Craftsman 42cc Chainsaw No Spark Fix (5 Pro Tips You Need)

Flooring is an art. It’s the canvas upon which we build our lives, and just like any masterpiece, it starts with a solid foundation. For many of us, that foundation literally comes from the woods, whether it’s the raw timber for building structures or the firewood that keeps us warm in winter. But before that wood can become a home or a source of heat, it needs to be processed. And often, that processing relies on the trusty chainsaw.

Now, if you’re anything like me, you’ve experienced the frustration of a chainsaw that just won’t start. You pull the cord until your arm feels like it’s going to fall off, only to be met with silence. The culprit? Often, it’s a lack of spark. And when that happens with your Craftsman 42cc chainsaw, it’s time to troubleshoot. But before you start tearing things apart, let’s talk about the costs involved in keeping that saw running and the potential expenses if you need to call in a professional.

Craftsman 42cc Chainsaw No Spark Fix: 5 Pro Tips (and the Costs You Need to Know)

A chainsaw that refuses to spark can throw a wrench into your entire wood processing operation, whether you’re a seasoned logger or a weekend warrior cutting firewood. Understanding the potential causes and how to fix them is crucial, but equally important is understanding the costs associated with those fixes. I’ve spent years felling trees, bucking logs, and splitting firewood, and I’ve learned a thing or two about keeping my chainsaws running smoothly – and affordably.

1. Spark Plug Inspection and Replacement: The Foundation of a Healthy Engine

The spark plug is the heart of the ignition system. It’s a tiny component, but it plays a vital role in igniting the fuel-air mixture in the cylinder. When it fails, you’re left with a chainsaw that’s as useful as a paperweight.

The Problem: A fouled, cracked, or improperly gapped spark plug can prevent the creation of a spark.
The Fix:
- Inspection: Remove the spark plug and visually inspect it. Look for cracks in the porcelain, excessive carbon buildup, or a wet, oily appearance.
- Cleaning: If the plug is just fouled with carbon, you can try cleaning it with a wire brush or spark plug cleaner. However, this is often a temporary fix.
- Gapping: Use a spark plug gapping tool to ensure the gap between the electrode and the ground strap is within the manufacturer’s specifications (usually around 0.025-0.030 inches).
- Replacement: If the plug is damaged or cleaning and gapping doesn’t solve the problem, replace it.
The Costs:
- Spark Plug: A new spark plug for a Craftsman 42cc chainsaw typically costs between \$5 and \$15. Brands like NGK and Champion are generally reliable.
- Spark Plug Cleaner: A can of spark plug cleaner costs around \$5-\$10.
- Spark Plug Gapping Tool: A basic gapping tool costs around \$3-\$7.
- Labor (If Hiring a Professional): If you’re not comfortable replacing the spark plug yourself, a small engine repair shop might charge \$20-\$40 for the service, including the cost of the plug.
My Experience: I remember one particularly cold winter day when my chainsaw refused to start. I spent a frustrating hour pulling the cord, convinced the problem was something major. Turns out, the spark plug was simply fouled with oil. A quick cleaning and gapping, and the saw fired right up. Lesson learned: always start with the basics!
Data and Benchmarks: According to industry data from small engine repair shops, spark plug issues account for approximately 30% of chainsaw starting problems. Replacing a spark plug is one of the most common and cost-effective chainsaw repairs.

2. Ignition Coil Testing and Replacement: When the Spark Struggles to Reach

The ignition coil is responsible for generating the high-voltage spark that jumps across the spark plug gap. If the coil is faulty, it won’t produce enough voltage, and your chainsaw won’t start.

The Problem: A cracked, corroded, or internally damaged ignition coil can fail to deliver the necessary voltage to the spark plug.
The Fix:
- Testing: Use a multimeter to test the ignition coil’s primary and secondary resistance. Consult your chainsaw’s service manual for the correct resistance values. A spark tester can also be used to visually confirm if the coil is producing a spark.
- Replacement: If the coil fails the resistance test or doesn’t produce a spark, it needs to be replaced.
The Costs:
- Ignition Coil: A new ignition coil for a Craftsman 42cc chainsaw typically costs between \$20 and \$50. Aftermarket coils are often cheaper than OEM (Original Equipment Manufacturer) coils, but OEM coils are generally more reliable.
- Multimeter: A basic multimeter costs between \$20 and \$50.
- Spark Tester: A spark tester costs between \$10 and \$20.
- Labor (If Hiring a Professional): Replacing an ignition coil can be a bit more involved than replacing a spark plug. A small engine repair shop might charge \$50-\$100 for the service, including the cost of the coil.
My Experience: I once had a chainsaw that would start and run for a few minutes, then die. I replaced the spark plug, cleaned the carburetor, and checked the fuel lines, but nothing seemed to work. Finally, I tested the ignition coil and found that it was failing intermittently. Replacing the coil solved the problem.
Data and Benchmarks: Ignition coil failures account for approximately 20% of chainsaw starting problems. The lifespan of an ignition coil can vary depending on usage and environmental conditions.

