FS 90 R Stihl Trimmer Review (Pro Insights & Performance Pics)

Did you know that the humble weed whacker, a tool often relegated to the edges of our lawns, can actually tell a compelling story of engineering, power, and even a little bit of personal triumph? I’m not talking about the flimsy electric models here. I’m talking about the Stihl FS 90 R, a machine that I’ve come to know intimately over years of battling everything from stubborn crabgrass to overgrown blackberry bushes.

Stihl FS 90 R: A Pro’s Perspective

The Stihl FS 90 R is more than just a trimmer; it’s a workhorse. I’ve used it for everything from basic yard maintenance to clearing brush for fence lines. Over the years, I’ve developed a real appreciation for its power, reliability, and overall design.

First Impressions and Unboxing

When I first unboxed my FS 90 R, I was immediately struck by its build quality. The plastics felt durable, the metal components were solid, and the overall construction exuded a sense of robustness that you don’t always find in these types of tools. It’s a tool that feels like it’s built to last.

Technical Specifications: The Nitty-Gritty

Let’s get down to the details. The FS 90 R boasts a 28.4 cc engine, delivering ample power for a variety of tasks. It weighs in at around 12.3 pounds, which is a bit heavier than some other trimmers on the market, but the weight is well-balanced, making it comfortable to use for extended periods.

• Engine Displacement: 28.4 cc
• Weight: 12.3 lbs (without cutting attachment and fuel)
• Fuel Capacity: 17.9 oz
• Cutting Swath: 16.5 inches
• Engine Power: 0.95 kW (1.3 bhp)

Starting and Operation: Getting Down to Business

Starting the FS 90 R is generally straightforward. It features Stihl’s Easy2Start system, which reduces the amount of force needed to pull the starter cord. In my experience, it usually starts within a few pulls, even after sitting idle for a while. The choke lever is easily accessible, and the throttle response is smooth and predictable.

Ergonomics and Comfort: A User-Friendly Design

One of the things I appreciate most about the FS 90 R is its ergonomic design. The loop handle is comfortable to grip, and the controls are intuitively placed. The anti-vibration system does a decent job of reducing fatigue, even during long trimming sessions. I’ve spent hours using this trimmer without experiencing significant discomfort.

Performance in the Field: Real-World Testing

The real test of any tool is how it performs in the field. I’ve put the FS 90 R through its paces in a variety of conditions, and I’ve been consistently impressed with its performance.

Weed Trimming: Taming the Lawn

As a weed trimmer, the FS 90 R excels. Its powerful engine easily slices through grass and weeds, leaving a clean, even cut. The adjustable cutting swath allows you to customize the trimmer to your specific needs, whether you’re edging along sidewalks or clearing large areas of overgrown vegetation.

Brush Cutting: Taking on the Tough Stuff

Where the FS 90 R really shines is in its ability to handle brush. I’ve used it to clear everything from small saplings to thick blackberry bushes, and it’s never let me down. With the right cutting attachment (I personally recommend a brush knife), it can make short work of even the most challenging vegetation.

Edging: Precision and Control

The FS 90 R is also a capable edger. Its lightweight design and precise throttle control make it easy to create clean, crisp edges along sidewalks and driveways. I’ve found that using a metal edging blade provides the best results, but the standard trimmer head works well too.

Specific Cutting Attachments and Their Uses

Over the years, I’ve experimented with different cutting attachments for my FS 90 R, and I’ve found that each one has its own unique strengths. Here’s a rundown of some of my favorites:

• AutoCut 25-2: This is the standard trimmer head that comes with the FS 90 R. It’s a good all-around choice for grass and weeds, and it’s easy to reload with new line.
• Brush Knife: This is my go-to attachment for clearing brush. It’s incredibly effective at cutting through thick vegetation, and it’s much more durable than trimmer line.
• PolyCut 27-3: This head uses polymer blades instead of trimmer line. It’s great for cutting through tough weeds and small saplings, and the blades are easy to replace.
• Metal Edging Blade: As I mentioned earlier, this blade is perfect for creating clean, crisp edges along sidewalks and driveways.

