Husqvarna 550 XP vs. 543 XP (Weight & Power Test)

For the original models, the 550 XP weighs 4.9 kg and produces 2.8 kW; the 543 XP weighs 4.5 kg and produces 2.2 kW. The 550 XP is about 8.9% heavier, but has about 27% more rated power and the higher calculated power-to-weight ratio. Choose it for greater cutting reserve; choose the 543 XP when lower powerhead mass matters more.

What if the lighter saw feels easier to handle, but bogs down more often in the wood you cut? Or the more powerful model adds weight you rarely need? Those are the useful questions behind this comparison. The figures below are for the original 550 XP and 543 XP, not the 550 XP Mark II or other versions.

I compare the published powerhead weights and rated outputs first, then explain what those numbers can and cannot tell you about cutting. This is a specification-based comparison, not a controlled test of cutting speed, vibration, or fuel use. That distinction matters when you are choosing between two professional saws.

550 XP vs. 543 XP: Weight and rated power

Powerhead mass is the saw’s listed weight without the bar, chain, or fluids. Rated output is the engine’s stated power in kilowatts. Comparing both helps show the trade-off, but neither figure alone predicts how fast a saw will cut in your wood.

The 550 XP’s powerhead is 0.4 kg heavier, or about 8.9%. Its rated output is 0.6 kW higher, about 27% more than the 543 XP. These percentages compare the stated specifications; they do not mean the 550 XP will cut 27% faster.

Power-to-weight ratio means rated engine output divided by powerhead mass. Using the listed figures, the 550 XP is about 0.57 kW/kg, while the 543 XP is about 0.49 kW/kg. The 550 XP therefore offers more rated power for each kilogram of powerhead, but the ratio leaves out balance, chain sharpness, wood condition, and operator technique.

The weight difference is real, but it is only a powerhead comparison. A fitted bar and chain add mass, and the exact combination changes the complete saw’s feel. If you are checking a dealer listing, confirm the model and what the stated weight includes; do not treat powerhead mass as ready-to-cut weight.

Key takeaway: The 550 XP gives you more rated power for a modest increase in listed powerhead mass. The 543 XP is lighter, but its power-to-weight figure is lower.

What the power-to-weight figures mean in the cut

Power-to-weight is useful for comparing engine output against listed powerhead mass. It is not a direct measure of cutting speed or a guarantee that one saw will feel lighter in every cut. Bar and chain choice, chain condition, wood, and handling all affect the result.

The 550 XP has the larger engine and higher rated output. That makes it the more suitable choice when your work often asks for additional power, such as cutting larger material with an appropriate bar and sharp chain. It also gives more output on paper without a large powerhead-weight increase.

The 543 XP trades output for a 0.4 kg lighter powerhead. That can matter when you make many cuts, move between trees, or value a lighter saw in hand. But “lighter” does not automatically mean less tiring. Balance and the total fitted weight matter too, and those depend on the bar and chain.

Do not use displacement alone to decide what either saw can safely fell. Tree size is only one part of the assessment; lean, defects, wind, escape routes, and operator skill matter. For felling, use trained operators and follow applicable safety requirements, including ANSI Z133 and OSHA rules where they apply.

Key takeaway: Think of the 550 XP as the higher-output option and the 543 XP as the lighter powerhead. Neither specification proves a specific cutting time or safe felling capacity.

Which model fits your workload?

Workload means the kind of wood, cut frequency, and bar setup you handle in normal use. Matching those needs is more reliable than buying by displacement alone. Use the table as a starting point, then check the exact saw manual and bar markings.

Both are professional two-stroke saws suited to appropriately sized bars and routine tree-care or landscape cutting. They are not interchangeable in every setup. Both commonly use .325-inch pitch chains, but pitch is only one part of chain fit. Gauge, drive-link count, bar length, and sprocket setup must match the exact saw and bar.

Do not assume a chain that fits one configuration will fit another. Read the bar markings and the model’s manual before ordering a bar or chain. Nor should displacement by itself set a felling limit: assess the tree and site, and use qualified help when the work exceeds your training.

Key takeaway: Choose the 550 XP if the extra rated output serves your regular work. Choose the 543 XP if its lower powerhead mass better fits your routine. Confirm the complete bar-and-chain setup before purchase.

Field use: setup, cutting, and safety

Safe field use starts before the first cut. Check the site, saw, and protective gear, then verify the saw runs and oils correctly. A suitable model cannot make an unsafe setup safe, and extra engine power is not a substitute for good technique.

Before cutting, wear a helmet, eye and face protection, hearing protection, chainsaw-rated leg protection, gloves, and suitable boots. Inspect the chain brake, throttle lockout, chain catcher, handles, chain tension, bar, and controls. Plan escape routes and keep bystanders clear. Under OSHA logging rules, workers generally stay at least two tree lengths from a tree being felled, subject to applicable exceptions.

