Stihl MS 261 vs. Husky 550 XP Torque (Dyno Test)

The published specifications do not show which saw makes more torque: both current models are rated at 3.0 kW, and neither rating is a torque curve. I can’t name a dyno winner without matched, traceable test results that include RPM and setup details. Here’s how to compare the MS 261 and 550 XP Mark II fairly, and what the available figures do tell you.

If you have several tabs open, the near-identical power ratings may look like a tie-breaker. They are not. Power describes how quickly work is done; torque describes turning force at a given engine speed. To know which saw produces more torque, and at what RPM, you need a controlled measurement rather than a conclusion drawn from displacement or a brief cut.

I would first confirm the exact saw versions being compared, then look for the full dyno trace and test method. That keeps a promising-looking peak number from steering you toward a saw that may not match your bar, chain, or work.

What the published specifications establish

These manufacturer figures establish that the two saws occupy a similar engine class. They do not establish which makes more torque at a particular RPM, or which will cut faster in every setup. Treat them as useful context for a test, not as a substitute for one.

The power figures are effectively the same at the published precision. The small displacement difference is not enough to identify a torque winner. Nor should you assume that an earlier 550 XP shares the Mark II’s specifications: confirm the model generation and regional version before comparing data.

Bar length alone also does not identify a matched cutting setup. Gauge and drive-link count depend on the exact bar and chain package. Check the bar stamp and verify the saw’s bar and sprocket fit before ordering a chain.

What a useful torque dyno test must show

A torque test measures turning force as engine speed changes under a controlled load. Its value lies in the full curve and the test conditions, not just one peak figure. Without RPM, setup, and a repeatable loading method, a claimed dyno result cannot tell you how either saw will behave in a cut.

The relationship between power, torque, and engine speed is:

Torque (N·m) = 9550 × power (kW) ÷ engine speed (rpm)

That equation is useful only when power and RPM refer to the same measured operating point. The manufacturer-rated 3.0 kW figure does not provide a torque curve. Without a verified rated RPM or measured RPM-and-power data for the exact test, it is not sound to turn the rating into a supposed peak-torque result.

For an apples-to-apples test, hold these controls constant:

• Same model generation and regional specification, with model details recorded.
• Same bar length, chain pitch, gauge, and drive-link count.
• Chains with matching condition, sharpness, and tension.
• Fresh, correctly mixed fuel and the same fuel specification.
• Comparable engine temperature and a documented tune.
• The same dyno, loading method, and test procedure.
• Recorded torque and RPM throughout each pull, with repeat runs.

A single peak can occur at a speed the saw rarely uses under load. The more useful comparison is the torque curve across the working RPM range, alongside the test method. If a report gives only “peak torque” and no RPM or setup, I would not treat it as a buying-grade result.

How to read a dyno comparison without overclaiming

A dyno trace can show where each saw makes its strongest measured torque, and how that force changes as RPM rises or falls. It cannot automatically predict every field cut. Chain, wood, operator input, and saw condition all affect what you feel at the handles.

A credible report should identify the exact models and show torque against RPM. It should also explain how the saw was coupled to the dyno, how load was applied, and whether the displayed results are corrected or raw. Without those details, readers cannot judge whether the difference is repeatable or caused by the method.

In a comparison review, I would not call a saw the torque winner based on a cut video or sound alone. I would ask whether both engines were tested under the same protocol, whether the result repeated, and how large the measured difference was. If the curves overlap within the test’s variation, the practical result may be a tie rather than a meaningful advantage.

A useful report should include:

• Model and generation, including any regional version.
• Bar, chain, sprocket, fuel, and tune details.
• Torque and RPM data across the tested range.
• Dyno type, loading method, and repeat-run results.
• Test conditions and any limits on interpreting the data.

For this comparison, the verified specifications above are not a substitute for that dataset. So the honest conclusion is that published output alone does not settle which saw has more torque. If a seller or review claims a winner, ask for the trace and protocol before relying on it.

Matched field comparison: what it can and cannot tell you

A field comparison looks at cutting behavior with controlled saw setups, while a dyno measures engine output under a defined load. The field test can help connect a dyno result to work, but it is not itself a torque measurement. Keep the two kinds of evidence separate.

For a useful field comparison, use the same wood type and similar stem dimensions, matched bar-and-chain setups, sharp chains, and consistent cutting technique. Record cut time only alongside the conditions; a faster cut does not prove higher engine torque if chain sharpness, wood, or operator pressure differed.

I would log engine speed if reliable equipment is available, plus fuel, chain condition, and any interruption or binding. Repeat the cuts rather than relying on one pass. A saw that feels stronger in one cut may have been helped by a sharper chain or a different bite.

This is the practical case study to seek in reviews: a documented, repeated comparison that ties a matched setup to clear outcomes. It is not a reason to infer a dyno result from anecdotal reports. Use field evidence to judge workload fit, and use a controlled torque curve to answer the engine-output question.

Equipment Setup and Safety Preparation

Safe setup means checking the saw, cutting equipment, fuel, and work area before starting. These steps do not decide which model has more torque; they help ensure a comparison is fair and reduce avoidable risk during any test or field cut.

