The Husqvarna 550 XP is a popular professional‑grade chainsaw. However, like any high‑performance tool, it has some known weaknesses and quirks.
If you own or are considering a 550 XP (or the Mark II version), this guide can help you maintain it better and avoid headaches.
Husqvarna 550 XP Problem
1. Difficulty Starting / “Hot Start” Problem
One of the most frequent complaints is that the saw is hard to start when it’s cold, and that restarting it when it’s hot can also present issues.
- Many users report that the 550 XP will jerk violently when pulling the cord from a fully retracted rope, especially if the engine is cold.
- The “hot start” issue: the saw may run fine when warm, but starting it right after shutting down (while still hot) may cause problems.
What to do:
- Follow the proper cold‑start and hot‑start procedures exactly (primer, choke, high idle, etc.). One user found success by letting the saw reach full throttle mode for a bit so the “computer” (autotune) can adjust.
- Check that the spark plug is clean and has the correct gap. A fouled plug can make starting harder.
- Verify fuel quality and correct mix, and confirm that the decompression button (if equipped) is functioning.
- Avoid flooding the engine by repeated pulls on full choke without giving it a chance to fire. If flooded, remove the spark plug, pull the rope to clear out excess fuel, then retry.
2. Autotune / M‑Tronic Module Issues (especially Mark II models)
The 550 XP (especially later models with “AutoTune” or M‑Tronic electronics) has an advanced fuel‑/air‑management system. That means some extra failure points.
What to do:
- Make sure the saw’s dealer has updated the firmware/module settings if required.
- Check compression, if it’s low (e.g., 115 PSI instead of 130+ on this model), the engine will struggle, and the AutoTune system may not compensate.
- Keep connections clean, ensure the carburettor and air intake are free of leaks or blockages, because the electronics‑based system assumes correct mechanical function.
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3. Overheating / Excessive Wear (Pistons, Cylinders, Bearings)
Although this is a heavier‑duty saw, misuse or poor maintenance can lead to serious mechanical problems.
What to do:
- Always use the correct fuel/oil mix (manufacturer‑specified ratio) and avoid letting the engine run under inadequate load or cooling.
- Ensure the cooling fins, air inlet, and muffler are clean and unobstructed.
- Avoid overly long idling or running the saw at high RPM for extended periods without appropriate rest.
- Regularly inspect and clean the muffler, spark arrestor screen, and exhaust path.
4. Chain Tension, Bar/Chain Fitment & Maintenance Problems
While not unique to the 550 XP, some users note issues with chain tensioning and compatibility of bar/chain combinations.
- Poor chain fitment increases load on the engine, reduces performance, and can cause faster wear.
What to do:
- Use the correct bar length and chain gauge recommended by Husqvarna.
- Maintain proper tension, a chain too loose will derail or damage the saw; too tight adds undue strain.
- Keep the chain sharp and properly lubricated, a dull chain causes more wear and heat.
- Inspect sprocket and guide bar regularly for wear, as increased friction can exacerbate other problems.
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5. Fuel / Air Intake / Carburettor Blockage & Leaks
Given the high‑performance nature of the engine, small issues in fuel or air supply can manifest as big problems.
- The manufacturer’s “Common Chainsaw Problems Solved” guide applies to the 550 XP: check fuel filter, hoses, air filter, carburettor settings.
What to do:
- Replace or clean the fuel filter regularly.
- Inspect fuel lines for cracking or leaking (especially older saws).
- Clean or replace the air filter promptly, a clogged air filter reduces performance dramatically.
- Check all gaskets, intake manifold, and muffler base for leaks, air leaks reduce effective compression.
- Ensure the carburettor settings are correct (H‑screw, L‑screw, idle) or, if equipped with AutoTune, that module has been allowed to calibrate under load.
6. Spark Plug and Ignition Issues
A simple but often overlooked cause of performance and starting problems.
- According to the Husqvarna guide, check the spark plug electrode for carbon build‑up, correct the gap, and test for spark.
- In starting problems, users have checked and found spark plug wet (flooded) or fouled, pointing toward other underlying issues.
What to do:
- Remove the plug periodically to inspect the condition and correct gap.
- Replace with the manufacturer’s specified plug at recommended intervals.
- If you find a wet plug and fuel smell, suspect flooding or escape of fuel into the crankcase, clear it out before restarting.
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7. Oil Leakage & Lubrication Issues
Good lubrication is vital for chainsaws; the 550 XP is no exception.
- One of the common problems listed for the 550 XP Mark II is “Oil leakage”.
- Oil leaks can lead to chain bar and chain wear, poor cutting performance, and require more frequent maintenance.
What to do:
- Ensure the chain‑oil reservoir is filled and that the oil delivery (bar nose oiling) is working properly.
- Inspect oil seals, bar mounting area, and oil pump for signs of leakage or damage.
- Clean the saw after use, accumulated sawdust, wood sap, and oil can clog oil ports, causing poor oiling.
8. Fuel Efficiency / High Fuel Consumption
Users frequently note that the 550 XP consumes more fuel than expected, which is partly due to its high output and partly due to maintenance or tuning issues.
What to do:
- Keep the chain sharp, a dull chain causes slower cuts and greater fuel draw.
- Ensure the air filter is clean (restricted air causes fuel wastage).
- Verify the chain is properly tensioned, the bar is straight, and the sprocket is in good condition, all of which affect cutting efficiency.
- Use fuel mix and oil that meet specifications; poor fuel quality will degrade efficiency.
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FAQs
Is the Husqvarna 550 XP a good saw?
Yes, the Husqvarna 550 XP is a professional-grade chainsaw known for its power and durability. It features a 50.1 cc engine with X-Torq technology for efficient fuel use and strong performance. It’s suitable for felling, limbing, and bucking small to medium trees. Proper maintenance and correct use are essential to get the best performance.
What is the most common problem with Husqvarna chainsaws?
The most common issues include:
- AutoTune module problems, causing bogging or unstable idle
- Difficulty starting when cold or hot
- Fuel system issues, such as clogged lines or filters
- Overheating if cooling fins or muffler get blocked
- Chain or bar maintenance problems
How big of a bar can you put on a Husqvarna 550 XP?
The recommended bar length for the 550 XP is 13 to 20 inches. Using a bar longer than 20 inches is not advised, as it can reduce performance and strain the engine.
How to reset Husqvarna AutoTune?
To reset the AutoTune system:
- Idle reset: Start the saw and let it run at idle for about 3 minutes.
- Full-throttle reset: Make a load-bearing cut for 45–60 seconds to allow AutoTune to adjust at high speed.
- Dealer reset: If issues persist, a service technician can perform a full reset or firmware update.
What kind of wood can the 550 XP cut?
The 550 XP can handle both softwoods and hardwoods, including pine, cedar, fir, oak, maple, and beech. It is ideal for small to medium-sized trees and is suitable for felling, limbing, and bucking when properly maintained and tuned.
Final words
The Husqvarna 550 XP is a powerful and well‑regarded chainsaw in professional circles, but it also demands proper maintenance, correct starting procedure, and attention to mechanical and electronic systems. Many of the common problems are not inherent design flaws so much as symptoms of misuse or neglect. Still, the advanced features (like AutoTune) add complexity.
