Husqvarna 545 Mark II Issues (5 Pro Fixes for Saw Revival)

ByStaff Writer Hours Posted on Categories Basic

It was a crisp autumn morning, the kind that makes you want to be out in the woods with the smell of freshly cut wood hanging in the air. I remember heading out to a job site, eager to put my Husqvarna 545 Mark II to work. I had a good stack of oak logs waiting, ready to be turned into firewood. But as I pulled the starter cord, nothing. Again, nothing. A sinking feeling hit me. This saw was relatively new, and I relied on it heavily. This experience taught me the importance of understanding common issues and knowing how to fix them. Over the years, I’ve learned quite a bit about keeping these saws running smoothly. Let me share my insights and the “5 Pro Fixes” I’ve developed to revive a Husqvarna 545 Mark II that’s giving you trouble.

Husqvarna 545 Mark II Issues (5 Pro Fixes for Saw Revival)

The Husqvarna 545 Mark II is a powerhouse, known for its performance and reliability. However, like any piece of machinery, it can encounter problems. Understanding these potential issues and knowing how to address them is crucial for maximizing its lifespan and efficiency. I’ll walk you through five common problems I’ve seen with this model and the solutions I’ve found most effective.

1. Starting Problems: No Spark, No Start

One of the most frustrating issues is when your saw refuses to start. You pull the cord, again and again, but get nothing. I’ve been there more times than I’d like to admit. This often boils down to ignition problems.

Diagnosing Ignition Issues

  • Spark Plug Check: The first thing I do is remove the spark plug. I look for signs of fouling (carbon buildup) or damage. A wet spark plug indicates fuel is getting through, but there’s no spark. A dry spark plug suggests a fuel delivery problem.
  • Spark Test: With the spark plug removed, I reattach it to the ignition lead. I then hold the spark plug against the engine block and pull the starter cord. You should see a strong, blue spark. If there’s no spark, or a weak, yellow spark, the ignition system is the culprit.

Pro Fix: Ignition System Revival

  • Spark Plug Replacement: If the spark plug is fouled or damaged, replace it with a new one. I recommend using the spark plug specified in your Husqvarna 545 Mark II’s manual. A new spark plug can often solve starting problems.
  • Ignition Coil Inspection: If the spark plug is good, the ignition coil might be faulty. Check the coil for cracks or damage. Use a multimeter to test the coil’s resistance. Compare the reading to the specifications in the saw’s service manual. If the coil is out of spec, replace it. I’ve found that a faulty ignition coil is a common cause of starting problems, especially in older saws.
  • Air Gap Adjustment: The air gap between the ignition coil and the flywheel is critical. If the gap is too wide or too narrow, it can prevent the coil from generating a spark. Use a feeler gauge to set the air gap to the manufacturer’s specification. This is a simple adjustment that can make a big difference.

Tools Needed:

  • Spark plug wrench
  • New spark plug (NGK BPMR7A or equivalent)
  • Screwdriver
  • Multimeter
  • Feeler gauge

Real-World Example:

I had a Husqvarna 545 Mark II that wouldn’t start after sitting idle for a few months. I replaced the spark plug, but still no luck. After testing the ignition coil, I found it was faulty. Replacing the coil solved the problem, and the saw fired right up.

Takeaway:

Starting problems are often related to the ignition system. Start with the spark plug and work your way through the ignition coil and air gap. A systematic approach will help you pinpoint the problem and get your saw running again.

2. Fuel Delivery Issues: Stalling and Poor Performance

If your Husqvarna 545 Mark II starts but stalls shortly after, or if it runs poorly, the problem likely lies within the fuel delivery system.

Diagnosing Fuel Problems

  • Fuel Filter Check: A clogged fuel filter is a common culprit. Remove the fuel filter from inside the fuel tank and inspect it. If it’s dirty or clogged, replace it. A clean fuel filter ensures a steady supply of fuel to the carburetor.
  • Fuel Line Inspection: Check the fuel lines for cracks, leaks, or kinks. Damaged fuel lines can restrict fuel flow and cause stalling or poor performance. Replace any damaged fuel lines.
  • Carburetor Issues: The carburetor mixes fuel and air for combustion. A dirty or improperly adjusted carburetor can cause a variety of problems.