Case Study: Clearing a Fence Line

I recently used my FS 90 R to clear a fence line that had become overgrown with blackberry bushes and small trees. The area was about 100 feet long and 10 feet wide, and it was completely impassable. I started by using the brush knife to cut down the larger vegetation, and then I switched to the AutoCut 25-2 to clean up the smaller weeds and grass. The FS 90 R handled the job with ease, and I was able to clear the entire fence line in just a few hours.

• Area Cleared: 100 ft x 10 ft fence line
• Vegetation: Blackberry bushes, small trees, weeds, grass
• Attachments Used: Brush knife, AutoCut 25-2
• Time to Complete: 3 hours

Maintenance and Care: Keeping Your Trimmer Running Smoothly

Like any piece of machinery, the FS 90 R requires regular maintenance to keep it running smoothly. I’ve learned a few things over the years about how to properly care for this trimmer, and I’m happy to share my tips with you.

Fuel and Oil: The Lifeblood of Your Engine

Using the right fuel and oil is crucial for the longevity of your engine. Stihl recommends using a high-quality 2-stroke oil mixed with unleaded gasoline. I personally use Stihl Ultra HP 2-Stroke Engine Oil, and I mix it at a ratio of 50:1.

• Fuel: Unleaded gasoline
• Oil: Stihl Ultra HP 2-Stroke Engine Oil
• Mixing Ratio: 50:1

Air Filter: Keeping the Engine Breathing

The air filter is responsible for keeping dirt and debris out of the engine. A dirty air filter can restrict airflow, which can lead to poor performance and engine damage. I recommend cleaning the air filter every 25 hours of use, or more often if you’re working in dusty conditions.

• Cleaning Frequency: Every 25 hours of use
• Cleaning Method: Wash with soap and water, allow to dry completely

Spark Plug: Igniting the Power

The spark plug is responsible for igniting the fuel-air mixture in the engine. A worn or fouled spark plug can cause starting problems and poor performance. I recommend replacing the spark plug every 100 hours of use.

• Replacement Frequency: Every 100 hours of use
• Spark Plug Type: NGK BPMR7A

Trimmer Head: Keeping the Line Flowing

The trimmer head is the part of the trimmer that holds the cutting line. Over time, the trimmer head can become worn or damaged, which can lead to problems with line feeding and cutting performance. I recommend inspecting the trimmer head regularly and replacing it if necessary.

• Inspection Frequency: Regularly
• Replacement: When worn or damaged

Sharpening Blades: Maintaining Cutting Efficiency

If you’re using a brush knife or other type of blade attachment, it’s important to keep the blades sharp. Dull blades can be difficult to cut with, and they can also put unnecessary strain on the engine. I recommend sharpening the blades every few hours of use, or more often if you’re cutting through tough vegetation.

• Sharpening Frequency: Every few hours of use
• Sharpening Method: Use a file or grinder to sharpen the blades to a sharp edge

Storage: Protecting Your Investment

When you’re not using your FS 90 R, it’s important to store it properly to protect it from damage. I recommend storing it in a dry, well-ventilated area, away from direct sunlight and extreme temperatures. I also recommend draining the fuel tank before storing it for extended periods of time.

• Storage Location: Dry, well-ventilated area
• Fuel Tank: Drain before storing for extended periods

Common Problems and Solutions: Troubleshooting Tips

Even with proper maintenance, problems can sometimes arise. Here are a few common issues I’ve encountered with my FS 90 R, along with my solutions:

• Problem: The trimmer won’t start.
  • Possible Causes: Empty fuel tank, clogged air filter, fouled spark plug
  • Solutions: Fill the fuel tank, clean or replace the air filter, replace the spark plug
• Problem: The trimmer is running poorly.
  • Possible Causes: Dirty air filter, fouled spark plug, incorrect fuel mixture
  • Solutions: Clean or replace the air filter, replace the spark plug, use the correct fuel mixture
• Problem: The trimmer line won’t feed properly.
  • Possible Causes: Worn trimmer head, incorrect line size, tangled line
  • Solutions: Replace the trimmer head, use the correct line size, untangle the line

Safety First: Protecting Yourself and Others

Operating any type of power equipment can be dangerous if proper safety precautions are not followed. Here are a few safety tips to keep in mind when using the FS 90 R:

Personal Protective Equipment (PPE): Gearing Up for Safety

Always wear appropriate PPE when operating the FS 90 R. This includes:

