Top Common Stihl FS 45 Problems And Their Solutions

When it comes to trimming duties around the garden, the STIHL FS 45 Petrol Line Trimmer is a fantastic option. The FS 45 is portable, strong, and light and was made with ease of use in mind.

Despite the positive user reviews for Stihl fs 45, this tool will disappoint you due to bogging down, carburetor problem, primer problem, spark arrestor screen problem, and whipper snipper not revving.

I’ll discuss each of these Stihl FS 45 problems in detail and provide fixes in this article.

Features & Specifications of Stihl FS 45:

• Power source: petrol
• Weight: 4.1 kg
• Length no cutting tool (cm): 147 cm
• Engine power: 0.75 kW
• Tank Volume: 0.33 l
• Displacement: 27.2 cc (1.66 cu. in.)

Problems and Solutions for the Stihl FS 45

Problems with Stihl FS 46	Solutions
Bogging down	Clean spark arrestor, air filter, and carburetor
Carburetor problem	spray carburetor cleaner
Primer problem	Check the primer bulb, replace the cracked one
Spark arrestor screen problem	Replace the blocked spark arrestor screen
Whipper snipper not revving	Proper air-fuel ratio

1. Stihl FS 45 Bogging Down

Bogging problems typically involve fuel. Additionally, a spark arrestor issue in the muffler, where carbon buildup occurs, maybe the cause of the bogging down issue.

If there is any space between the coil and flywheel, the engine cannot run properly. When the shear pin is damaged, the engine may become less responsive.

The Fix

Inspect the entire fuel system, from the filter to the carburetor. Check to see if the carb is plugged. Ensure that the exhaust is clear to allow the fumes to leave. The spark arrestor has to be cleaned or replaced because of carbon accumulation.

Ensure that the kill switch is not shorting. Look if there is a proper distance between the coil and the flywheel. If the flywheel shear pin is even slightly broken, this will result in a slew of problems.

2. Stihl FS 45 Carburetor Problem

After the gas has been broken down, varnish and other debris may accumulate and clog the carburetor’s tiny fuel passages, resulting in a failure.

When a gas-filled trimmer is put away for the winter, the fuel partially evaporates, leaving behind a sludge that could partially obstruct the carburetor’s entrance ports.

There may consequently be enough fuel in the carburetor to start the engine but insufficient fuel to keep it going.

The Fix

While the air filter is off, spray carburetor cleaner into the intake. Allowing the varnish to sit for a few minutes will aid in its removal and disintegration. Replace the filter to restart the trimmer.

It can be challenging to disassemble a carburetor for a thorough cleaning. If your trimmer still doesn’t run properly after doing this, it would probably be best to take the carburetor to a mechanic.

3. Primer Problem

If you haven’t fully pressed and then released the primer for at least 10 presses, do it again to see if it solves the problem. It’s possible for the bulb and line to choke up or tangle.

The carburetor is connected by two fuel lines. These might get blocked. Old fuel lines may also cause.

The Fix

Since holes or splits in the plastic might develop over time, inspect the priming bulb for damage. Check the visible line to make sure it isn’t tangled or pulled if the bulb is still intact. Cracked primer bulbs can be quickly and affordably replaced.

Your issue might be resolved by draining the old fuel and replacing it with a mixture of new fuel and two-cycle oil.

The carburetor may need to be replaced if cleaning it doesn’t fix the issue. A new carburetor costs less money than a new string trimmer. The tank’s contents shouldn’t be older than 90 days.

4. Spark Arrestor Screen Problem

The spark arrestor screen may jam up on its own. Lack of power, especially when the engine is under load, poor acceleration, the engine’s inability to reach its maximum RPM, and higher than usual spit back via the carburetor are common symptoms.

A two-stroke, the air-cooled engine can overheat if the spark arrestor screen is almost entirely clogged. The engine stalls as a result of the piston expanding into the exhaust port.

The Fix

Replace the blocked spark arrestor screen. Before thinking about cleaning the current screen, every attempt should be done to install a new one. Peeler offers some advice on how to correctly clean the existing screen in the event that you are able to and desire to do so.

5. Whipper Snipper not Revving

If the center electrode is covered in dirt, it could be difficult to start the whipper snipper because the dirt can short out the spark and prevent it from jumping to the outside electrode.

Another significant factor is the incorrect ratio of fuel to air in the cylinder.

Another factor that may contribute to this issue is a clogged housing air filter.

The Fix

Need adequate oil fuel for the ratio. Cleaning dust from a spark plug is possible with a toothbrush or a tiny wire brush.

If you have tried a new plug and searched for loose wiring without success and still don’t get a spark at the plug, the module may be damaged and has to be changed.

Even if you’re merely cleaning the carburetor without performing any other maintenance or troubleshooting, always close the choke before removing the air filter to stop debris from entering the carburetor.

Frequently Asked Questions (FAQs)

Final Words

Although the FS 45 Gas Line Trimmer was not intended for longer, thicker grass, I tested it on that kind of material and it worked just fine. She’s a little sluggish at that sort of thing, though.

Although it is considerably more powerful than the FS 38, it is clearly not a brush cutter. It took some time to get it to operate and required some substantial tuning, but that’s to be expected with gas engines. I can recommend the FS 45 as a good all-around weed eater.

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