Pro Fix: Fuel System Optimization

  • Fuel Filter Replacement: Replace the fuel filter regularly, especially if you’re using the saw frequently. I recommend replacing it every 3-6 months, depending on usage. A new fuel filter is a cheap and easy way to prevent fuel delivery problems.
  • Fuel Line Replacement: Replace any cracked, leaking, or kinked fuel lines. Use fuel lines specifically designed for chainsaws. Ensure the fuel lines are properly connected and secured.
  • Carburetor Cleaning: If the carburetor is dirty, clean it using carburetor cleaner. Disassemble the carburetor carefully and clean all the jets and passages. Use compressed air to blow out any remaining debris.
  • Carburetor Adjustment: The Husqvarna 545 Mark II’s carburetor has three adjustment screws: Low (L), High (H), and Idle (T). Adjusting these screws can fine-tune the fuel-air mixture.
    • L (Low): Adjusts the fuel mixture at idle and low speeds.
    • H (High): Adjusts the fuel mixture at high speeds.
    • T (Idle): Adjusts the engine’s idle speed.
    • Start by turning both the L and H screws all the way in, then back them out 1 to 1.5 turns. Start the saw and let it warm up. Adjust the L screw until the engine idles smoothly. Then, adjust the T screw until the chain stops moving at idle. Finally, make a test cut and adjust the H screw for optimal performance at high speeds. If you’re not comfortable adjusting the carburetor, take it to a qualified technician. I can’t stress enough how important proper carburetor adjustment is.

Tools Needed:

  • Fuel filter
  • Fuel line
  • Screwdriver
  • Carburetor cleaner
  • Compressed air
  • Carburetor adjustment tool (optional)

Measurements:

  • Fuel filter replacement interval: 3-6 months
  • Carburetor screw adjustment: 1-1.5 turns out from fully in (initial setting)

Real-World Example:

I was cutting firewood with my Husqvarna 545 Mark II, and it started stalling frequently. I checked the fuel filter, and it was completely clogged with debris. Replacing the filter solved the problem, and the saw ran smoothly again.

Takeaway:

Fuel delivery problems can cause stalling and poor performance. Regularly inspect and maintain the fuel filter, fuel lines, and carburetor. Proper carburetor adjustment is crucial for optimal performance.

3. Chain and Bar Issues: Dull Chain, Poor Cutting

A dull chain or a damaged bar can significantly reduce the saw’s cutting performance. It can also be dangerous, as it requires more force to cut, increasing the risk of kickback.

Diagnosing Chain and Bar Problems

  • Chain Sharpness: A sharp chain is essential for efficient cutting. A dull chain will produce fine sawdust instead of chips, and it will require more force to cut.
  • Chain Tension: Proper chain tension is crucial. A chain that’s too loose can derail, while a chain that’s too tight can bind and cause excessive wear.
  • Bar Condition: Inspect the bar for wear, damage, or burrs. A damaged bar can cause the chain to bind or derail.

Pro Fix: Chain and Bar Maintenance

  • Chain Sharpening: Sharpen the chain regularly using a chainsaw file or a chain grinder. Maintain the correct filing angle and depth. A sharp chain makes a world of difference in cutting performance and safety. I usually sharpen my chain after every few tanks of gas, or whenever I notice a decrease in cutting performance.
  • Chain Tension Adjustment: Adjust the chain tension so that it’s snug against the bar but can still be pulled around by hand. There should be about 1/8 inch of slack between the chain and the bar.
  • Bar Maintenance: Clean the bar regularly to remove sawdust and debris. Check the bar rails for wear and burrs. Use a bar dressing tool to remove any burrs and keep the rails smooth. Flip the bar periodically to even out wear.
  • Chain and Bar Oiling: Ensure the chain and bar are properly lubricated. Check the oil level in the oil tank and make sure the oiler is working correctly. A lack of lubrication can cause excessive wear and damage to the chain and bar.

Tools Needed:

  • Chainsaw file or chain grinder
  • Chain tensioning tool
  • Bar dressing tool
  • Chain oil

Measurements:

  • Chain slack: 1/8 inch
  • Chain sharpening frequency: After every few tanks of gas

Real-World Example:

I was cutting some large oak logs, and my Husqvarna 545 Mark II was struggling. I realized the chain was dull. After sharpening the chain, the saw cut through the logs with ease.

Takeaway:

A sharp chain and a well-maintained bar are essential for optimal cutting performance. Sharpen the chain regularly, adjust the chain tension, and maintain the bar. Proper lubrication is also crucial.

4. Air Filter Issues: Loss of Power

A dirty air filter can restrict airflow to the engine, causing a loss of power and potentially damaging the engine.