Start the saw using the model-specific manual procedure. Secure it, keep the chain clear of people and objects, and confirm it idles steadily with the chain stationary. Check that bar-and-chain oil reaches the cutting system before work. Do not tune the saw using guessed RPM figures; follow the manual and use a tachometer when required.

Use a sharp, correctly tensioned chain and an approved bar-and-chain combination. Keep a firm two-handed grip, stable stance, and awareness of the guide-bar nose. Contact between the nose’s upper quadrant and wood or another object can cause kickback, rotating the bar rapidly toward you. Keep that area clear and never rely on the chain brake instead of safe technique.

For felling, assess lean, defects, wind, escape routes, and hinge control. If you lack the training or conditions are uncertain, stop and use a qualified operator. The 550 XP’s higher output does not make a difficult tree safer to fell; the 543 XP’s lower mass does not remove the need for the same care.

Key takeaway: Select the saw for the work, but keep safety decisions separate from the power comparison. Both models require sound setup and trained operation.

Fuel, chain care, and shutdown

Routine care helps preserve cutting performance and lowers the chance of avoidable engine or chain problems. Use the correct fuel mix, keep the chain in good condition, and follow the manual for maintenance. A more powerful saw still cuts poorly with a dull chain.

Husqvarna specifies a 50:1 fuel-to-oil ratio, or 2%, with its approved two-stroke oil. Do not use straight gasoline or an incorrect mixture; inadequate lubrication can cause rapid engine damage, including seizure. Follow the manual for fuel, oil, starting, and service procedures for the exact model.

If the saw cuts poorly, inspect the chain before pushing harder. Stop if it is dull, damaged, or incorrectly tensioned, then correct the condition. Forcing it through wood increases effort without fixing the cause. After work, switch off and let the saw cool in a safe place.

Clean cooling areas, the sprocket cover, bar groove, and oil passages. Check the chain for damage and tension, and maintain the bar and chain as directed by the manual. Refuel only after the saw cools, away from ignition sources. Follow the manual for storage and transport.

Key takeaway: Correct fuel mix and chain care matter on both saws. If performance drops, check the chain and setup rather than forcing the cut.

Conclusion: which one should you buy?

The original 550 XP is the stronger specification choice: 2.8 kW at 4.9 kg, with a calculated 0.57 kW/kg. The original 543 XP is lighter at 4.5 kg, but its 2.2 kW output gives a lower calculated ratio of 0.49 kW/kg.

For frequent work that benefits from more output, the 550 XP is the clearer fit. For routine work where lower powerhead mass is more valuable than the extra rated power, the 543 XP may suit you better. Before buying, verify that the listing is for the original model, check what its weight includes, and match the bar and chain to the manual. The numbers support a choice; they do not replace a safe, workload-specific assessment.

FAQs

These short answers focus on the original models and the figures that distinguish them. They clarify what the published specifications show, what the calculated ratio means, and what to check before choosing a bar or chain.

Which is more powerful, the 550 XP or 543 XP?
The original 550 XP has 2.8 kW rated output. The original 543 XP has 2.2 kW.

Which saw is lighter?
The 543 XP is lighter by powerhead mass: 4.5 kg versus 4.9 kg for the 550 XP. Both figures exclude bar, chain, and fluids.

Which has the better power-to-weight ratio?
The 550 XP is about 0.57 kW/kg, compared with about 0.49 kW/kg for the 543 XP. These are calculated from rated output and powerhead mass.

Is the 550 XP about 27% faster?
No. Its rated output is about 27% higher, but that does not establish cutting speed. Wood, chain condition, bar setup, and technique affect cutting.

How much heavier is the 550 XP?
Its listed powerhead mass is 0.4 kg greater, about 8.9% more than the 543 XP’s 4.5 kg.

Do both models use a .325-inch chain?
They commonly use .325-inch pitch chains, but pitch alone does not confirm fit. Check the exact bar, gauge, drive-link count, sprocket setup, and manual.

Is the 550 XP Mark II the same model?
No. The specifications here apply to the original 550 XP, not the later 550 XP Mark II. Check the full model name before comparing listings.

What fuel mix should I use?
Husqvarna specifies 50:1, or 2%, with its approved two-stroke oil. Confirm the instructions in the manual for your exact saw.

Does the larger displacement make the 550 XP the right felling saw?
Not by itself. Tree condition, lean, wind, escape routes, operator training, and site rules all matter. Displacement does not set a safe felling limit.

Which model should I choose for landscape work?
Choose based on the wood and cut frequency. The 550 XP provides more rated output; the 543 XP has lower powerhead mass. Match either saw to an approved bar and chain.

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