Husqvarna 261 Chainsaw (Technical Specs)

The Husqvarna 261 is a discontinued, 61.5 cc, two-stroke professional saw. Its chain setup is commonly 3/8-inch pitch and .058-inch gauge, but confirm the bar, sprocket, and chain on your individual saw. Fuel mix, bar length, and tuning depend on its production version and condition; verify the correct manual before use.

If you are comparing older saws, the model number alone cannot tell you whether a used 261 is ready for work. Wear, past repairs, and mismatched parts can change how it performs and what replacement chain fits. I start with the markings on the saw itself, then check the manual and condition before treating any published specification as final.

This guide separates commonly listed specifications from details that must be confirmed on the individual saw. It also gives practical setup examples, explains the limits of bar-length advice, and lists the checks that matter before cutting.

Husqvarna 261 specifications

These figures describe commonly published specifications for the 261, not a guarantee that every production version or repaired saw matches them. The engine size and broad design identify the saw, while fuel ratio, chain fit, and tuning details need confirmation against the correct manual and installed parts.

Displacement is the total volume swept by the piston. At 61.5 cc, the 261 is a professional-class saw, but that number alone does not establish its power output, cutting speed, or ability to run a particular bar. I would not use a displacement-to-bar-length rule as a substitute for checking the saw’s setup and condition.

The common idle and maximum-speed figures are reference points, not tuning instructions. Carburetor settings and safe operating limits can vary by version and condition. If the saw needs adjustment, use the correct service information and a tachometer; do not set the high-speed screw by ear.

Key takeaway: Treat the table as a starting point. The manual and the markings on your saw decide the final setup.

Matching the bar and chain

A bar-and-chain match depends on three linked details: pitch, gauge, and drive-link count. Pitch is the spacing of the chain’s drive links; gauge is the thickness of those links where they sit in the bar groove. All three must suit the bar and drive sprocket fitted to your saw.

The 261 is commonly associated with a 3/8-inch pitch and .058-inch gauge. That is not enough information to order a chain with confidence. Check the bar stamp, sprocket, and existing chain, and count the drive links if the replacement chain is sold by link count.

Do not install .050-inch gauge chain just because it has the right pitch. The narrower drive links may not fit a bar and sprocket set for .058-inch chain. Use a different gauge only when the bar and sprocket are explicitly matched to it.

Bar length is a workload choice, not a fixed rule for every 261. Longer bars and hardwood cuts place more demand on the saw. If the engine bogs during a cut, reduce the cutting demand, use a shorter compatible bar where appropriate, or stop and inspect the chain and saw. Do not force the saw through wood.

Illustrative setup scenarios: These are decision examples, not claims about a specific original 261 package.

• Replacing a worn chain: Match the bar’s pitch and gauge, then confirm the drive-link count. Do not rely only on the old chain if its fit is uncertain.
• Changing bar length: Check that the replacement bar suits the saw’s sprocket and chain. Consider the wood and cut demands, then confirm the combination with the manual or a qualified service source.
• Investigating poor cutting: Check sharpness, tension, lubrication, and chain fit before blaming engine size. A mismatch or dull chain can make a sound saw seem weak.

Key takeaway: Buy by the markings and compatibility, not by model name alone.

Equipment Setup and Safety Preparation

Good preparation checks both the saw and the work area before the engine starts. On a used or long-stored 261, I would first look for altered or damaged parts, then verify the chain system and fuel guidance. If a safety feature fails or the setup cannot be confirmed, do not cut until it is repaired or identified.

1. Inspect the saw. Check the chain brake, throttle lockout, chain catcher, handles, fasteners, bar, chain, and tension. Look for cracks, missing parts, unusual wear, or damage. Confirm that the chain brake works according to the manual.
2. Prepare the site. Identify overhead hazards, the tree’s lean, wind, nearby targets, and bystanders. Set an exclusion zone and clear escape paths. Tree felling needs a planned approach; there is no single felling-clearance or hinge dimension that applies to every tree.
3. Wear protective equipment. Use a helmet, eye and hearing protection, chainsaw-rated leg protection, gloves, and boots. Follow applicable requirements, including ANSI Z133 and relevant OSHA rules for the work being done.
4. Confirm fuel and oil. Use the fuel ratio specified by the manual for that production version and the oil being used. Husqvarna specifies 50:1 (2%) with its two-stroke oil for many versions, but do not assume that ratio applies to every original manual or oil. Fill the separate bar-and-chain oil tank with suitable oil.
5. Check chain fit and tension. Verify pitch, gauge, and drive links. Set tension by the manual’s procedure; the chain should be correctly seated and able to move as specified. Confirm that oil reaches the bar tip using the manual’s check.

Start the saw on firm ground and follow the manual’s cold- or warm-start steps. Keep the chain brake engaged while starting, and release it only when ready to cut. Do not start or run the saw in a way the manual prohibits.

Key takeaway: If you cannot verify the fuel guidance, chain match, or safety controls, pause and resolve that uncertainty first.

