What is the Spark Plug Gap on a Husqvarna Chainsaw?

what is the spark plug gap on a husqvarna chainsaw

A chainsaw is one of the most useful power tools for handling tree removal, pruning, and cutting firewood. And like any power tool, keeping your chainsaw properly maintained is crucial for optimal performance and safety. One important maintenance task is ensuring the correct spark plug gap on your Husqvarna chainsaw. In this article, I’ll provide an overview of spark plug gaps for Husqvarna chainsaws and walk through the steps for adjusting the gap, replacing the plug, and general chainsaw maintenance.

First, let’s look at why the spark plug gap matters for your chainsaw. The gap between the center and side electrodes of the spark plug is carefully calibrated to produce the strongest spark for igniting the fuel mixture in the combustion chamber. An incorrect gap – either too wide or too narrow – can lead to ignition problems, poor fuel economy, loss of power, and increased emissions. For peak performance, it’s critical to use the manufacturer’s specified gap for your particular Husqvarna model.

Husqvarna is known for making professional-grade outdoor power equipment like chainsaws, leaf blowers, pressure washers, and power cutters. Their chainsaw lineup covers everything from casual homeowner saws to high-performance models for demanding applications. Regardless of the specific Husqvarna chainsaw you own, following the prescribed maintenance schedule and spark plug gap is key for reliability.

So what is the correct spark plug gap on your Husqvarna chainsaw? Let’s take a look at the factory specifications.

Husqvarna Chainsaw Spark Plug Gap Specifications

what is the spark plug gap on a husqvarna chainsaw

The gap setting depends on the exact engine model and displacement. Here are some common sizes:

  • Husqvarna 435 chainsaw: 0.025-inch gap
  • Husqvarna 440e chainsaw: 0.020-inch gap
  • Husqvarna 550XP chainsaw: 0.020-inch gap
  • Husqvarna 560XP chainsaw: 0.020-inch gap

Always check your owner’s manual or consult an authorized Husqvarna dealer to verify the right gap for your specific chainsaw. Even models that share the same engine can have slightly different gap specifications. Precision is important to avoid performance issues.

Types of Spark Plugs for Husqvarna Chainsaws

Husqvarna recommends using only their approved spark plugs designed for each chainsaw model. This ensures optimal ignition timing and performance. Two common plugs are:

  • NGK BPM6A – Used in many 40-50cc Husqvarna saws
  • Husqvarna 5993334012 – OE part for certain saws

Using the manufacturer’s recommended spark plug also makes it easier to select the proper gap size. Aftermarket or “universal” plugs may not have the exact gap required for your saw. Always cross-reference any replacement plugs to match your Husqvarna’s OE part number.

When selecting a new spark plug, check that the gap matches what’s listed in your owner’s manual. Use a wire feeler gauge to measure the electrode gap and adjust as needed using a spark plug gap tool. This extra step helps prevent any power loss or performance issues from an incorrect gap.

How to Adjust the Spark Plug Gap on a Husqvarna Chainsaw

Adjusting the gap on your spark plug is a quick and simple process. Here are the basic steps:

Removing the Engine Cover

First, remove the plastic engine cover to access the spark plug. This usually involves loosening the four mounting screws and lifting the cover up and away from the saw. Refer to your owner’s manual for details on removing covers.

Adjusting the Spark Plug Gap

Once the plug is accessible, use a spark plug gap tool or wire feeler gauge to check the current gap width. Insert the gauge or tool between the center and side electrodes to measure the space.

Slowly adjust the gap by bending the ground electrode carefully until the desired spacing is reached. Be cautious not to apply too much force. Compare your adjustment to the gap listed for your model and continue tweaking as needed.

Recheck the gap with the feeler gauge before reinstalling the plug. Consistent accuracy helps maintain strong ignition performance.

