Stihl FS55R Carburetor Rebuild Kit (5 Pro Tips For Woodcutters)

Imagine your trusty Stihl FS55R, a workhorse in your arsenal, sputtering and stalling just when you need it most. Frustrating, right? It happened to me last fall, right when I was knee-deep in prepping firewood for the winter. The problem? A gunked-up carburetor. Thankfully, a carburetor rebuild kit and a little elbow grease saved the day. This article is your guide to not only rebuilding your Stihl FS55R carburetor but also to understanding the costs involved, giving you pro tips to save money and time.

Stihl FS55R Carburetor Rebuild Kit: 5 Pro Tips for Woodcutters

When your Stihl FS55R starts acting up, a carburetor rebuild kit is often the answer. But before you dive in, let’s break down the process and the associated costs. As someone who’s faced this issue firsthand, I can tell you that knowing the ins and outs of carburetor maintenance can save you a ton of money and keep your equipment running smoothly.

Understanding the Need for a Carburetor Rebuild

The carburetor is the heart of your Stihl FS55R engine, mixing air and fuel for combustion. Over time, especially with ethanol-blended fuels, carburetors can become clogged with deposits, leading to poor performance. Symptoms include:

Difficulty starting
Rough idling
Stalling
Loss of power

Ignoring these symptoms can lead to more significant engine damage, costing you more in the long run. A carburetor rebuild is a cost-effective solution to restore your trimmer’s performance.

Tip #1: Choosing the Right Carburetor Rebuild Kit

Not all rebuild kits are created equal. You’ll find a range of options online and at local hardware stores. Here’s what to consider:

Compatibility: Ensure the kit is specifically designed for your Stihl FS55R model. Double-check the part numbers!
Quality: Opt for reputable brands. Aftermarket kits can be cheaper, but the quality of the gaskets and diaphragms may be inferior. I’ve learned this the hard way, having to redo a rebuild with a better kit after a cheap one failed within weeks.
Completeness: The kit should include all necessary components: gaskets, diaphragms, needle valve, and fuel filter (if applicable).

Cost Breakdown:

Aftermarket Kit: $10 – $20 (USD)
Genuine Stihl Kit: $25 – $40 (USD)

While the genuine Stihl kit is more expensive, the superior quality and reliability often justify the cost. Think of it as an investment in the longevity of your trimmer.

Tip #2: Gathering Your Tools and Supplies

Before you start, gather all the necessary tools and supplies. This will streamline the process and prevent frustrating interruptions.

Screwdrivers: Phillips and flathead (small sizes)
Pliers: Needle-nose pliers are particularly useful.
Carburetor Cleaner: A spray-on cleaner designed for carburetors.
Compressed Air: To blow out passages and ensure they are clear.
Clean Rags: Essential for wiping away dirt and fuel residue.
Small Containers: To keep track of small parts.
Camera or Smartphone: Take photos of each step as you disassemble the carburetor. This will be invaluable when reassembling.
Work Gloves: To protect your hands from fuel and solvents.

Cost Breakdown:

Carburetor Cleaner: $5 – $10 (USD)
Compressed Air (Canned): $8 – $15 (USD)

You likely already have the screwdrivers and pliers. If not, a basic tool set can be purchased for around $20 – $30 (USD).

Tip #3: Disassembly and Cleaning: The Devil is in the Details

This is where attention to detail is crucial. Work in a well-lit area and follow these steps:

Remove the Carburetor: Disconnect the fuel lines and throttle linkage. Carefully remove the carburetor from the engine.
Disassemble the Carburetor: Refer to your Stihl FS55R service manual (or a reliable online tutorial) for specific instructions. Typically, you’ll remove the metering cover, fuel pump cover, and various small parts. This is where those photos come in handy!
Clean the Components: Spray all parts with carburetor cleaner and use compressed air to blow out any passages. Pay close attention to the jets and nozzles. I often use a fine wire (like a guitar string) to gently clear any stubborn blockages.
Inspect the Parts: Check the diaphragms for cracks or tears. Examine the needle valve for wear or damage. Replace any worn or damaged parts with the new components from the rebuild kit.

Pro Tip: When disassembling, lay out the parts in the order you remove them. This makes reassembly much easier.