3. Kill Switch Inspection: A Simple Switch with a Big Impact

The kill switch is a simple on/off switch that grounds the ignition system, preventing the engine from starting. If the switch is faulty or the wiring is damaged, it can prevent the chainsaw from starting even if the ignition system is otherwise working properly.

The Problem: A corroded, damaged, or stuck kill switch can prevent the ignition system from firing.
The Fix:
- Inspection: Visually inspect the kill switch and its wiring for any signs of damage or corrosion.
- Testing: Use a multimeter to test the kill switch for continuity. When the switch is in the “on” position, there should be no continuity between the switch terminals. When the switch is in the “off” position, there should be continuity.
- Cleaning: Clean the switch contacts with electrical contact cleaner.
- Replacement: If the switch is faulty or the wiring is damaged, replace it.
The Costs:
- Kill Switch: A new kill switch for a Craftsman 42cc chainsaw typically costs between \$5 and \$15.
- Electrical Contact Cleaner: A can of electrical contact cleaner costs around \$5-\$10.
- Labor (If Hiring a Professional): Replacing a kill switch is a relatively simple repair. A small engine repair shop might charge \$20-\$40 for the service, including the cost of the switch.
My Experience: I once spent hours troubleshooting a chainsaw that wouldn’t start, only to discover that the kill switch wire had come loose. A simple reconnection, and the saw fired right up. It was a humbling reminder that sometimes the simplest solutions are the easiest to overlook.
Data and Benchmarks: Kill switch problems account for approximately 10% of chainsaw starting problems. Regularly inspecting and cleaning the kill switch can prevent future issues.

4. Flywheel Key Inspection: Timing is Everything

The flywheel key is a small metal piece that connects the flywheel to the crankshaft. It ensures that the ignition system is properly timed. If the key is sheared or damaged, the timing will be off, and the chainsaw won’t start.

The Problem: A sheared or damaged flywheel key can disrupt the timing of the ignition system. This is most commonly caused by hitting a solid object during operation, such as a rock or nail embedded in the wood.
The Fix:
- Inspection: Remove the flywheel cover and inspect the flywheel key. Look for any signs of damage or shearing.
- Replacement: If the key is damaged, it needs to be replaced.
The Costs:
- Flywheel Key: A new flywheel key for a Craftsman 42cc chainsaw typically costs between \$3 and \$7.
- Flywheel Puller: A flywheel puller may be required to remove the flywheel. These can cost between \$15 and \$30.
- Labor (If Hiring a Professional): Replacing a flywheel key can be a bit more involved than replacing a spark plug. A small engine repair shop might charge \$40-\$80 for the service, including the cost of the key.
My Experience: I was once cutting firewood when I hit a nail that was hidden inside a log. The impact sheared the flywheel key, and the chainsaw immediately shut off. I had to replace the key before I could continue cutting. This experience taught me the importance of inspecting logs carefully before cutting them.
Data and Benchmarks: Flywheel key problems account for approximately 5% of chainsaw starting problems. Always inspect logs carefully before cutting them to avoid hitting hidden objects.

5. Wiring Harness Inspection: The Nervous System of Your Chainsaw

The wiring harness connects all the electrical components of the chainsaw. If the wiring is damaged or corroded, it can prevent the ignition system from working properly.

The Problem: Damaged, corroded, or loose wiring can disrupt the flow of electricity to the ignition system.
The Fix:
- Inspection: Visually inspect the wiring harness for any signs of damage or corrosion.
- Testing: Use a multimeter to test the continuity of the wires.
- Cleaning: Clean any corroded connections with electrical contact cleaner.
- Repair or Replacement: Repair any damaged wires or replace the entire wiring harness if necessary.
The Costs:
- Electrical Contact Cleaner: A can of electrical contact cleaner costs around \$5-\$10.
- Wiring Harness: A new wiring harness for a Craftsman 42cc chainsaw typically costs between \$15 and \$30.
- Wire Connectors and Terminals: A variety pack of wire connectors and terminals costs around \$10-\$20.
- Labor (If Hiring a Professional): Repairing or replacing a wiring harness can be time-consuming. A small engine repair shop might charge \$60-\$120 for the service, including the cost of the parts.
My Experience: I once had a chainsaw that would intermittently lose power. I checked everything I could think of, but I couldn’t find the problem. Finally, I inspected the wiring harness and found a corroded connection. Cleaning the connection solved the problem.
Data and Benchmarks: Wiring harness problems account for approximately 15% of chainsaw starting problems. Regularly inspecting and cleaning the wiring harness can prevent future issues.