How to Clean or Replace the Spark Plug on a Husqvarna Chainsaw

Over time, spark plugs can become fouled or worn, requiring replacement or cleaning. Here are the basic steps for servicing the plug:

Tools Needed

Gather the following supplies:

  • Protective gloves
  • Spark plug wire brush
  • Appropriate spark plug socket wrench
  • Replacement plug (if needed)

Cleaning and Replacing the Spark Plug

With the engine cover removed, detach the spark plug cap and wire from the plug. Use the socket wrench to unthread the plug from the cylinder.

Inspect the plug contacts and ceramic insulator for excessive fouling or wear. Use the wire brush to gently clean off carbon deposits and debris around the electrodes.

If the erosion or buildup is excessive, replace the plug with a new one gapped to the correct specification. Otherwise, reinstall the cleaned plug, being careful not to over-tighten.

Reattach the plug wire and cap, then reinstall the engine cover. With fresh ignition, your Husqvarna chainsaw will be ready for optimal performance.

Husqvarna Chainsaw Maintenance

Proper maintenance is key to keeping your Husqvarna chainsaw running safely and efficiently for years to come. Here are some important regular and periodic service tasks:

Regular Maintenance Tasks

  • Cleaning the air filter – Prevents engine-damaging debris.
  • Checking/adjusting the chain tension – Reduces wear and enables safe cutting.
  • Inspecting the bar and chain for wear – Ensures safe operation before failures occur.

Periodic Maintenance Tasks

  • Replacing the fuel filter – Allows proper fuel flow to the engine.
  • Checking the starter mechanism – Confirms easy, reliable starting.
  • Inspecting the clutch and sprocket – Averts excessive wear from damaged parts.

Always follow Husqvarna’s maintenance schedule and procedures to maximize the lifespan of your chainsaw. Keep the owner’s manual on hand and consult it whenever performing repairs or service.

Proper spark plug maintenance – checking the gap, changing fouled plugs, using the specified replacement parts – is one of the simplest ways to keep your chainsaw’s engine performing its best. But never neglect the other critical components and service intervals either.

Frequently Asked Questions

What is the standard engine for Husqvarna chainsaws?

Husqvarna uses several different engine models depending on the chainsaw’s displacement and intended usage. Some common engines found across their product line include the XP, X-Torq, and Autotune systems. Check your owner’s manual or consult a Husqvarna dealer for specifics on your chainsaw model.

How often should I replace the spark plug on my Husqvarna chainsaw?

Recommended spark plug replacement intervals vary based on usage and operating conditions. As a general guideline, plan to install a new plug after 100 hours of use. But inspect the plug regularly as part of your maintenance routine and replace sooner if observed wear or fouling issues.

Can I use a different brand of spark plug in my Husqvarna chainsaw?

Yes, provided the replacement plug has the identical specifications, thread size, and correct gap required for your Husqvarna model. Using the manufacturer’s original part is best, but equivalent aftermarket plugs are acceptable if properly gapped. Avoid universal or adjustable gap plugs.

How do I know if my spark plug is faulty?

Difficulty starting, rough idle, lack of power, increased fuel usage, and fouled contacts all can indicate spark plug problems. Inspect the plug after experiencing any of those symptoms to check its condition. Replace if excessive wear or fouling is present.

What are the common causes of spark plug failure?

Fouling from carbon/oil deposits, gap widening through electrode wear, corrosion, and physical damage like cracked insulators are frequent spark plug failure modes. Using the prescribed fuel mix and performing regular maintenance helps maximize plug lifespan.

How do I clean a fouled spark plug?

Gently use a wire brush to remove carbon deposits from the electrodes and insulator tip. Take care not to damage the components while cleaning. Severe fouling may require replacement instead of cleaning for proper operation.

Can I use a spark plug with a different gap size in my Husqvarna chainsaw?

No, always adhere precisely to the specified gap for your particular chainsaw model. Even minor deviations from the recommended spacing can negatively impact ignition performance, fuel efficiency, emissions, and engine life.

In summary, keeping the spark plug properly gapped and serviced is vital for a Husqvarna chainsaw to deliver reliable, trouble-free performance. Refer to your owner’s manual and follow the manufacturer’s maintenance instructions. With proper care, your trusted Husqvarna saw will keep running optimally for years of productive use.

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