Diagnosing Air Filter Problems

  • Air Filter Inspection: Remove the air filter and inspect it. If it’s dirty or clogged, it needs to be cleaned or replaced. A dirty air filter can significantly reduce engine performance.

Pro Fix: Air Filter Maintenance

  • Air Filter Cleaning: Clean the air filter regularly using compressed air or warm, soapy water. Allow the filter to dry completely before reinstalling it.
  • Air Filter Replacement: Replace the air filter if it’s damaged or excessively dirty. I recommend replacing the air filter every year, or more frequently if you’re using the saw in dusty conditions.

Tools Needed:

  • Compressed air
  • Warm, soapy water
  • New air filter

Measurements:

  • Air filter replacement interval: Every year, or more frequently in dusty conditions

Real-World Example:

I was using my Husqvarna 545 Mark II to clear some brush, and I noticed it was losing power. I checked the air filter, and it was completely clogged with sawdust. Cleaning the air filter restored the saw’s power.

Takeaway:

A clean air filter is essential for optimal engine performance. Clean or replace the air filter regularly to prevent power loss and engine damage.

5. Overheating Issues: Engine Damage

Overheating can cause serious damage to the engine. It’s important to address overheating issues promptly to prevent costly repairs.

Diagnosing Overheating Problems

  • Cooling Fins: Check the cooling fins on the engine cylinder for dirt and debris. Clean the cooling fins regularly to ensure proper airflow.
  • Fuel Mixture: A lean fuel mixture (too much air, not enough fuel) can cause the engine to overheat. Adjust the carburetor to richen the fuel mixture.
  • Air Filter: A dirty air filter can also contribute to overheating. Make sure the air filter is clean.

Pro Fix: Preventing Overheating

  • Cooling Fin Cleaning: Clean the cooling fins regularly using compressed air or a brush.
  • Carburetor Adjustment: Adjust the carburetor to ensure a proper fuel mixture. If the engine is running lean, richen the fuel mixture by turning the H screw out slightly.
  • Air Filter Maintenance: Keep the air filter clean to ensure proper airflow.
  • Proper Fuel Mixture: Always use the correct fuel-oil mixture as specified in the saw’s manual. A lean fuel mixture can cause overheating. I always use a high-quality synthetic 2-stroke oil mixed at a ratio of 50:1.

Tools Needed:

  • Compressed air
  • Brush
  • Screwdriver
  • Fuel-oil mixing container

Measurements:

  • Fuel-oil mixture ratio: 50:1

Real-World Example:

I was cutting firewood on a hot summer day, and my Husqvarna 545 Mark II started to overheat. I realized the cooling fins were clogged with sawdust. After cleaning the cooling fins, the saw ran cooler.

Takeaway:

Overheating can cause serious engine damage. Keep the cooling fins clean, ensure a proper fuel mixture, and maintain the air filter to prevent overheating.

Additional Tips for Husqvarna 545 Mark II Maintenance

Beyond these five pro fixes, here are some additional tips to keep your Husqvarna 545 Mark II running smoothly:

  • Use Fresh Fuel: Use fresh, high-quality fuel. Old fuel can degrade and cause problems. I always use fuel stabilizer to prevent fuel from going bad.
  • Store the Saw Properly: Store the saw in a dry place. Drain the fuel tank before storing the saw for extended periods.
  • Regular Inspections: Inspect the saw regularly for any signs of damage or wear. Address any problems promptly.
  • Follow the Manual: Always follow the manufacturer’s recommendations for maintenance and operation. The owner’s manual is your best friend.

Safety First

Working with chainsaws can be dangerous. Always wear appropriate safety gear, including:

  • Safety glasses
  • Hearing protection
  • Gloves
  • Chainsaw chaps
  • Steel-toed boots

Be aware of your surroundings and follow all safety precautions.

Conclusion: A Reliable Saw with Proper Care

The Husqvarna 545 Mark II is a reliable and powerful chainsaw that can handle a wide range of tasks. By understanding common issues and implementing these pro fixes, you can keep your saw running smoothly for years to come. Remember to prioritize safety and follow the manufacturer’s recommendations for maintenance and operation. Don’t be afraid to get your hands dirty and learn about your saw. With a little knowledge and effort, you can keep your Husqvarna 545 Mark II in top condition and enjoy its performance for years to come. I hope these tips help you revive your saw and get back to work!

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jessica.wilson@reportertales.store'

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