Tip #4: Reassembly and Adjustment: Precision is Key

Reassembling the carburetor is essentially the reverse of disassembly. Use your photos and the service manual as guides.

Install New Components: Carefully install the new diaphragms, gaskets, and needle valve. Ensure they are seated correctly.
Reassemble the Carburetor: Reattach the fuel pump cover, metering cover, and other components.
Adjust the Carburetor: This is critical for optimal performance. The Stihl FS55R typically has two adjustment screws:
- L (Low Speed): Adjusts the fuel mixture at idle.
- H (High Speed): Adjusts the fuel mixture at high RPM.
- Initial Settings: Refer to your service manual for the factory-recommended settings. As a general rule, start with both screws turned all the way in, then back them out 1 to 1.5 turns.
- Fine-Tune the Adjustment: Start the engine and let it warm up. Adjust the L screw until the engine idles smoothly. Then, adjust the H screw for optimal performance at full throttle. You may need to make small adjustments to both screws to achieve the best results.

Pro Tip: If you’re unsure about carburetor adjustment, take your trimmer to a qualified mechanic. Improper adjustment can damage the engine.

Cost Consideration:

If you choose to have a mechanic rebuild the carburetor, expect to pay around $50 – $100 (USD) for labor, in addition to the cost of the rebuild kit. This might be a worthwhile investment if you’re not comfortable tackling the job yourself.

Tip #5: Preventative Maintenance: An Ounce of Prevention…

Once you’ve rebuilt your carburetor, take steps to prevent future problems.

Use Fresh Fuel: Avoid using old or stale fuel. Ethanol-blended fuels can degrade quickly and cause deposits in the carburetor. I always use fuel stabilizer, especially when storing my trimmer for extended periods.
Drain the Fuel Tank: If you’re not going to use your trimmer for a month or more, drain the fuel tank and run the engine until it stalls. This prevents fuel from sitting in the carburetor and causing deposits.
Clean the Air Filter: A dirty air filter restricts airflow and can cause the engine to run rich, leading to carburetor problems. Clean the air filter regularly.
Use High-Quality Two-Stroke Oil: Use a two-stroke oil specifically designed for air-cooled engines. This will help lubricate the engine and prevent carbon buildup.

Cost Breakdown:

Fuel Stabilizer: $5 – $10 (USD) per bottle
Two-Stroke Oil: $10 – $20 (USD) per quart
Air Filter: $5 – $10 (USD)

These preventative maintenance measures are relatively inexpensive and can significantly extend the life of your carburetor and engine.

Global Perspective on Carburetor Rebuild Costs

The cost of a Stihl FS55R carburetor rebuild kit and labor can vary significantly depending on your location. Here’s a brief overview:

North America: As discussed above, rebuild kits typically range from $10 to $40 (USD), and labor costs for a mechanic can range from $50 to $100 (USD).
Europe: Prices are generally similar to North America, with rebuild kits costing €10 to €40 and labor costs ranging from €50 to €100.
Australia: Due to higher import costs, rebuild kits may be slightly more expensive, ranging from $15 to $50 (AUD). Labor costs are also generally higher, ranging from $70 to $120 (AUD).
Asia: In some Asian countries, rebuild kits may be cheaper due to lower manufacturing costs. However, the quality of these kits may be questionable. Labor costs can also vary significantly depending on the country and the mechanic’s expertise.

Data Point: According to a survey of small engine repair shops in the United States, the average cost of a carburetor rebuild for a Stihl FS55R is $75 (USD), including parts and labor. This figure can vary depending on the region and the shop’s hourly rate.

Unique Insights on Budgeting for Wood Processing

Beyond just the carburetor rebuild, budgeting for wood processing involves a multitude of factors. As someone who’s been cutting and splitting firewood for years, I’ve learned a few tricks to keep costs down.