Wear a chainsaw helmet with visor and hearing protection, chainsaw-rated leg protection, gloves, and boots. Inspect the chain brake, throttle interlock, chain catcher, chain tension, bar-and-chain match, and lubrication. Set escape routes and keep bystanders clear. Follow applicable OSHA 29 CFR 1910.266 requirements where they cover the work.

Start each saw according to its specific manual, on stable ground with the chain brake engaged. Confirm the chain does not move at idle, then warm the engine before loaded cutting or measurement. Do not guess at carburetor adjustments; use the model-specific procedure and service limits. For a dyno pull, record the warm-up and test conditions so another tester can understand the result.

Field Cutting and Landscaping Operation

Field operation provides context for how a saw handles a task, but it does not replace a controlled dyno test. Use a sharp, correctly tensioned chain and a bar length suited to the stem and operator’s skill. Do not force the saw to make a comparison look faster.

Keep a firm two-handed grip and the guide-bar nose clear of wood and other objects. Contact with the upper quadrant of the bar nose can cause rotational kickback and throw the saw toward the operator. Use a functioning chain brake and compatible low-kickback equipment, and never cut above shoulder height.

When comparing cuts, keep the bar, chain, wood, and technique as similar as possible. If a chain dulls or a cut binds, stop and correct the issue rather than pushing harder. That protects the operator and prevents a poor test from being mistaken for a difference in engine torque.

Maintenance, Sharpening, and Tuning

Maintenance affects cutting performance and can distort a comparison. A dull chain, poor tension, blocked filter, or incorrect tune may change how a saw responds under load. Check both saws to the same standard before drawing conclusions from field work or dyno readings.

Use fresh fuel mixed at 50:1 with the manufacturer-approved two-stroke oil, as specified for both models. Never run straight gasoline in a two-stroke engine. Keep chain sharpness and tension consistent, and follow the manual for air-filter care, lubrication, and service. A chain that is forced through a cut can increase risk and conceal the saw’s actual condition.

If either saw runs poorly, resolve the cause using the manual or qualified service guidance before testing. Do not adjust carburetion by guesswork. Record any service or tuning changes; otherwise, the two results may reflect different maintenance states rather than model differences.

Shutdown, Storage, and Seasonal Care

A controlled shutdown and basic cleaning help preserve the saw and make later comparisons more repeatable. Follow the model’s manual, allow hot parts to cool, and inspect the cutting equipment before storage. These steps support reliable ownership, but they do not create missing torque data.

Engage the brake and shut down as directed in the manual. After the saw cools, clean the air filter, bar groove and oil ports, sprocket area, and cooling surfaces. Inspect the chain and bar, and prepare the saw for storage using the maker’s instructions.

For seasonal use, check the fuel and saw condition before the next start. Keep a note of the model generation, bar and chain package, service work, and any test measurements. That record makes future reviews and troubleshooting more useful.

Buying conclusion: what the evidence supports

The verified ratings put both saws at 3.0 kW, with nearly identical displacement. Those facts do not show which has more torque, where its torque peak occurs, or how either will perform with a particular bar and chain. A claim that one wins on torque needs a traceable, matched dyno test.

If torque is your deciding metric, ask for the full RPM-versus-torque data and the test controls listed above. If that evidence is not available, treat published power as a specification, not a verdict. Compare exact model version, intended setup, service support, and any credible field tests that match your work.

FAQ

Does the MS 261 or 550 XP Mark II have more torque?
The published specifications do not establish a winner. A matched dyno trace with torque and RPM is needed.

Do both saws have the same rated power?
Both are rated at 3.0 kW. STIHL lists 4.0 bhp for the MS 261; Husqvarna lists 4.0 hp for the 550 XP Mark II.

Does the slightly larger MS 261 displacement mean more torque?
No. Displacement alone does not show torque across engine speeds. Measured torque and RPM are needed.

Can I calculate torque from the 3.0 kW ratings?
Only at a known engine speed for that same power measurement. The equation is 9550 × kW ÷ rpm for torque in N·m.

What should a torque dyno report include?
It should identify the exact model and setup, explain the loading method, and show torque against RPM with test conditions and repeat results.

Are the earlier 550 XP and 550 XP Mark II interchangeable for comparison?
Do not assume so. Confirm the exact generation and regional specification before using a test or specification.

Do both saws use a 50:1 fuel mix?
Both manufacturers specify 50:1 when using their approved two-stroke oil. Use fresh, correctly mixed fuel and follow the saw manual.

Are their chains interchangeable because both commonly use .325-inch pitch?
Not necessarily. Gauge and drive-link count depend on the bar and chain package. Check the bar stamp and saw fit before ordering.

Can a faster field cut prove higher torque?
No. Cut time also depends on wood, chain sharpness, setup, and operator technique. It is useful field evidence, not a direct torque measurement.

What should I do if a review names a torque winner but shows no RPM?
Treat the claim as unverified. Ask for the torque curve, test conditions, and matched setup before using it to choose a saw.

(This article was written by one of our staff writers, Marcus Thorne. Visit our Meet the Team page.)