Field Cutting and Landscaping Operation

The 261’s engine size does not remove the need to match the cut to the saw’s condition and chain setup. A sharp, correctly fitted chain and a controlled feed help the saw work as intended. If it bogs, stop and reassess instead of pushing harder or assuming a larger bar will solve the problem.

Use a two-handed grip and stable footing. Keep the bar nose clear of the wood, avoid overreaching and cutting above shoulder height, and do not cut with the bar tip. Rotational kickback can happen when the upper quadrant of the bar nose hits wood or another object; the bar can whip up and back toward the operator. A functioning chain brake helps reduce risk but does not make tip contact safe.

For planned tree felling, account for the tree, lean, hazards, escape route, and the saw operator’s training. Use a planned notch and sound hinge, and stop if the tree responds differently from the plan. Seek a qualified tree-felling plan where the job, tree, or surroundings make the cut uncertain.

If the saw begins to bog or cut poorly, stop and check for a dull or damaged chain, incorrect tension, poor oil delivery, or a pinched bar. Do not force a dull, incorrectly tensioned, or mismatched chain through wood. Stop, correct the setup, and inspect the bar, chain, and sprocket for damage.

When moving between cuts, engage the chain brake. Stop the engine before setting the saw down or servicing it. Allow it to cool before refueling.

Key takeaway: Controlled cutting and a compatible, sharp chain matter more than relying on displacement or bar length alone.

Maintenance, Sharpening, and Carburetor Tuning

Maintenance keeps the saw’s cutting system working together and helps reveal wear before it becomes a larger problem. On the 261, clean and inspect the chain, bar, oil passages, air filter, and clutch-cover area as needed. Use the correct manual for service intervals and settings because a legacy saw may have different parts or prior repairs.

Set the chain’s depth gauges to the chain maker’s specification. A depth gauge controls how much wood each cutter takes; 0.025 inch (0.65 mm) is common, not universal. Check the chain maker’s instructions rather than applying that figure to every chain.

Bar-oil flow depends on the saw setup and oil viscosity, which can change with temperature. Do not assume a fixed flow rate. Confirm delivery at the bar tip using the manual’s method, and check that the oil passages and bar groove are clean.

Clean the air filter and the area under the clutch cover. Inspect the bar groove, oil holes, chain tension, cutters, and drive links. Replace or service damaged parts with compatible components. If the saw cuts unevenly, pulls to one side, or fails to oil the chain, stop and inspect before continuing.

The commonly cited idle speed is about 2,500 rpm and maximum speed about 13,000 rpm, but confirm the exact manual for your saw. Use a tachometer for carburetor tuning; do not adjust the high-speed screw by ear. If you lack the correct service data or tools, have a qualified technician tune it.

Key takeaway: Follow the chain maker’s sharpening settings and the saw’s own service data, not a generic number alone.

Storage and Seasonal Care

Storage care protects the saw’s fuel system and cutting parts while making the next inspection easier. The right process depends on the manual and the fuel product in use, so follow those instructions rather than assuming one storage method suits every 261 or fuel blend.

After work, stop the engine, let the saw cool, and clean the air filter, clutch-cover area, bar groove, and oil passages. Inspect the chain and bar for wear or damage, and check tension before the next use. Refuel only after the saw has cooled.

For longer storage, follow the manual’s directions for fuel handling and the fuel product’s storage guidance. Keep the saw secure and out of reach of children. Before using it again, inspect the controls, chain brake, bar-and-chain match, tension, and oil delivery.

Key takeaway: A stored saw still needs a full safety and compatibility check before it returns to service.

Frequently asked questions

These answers focus on the details most likely to affect identification, replacement parts, and safe use. The individual saw’s manual and installed components take priority over general model references, especially when the saw is discontinued, modified, or has an uncertain repair history.

What is the displacement of the Husqvarna 261?
It is commonly listed as a 61.5 cc, air-cooled, two-stroke chainsaw.

What chain pitch does the 261 commonly use?
The common configuration is 3/8-inch pitch. Confirm the bar and drive sprocket markings before buying a chain.

Is the chain gauge .058 inch?
.058 inch is common, but check the bar stamp and sprocket. Do not substitute .050-inch chain unless the components are explicitly matched for it.

What fuel mix should I use?
Use the ratio in the manual for your production version and oil. Husqvarna specifies 50:1 with its two-stroke oil for many versions, but that is not confirmed for every original manual or substitute oil.

What bar length should I put on it?
Use a bar-and-chain combination confirmed for your saw, then consider the wood, cut, and saw condition. There is no single bar length that is right for every setup and task.

What are the commonly listed engine speeds?
About 2,500 rpm at idle and 13,000 rpm maximum are common published figures. Confirm the exact manual and use a tachometer for tuning.

What depth-gauge setting should I use?
Follow the chain maker’s specification. 0.025 inch (0.65 mm) is common, but it is not universal.

How can I check bar-oil delivery?
Use the method in the manual and confirm oil reaches the bar tip. Flow depends on setup and oil viscosity, so do not rely on a fixed rate.

Is the 261 suitable for felling trees?
It is a professional-class saw, but suitability depends on the saw’s condition, operator skill, tree, and site. Use a planned felling method and follow applicable safety requirements; get qualified help when the risk or uncertainty is high.

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