Beyond the Spark: Other Potential Cost Considerations

While these five tips focus on the ignition system, it’s important to remember that other factors can also contribute to a chainsaw that won’t start. These factors also have associated costs that you need to factor into your budget.

Fuel System Issues

A clogged fuel filter, a dirty carburetor, or a faulty fuel pump can prevent fuel from reaching the engine. Carburetor rebuild kits typically cost between \$15 and \$30, while a new carburetor can cost between \$30 and \$70. Fuel filters are relatively inexpensive, costing between \$3 and \$7. Cleaning a carburetor yourself can save you money on labor costs, but it requires some mechanical knowledge and the proper tools.

Compression Issues

Low compression can prevent the engine from starting. Compression issues can be caused by worn piston rings, a damaged cylinder, or a leaky head gasket. Repairing compression issues can be expensive, often requiring a complete engine rebuild or replacement. A compression tester costs between \$20 and \$40, allowing you to diagnose the problem yourself.

Chainsaw Maintenance: A Stitch in Time Saves Nine (and a Lot of Money)

Preventative maintenance is key to keeping your chainsaw running smoothly and avoiding costly repairs. Regular maintenance tasks include:

Sharpening the Chain: A dull chain puts extra strain on the engine and can lead to premature wear. Sharpening the chain regularly can save you money on fuel and repairs. A chainsaw sharpening kit costs between \$20 and \$50, or you can pay a professional to sharpen your chain for around \$10-\$20 per sharpening.
Cleaning the Air Filter: A dirty air filter restricts airflow to the engine, reducing performance and potentially causing damage. Cleaning the air filter regularly can help to extend the life of your engine. Air filters typically cost between \$5 and \$15.
Lubricating the Chain: Proper chain lubrication is essential for preventing wear and tear on the chain and bar. Use a high-quality bar and chain oil. A gallon of bar and chain oil costs around \$15-\$25.
Inspecting the Bar: Check the bar for wear and damage. Replace the bar if it is worn or damaged. Chainsaw bars typically cost between \$20 and \$50.
Storing the Chainsaw Properly: Store the chainsaw in a dry, clean place. Drain the fuel tank before storing the chainsaw for extended periods.

The Cost of Calling in a Professional: When DIY Isn’t the Answer

Sometimes, despite your best efforts, you just can’t fix the problem yourself. In those cases, it’s time to call in a professional. But be prepared for the costs.

Diagnostic Fee: Most small engine repair shops charge a diagnostic fee to determine the cause of the problem. This fee typically ranges from \$30 to \$70.
Labor Rate: Small engine repair shops typically charge an hourly labor rate of \$60 to \$100.
Parts Costs: You’ll also have to pay for any parts that need to be replaced.

Before you authorize any repairs, be sure to get a written estimate that includes the diagnostic fee, labor rate, and parts costs. Don’t be afraid to shop around for the best price.

Budgeting for Chainsaw Maintenance and Repairs: A Proactive Approach

Creating a budget for chainsaw maintenance and repairs can help you avoid unexpected expenses. Here are some tips for budgeting:

Estimate Annual Maintenance Costs: Based on your usage, estimate how much you’ll spend on maintenance items like spark plugs, air filters, bar and chain oil, and chain sharpening.
Set Aside a Repair Fund: Set aside a small amount of money each month to cover potential repair costs.
Track Your Expenses: Keep track of your chainsaw maintenance and repair expenses. This will help you to refine your budget over time.
Consider a Service Contract: Some small engine repair shops offer service contracts that cover routine maintenance and repairs. These contracts can be a good option if you want to avoid unexpected expenses.
Factor in Downtime: Don’t forget to factor in the cost of downtime when your chainsaw is out of service. This cost can include lost income, delays in your projects, and the cost of renting a replacement chainsaw.

Case Study: My Firewood Operation Budget

To illustrate how to budget for chainsaw maintenance and repairs, let’s take a look at a case study of my firewood operation. I cut and sell approximately 20 cords of firewood each year. Here’s a breakdown of my estimated annual chainsaw maintenance and repair costs:

Spark Plugs: \$10
Air Filters: \$10
Bar and Chain Oil: \$50
Chain Sharpening: \$40 (I sharpen my own chains)
Potential Repairs: \$100 (I set aside \$100 each year to cover potential repairs)

Total Estimated Annual Chainsaw Maintenance and Repair Costs: \$210

This budget allows me to keep my chainsaw running smoothly and avoid unexpected expenses.