Wood Source: The cost of wood varies greatly depending on the source. If you’re harvesting your own wood, you’ll need to factor in the cost of permits (if required), fuel for your chainsaw, and the time you spend cutting and hauling. If you’re purchasing firewood, shop around for the best price per cord. Prices can vary significantly depending on the wood species and the seller.
Equipment Costs: Chainsaws, splitters, axes, and other wood processing tools can be a significant expense. Consider buying used equipment to save money. I bought my log splitter used for half the price of a new one, and it works just as well.
Labor Costs: If you’re hiring someone to help you with wood processing, factor in their hourly wage. The average hourly wage for a firewood handler in the United States is around $15 – $20 (USD), but this can vary depending on the location and the person’s experience.
Storage Costs: If you’re storing firewood for an extended period, you may need to factor in the cost of a storage shed or tarp to protect it from the elements.

Case Study:

I recently helped a friend budget for a firewood processing project. He needed to cut and split 5 cords of firewood for the winter. Here’s a breakdown of his estimated costs:

Wood Purchase: $500 (USD) (at $100 per cord)
Chainsaw Fuel and Oil: $50 (USD)
Log Splitter Rental: $100 (USD) (for a weekend rental)
Labor (Friend’s Help): $0 (USD) (he traded favors)
Storage Tarp: $30 (USD)

Total Estimated Cost: $680 (USD)

By carefully budgeting and sourcing materials wisely, he was able to keep his costs under control and have plenty of firewood for the winter.

Cost Optimization Tips for Wood Processing

Here are some practical tips to help you optimize your wood processing costs:

Harvest Wood in the Off-Season: Wood prices are typically lower in the spring and summer when demand is lower.
Buy in Bulk: Purchasing firewood in larger quantities can often save you money per cord.
Season Your Firewood Properly: Properly seasoned firewood burns more efficiently and produces more heat, reducing the amount of wood you need to burn.
Maintain Your Equipment: Regular maintenance will extend the life of your tools and prevent costly repairs.
Sharpen Your Chainsaw: A sharp chainsaw cuts faster and more efficiently, saving you time and fuel.
Consider Alternative Heating Sources: If firewood is too expensive in your area, explore alternative heating sources such as propane, natural gas, or electric heaters.

Data Point: According to the U.S. Energy Information Administration, the average price of residential firewood in the United States is around $250 (USD) per cord. However, this price can vary significantly depending on the region, wood species, and seller.

Technical Explanations and Calculations

Understanding some basic calculations can help you estimate your wood processing needs and costs.

Calculating Volume of Logs: The volume of a log can be estimated using the Doyle Log Rule, which is a common method used in the United States. The formula is:
- (Small End Diameter in Inches - 4)^2 * Length in Feet / 16
This will give you the volume in board feet. * Converting Board Feet to Cords: A cord of wood is a stack of wood that measures 4 feet high, 4 feet wide, and 8 feet long, or 128 cubic feet. To convert board feet to cords, you’ll need to know the average board foot content per log. This can vary depending on the log’s diameter and length. As a rough estimate, 500 board feet is often considered equivalent to one cord. * Estimating Drying Time: The drying time for firewood depends on several factors, including the wood species, the size of the pieces, and the climate. As a general rule, it takes at least 6 months to properly season firewood. However, some species, such as oak, may take a year or more.
- Formula: Drying Time (months) = Wood Density Factor * Moisture Content Factor * Climate Factor
This is a simplified formula, and the actual drying time can vary.

Actionable Takeaways and Next Steps

Rebuilding your Stihl FS55R carburetor is a manageable task with the right tools, knowledge, and a little patience. By following these pro tips, you can save money, extend the life of your equipment, and keep your wood processing projects on track.

Here are your next steps:

Assess Your Trimmer: Determine if a carburetor rebuild is necessary.
Purchase the Right Kit: Choose a high-quality rebuild kit specifically designed for your Stihl FS55R.
Gather Your Tools: Ensure you have all the necessary tools and supplies.
Follow the Disassembly and Reassembly Instructions: Take your time and pay attention to detail.
Adjust the Carburetor Properly: Fine-tune the adjustment for optimal performance.
Implement Preventative Maintenance Measures: Keep your carburetor clean and your engine running smoothly.
Budget Wisely: Plan your wood processing projects carefully to avoid unnecessary expenses.

By taking these steps, you’ll be well on your way to becoming a more efficient and cost-effective woodcutter. Remember, a little maintenance goes a long way! Good luck, and happy cutting!

Stihl FS55R Carburetor Rebuild Kit (5 Pro Tips for Woodcutters)