.1 is actually less power … changed pistons and made it a little cheaper the original 400 is the better of the 2 IMO.”
- Mark said, “Old 400. The new one aren’t better. I have both and talk from experience in the woods with both.”
- A.E. said, “Neither until the 400.1 lands in the states and we see how it really cuts. Until then, get a 462.”
- Lukas said, “We have until August 2025 till the new one comes out. I still have plenty of the original 400s in stock.”
Clayton said:
Stihl sent a couple of [400.1s] out for testing and I liked it.
We used them in logging and tree service work out here on the west coast and it did good. I also have a built older 400 that I was comparing it to.
Griffin said:
I’m still more interested in the current 400 with mag piston than this new replacement.
When a company touts the complications and expense of overbuilding the saw to accommodate the magnesium piston as the reason for the new model that’s just company speak for we found a cheaper, easier way to build the new saw and charge you the same money.
So if I don’t pick up a 400cm before all the old stock is gone and I’m left with only the new 400.1 option, I’d likely just step up to a 462 instead of being a beta tester.
And Austin said:
Could someone please send a request to Stihl kindly asking them to pick one model numbering system and sticking with it?
What are your thoughts?