• Eye Protection: Safety glasses or a face shield
• Hearing Protection: Earplugs or earmuffs
• Gloves: Work gloves
• Long Pants: To protect your legs from flying debris
• Closed-Toe Shoes: Preferably work boots

Safe Operating Practices: Avoiding Accidents

• Read the Owner’s Manual: Familiarize yourself with the trimmer’s operation and safety features.
• Clear the Area: Remove any obstacles or debris from the area you’ll be working in.
• Keep a Safe Distance: Maintain a safe distance from other people and animals.
• Never Operate Under the Influence: Do not operate the trimmer if you are under the influence of drugs or alcohol.
• Take Breaks: Avoid fatigue by taking regular breaks.

Emergency Procedures: Being Prepared

In the event of an accident, it’s important to be prepared. Here are a few emergency procedures to keep in mind:

• Stop the Trimmer: Immediately stop the trimmer if an accident occurs.
• Assess the Situation: Determine the extent of any injuries.
• Call for Help: If necessary, call for medical assistance.
• Administer First Aid: If you are trained in first aid, administer appropriate care.

Alternatives to the Stihl FS 90 R: Exploring Other Options

While I’m a big fan of the FS 90 R, it’s not the only trimmer on the market. Here are a few alternatives to consider:

Stihl FS 91 R: A Step Up in Power

The Stihl FS 91 R is a similar trimmer to the FS 90 R, but it features a slightly more powerful engine. If you’re looking for a bit more oomph, the FS 91 R might be a good choice.

• Engine Displacement: 28.4 cc
• Weight: 12.8 lbs (without cutting attachment and fuel)
• Engine Power: Slightly more powerful than the FS 90 R

Husqvarna 525LS: A Lightweight Option

The Husqvarna 525LS is a lightweight trimmer that’s easy to maneuver. It’s a good choice for homeowners with smaller yards or those who prefer a lighter trimmer.

• Engine Displacement: 25.4 cc
• Weight: 11.5 lbs (without cutting attachment and fuel)
• Engine Power: Less powerful than the FS 90 R

Echo SRM-225: A Budget-Friendly Choice

The Echo SRM-225 is a budget-friendly trimmer that offers good value for the money. It’s a good choice for homeowners who don’t need a lot of power or features.

• Engine Displacement: 21.2 cc
• Weight: 11.0 lbs (without cutting attachment and fuel)
• Engine Power: Less powerful than the FS 90 R

Comparison Table: Weighing the Options

Here’s a comparison table to help you weigh the options:

The Verdict: Is the FS 90 R Right for You?

After years of using the Stihl FS 90 R, I can confidently say that it’s a top-notch trimmer that’s well worth the investment. It’s powerful, reliable, and comfortable to use, and it can handle a wide range of tasks. If you’re looking for a trimmer that will last for years and provide excellent performance, the FS 90 R is an excellent choice.

Pros and Cons: A Balanced Perspective

Here’s a summary of the pros and cons of the Stihl FS 90 R:

Pros:

• Powerful engine
• Durable construction
• Ergonomic design
• Versatile cutting attachments
• Easy to start

Cons:

• Slightly heavier than some other trimmers
• Can be a bit pricey

Who Should Buy This Trimmer?

The Stihl FS 90 R is a good choice for:

• Homeowners with medium to large yards
• Landscapers
• Anyone who needs a powerful and reliable trimmer for a variety of tasks

Final Thoughts: A Trusted Tool

The Stihl FS 90 R has become an indispensable tool in my arsenal. It’s a machine that I can rely on to get the job done, no matter how tough the conditions. If you’re looking for a trimmer that will provide years of reliable service, I highly recommend the FS 90 R. It’s a tool that I’m proud to own.

Next Steps

If you’re considering purchasing a Stihl FS 90 R, I recommend visiting your local Stihl dealer to try it out for yourself. They can answer any questions you have and help you choose the right cutting attachments for your needs. Also, consider watching some online videos to see the FS 90 R in action. This can help you get a better sense of its capabilities and features.

Remember to always prioritize safety when operating any power equipment. Wear appropriate PPE, follow safe operating practices, and be prepared for emergencies. With proper care and maintenance, your Stihl FS 90 R will provide years of reliable service.

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