Timber Prices, Equipment Rental Fees, and Fuelwood Market Rates: A Global Perspective

The cost of wood processing and firewood preparation is influenced by a variety of factors, including timber prices, equipment rental fees, and fuelwood market rates. These factors can vary significantly depending on your location and the type of wood you’re processing.

Timber Prices

Timber prices are affected by a variety of factors, including supply and demand, species, quality, and location. According to the U.S. Forest Service, the average stumpage price (the price paid for standing timber) in the United States in 2023 was \$35 per thousand board feet (MBF). However, prices can range from \$10 per MBF for low-quality timber to \$100 per MBF or more for high-quality timber.

In Europe, timber prices are generally higher than in the United States. According to the European Forest Institute, the average price of standing timber in Europe in 2023 was €50 per cubic meter, which is equivalent to approximately \$60 per MBF.

In developing countries, timber prices can be significantly lower than in developed countries. However, it’s important to be aware of the potential environmental and social impacts of purchasing timber from developing countries.

Equipment Rental Fees

If you don’t own a chainsaw, you can rent one from a local rental store. Chainsaw rental fees typically range from \$30 to \$50 per day. You can also rent other wood processing equipment, such as log splitters and wood chippers. Log splitter rental fees typically range from \$50 to \$100 per day, while wood chipper rental fees typically range from \$100 to \$200 per day.

Fuelwood Market Rates

Fuelwood market rates vary depending on your location, the type of wood, and the quantity you’re purchasing. According to the U.S. Energy Information Administration, the average price of firewood in the United States in 2023 was \$250 per cord. However, prices can range from \$150 per cord in rural areas to \$400 per cord or more in urban areas.

In Europe, fuelwood prices are generally higher than in the United States. According to the European Commission, the average price of firewood in Europe in 2023 was €300 per cubic meter, which is equivalent to approximately \$360 per cord.

Cost Optimization and Budget Management: Tips for Saving Money

Here are some practical tips for cost optimization and budget management in wood processing and firewood preparation projects:

Buy Timber or Firewood in Bulk: Buying timber or firewood in bulk can often save you money.
Harvest Your Own Timber: If you have access to a woodlot, you can harvest your own timber. This can save you money on timber costs, but it requires some knowledge of forestry and logging.
Rent Equipment Instead of Buying: If you only need to use a piece of equipment occasionally, it may be more cost-effective to rent it instead of buying it.
Maintain Your Equipment Properly: Proper equipment maintenance can help to extend the life of your equipment and avoid costly repairs.
Sharpen Your Own Chainsaw Chains: Sharpening your own chainsaw chains can save you money on sharpening costs.
Dry Your Firewood Properly: Drying your firewood properly can improve its burning efficiency and reduce the amount of wood you need to burn.
Shop Around for the Best Prices: Don’t be afraid to shop around for the best prices on timber, equipment, and services.
Consider Using Alternative Fuels: If firewood prices are high, consider using alternative fuels such as wood pellets or biofuel.

Calculating Volume of Logs and Estimating Drying Time: Technical Details

Here are some technical details on calculating the volume of logs and estimating drying time:

Calculating Volume of Logs

The volume of a log can be calculated using a variety of formulas. One common formula is the Doyle Log Rule:

Volume (board feet) = (Diameter (inches) – 4)^2 * Length (feet) / 16

Another common formula is the Scribner Log Rule:

Volume (board feet) = (0.79 * Diameter (inches)^2 – 2 * Diameter (inches)) * Length (feet) / 144

These formulas provide an estimate of the volume of lumber that can be sawn from a log. The actual volume of lumber may be less due to waste from sawing and defects in the log.

Estimating Drying Time

The drying time for firewood depends on a variety of factors, including the species of wood, the size of the pieces, the moisture content of the wood, and the weather conditions. As a general rule, hardwoods take longer to dry than softwoods.

Here’s a formula for estimating the drying time for firewood:

Drying Time (months) = Moisture Content (%) / 5

This formula assumes that the firewood is properly stacked and exposed to good airflow. In humid climates, the drying time may be longer.

Actionable Takeaways and Next Steps

So, your Craftsman 42cc chainsaw won’t spark? Don’t despair! Here are some actionable takeaways and next steps:

Start with the Basics: Check the spark plug first. By taking the time to properly maintain your chainsaw, you can save yourself a lot of money and frustration in the long run. So, keep your chain sharp, your air filter clean, and your spark plug fresh, and your chainsaw will be ready to tackle any wood processing project you throw its way. And remember, flooring is an art, and a reliable chainsaw is one of the brushes we use to create it.