The petrol scythe has no power? 8 causes and repair [Guide]

The petrol scythe has no power? Discover the 8 most common causes and simple solutions!

The petrol scythe is an indispensable tool in every garden and allotment. However, what to do when your petrol scythe loses power, chokes when trying to cut or runs unevenly? Before you take your equipment in for service, check the most common causes of this problem. In this step-by-step guide, we explain how to diagnose and repair the malfunction so that your scythe can regain full performance.

1. Clogged air filter - a silent power killer

This is by far the most common and easiest culprit to remove. Air filter protects the engine from contaminants. When it's clogged with dust and grass residue, not enough air gets into the engine. The fuel-air mixture becomes too rich in fuel, which directly causes a a drop in power and throttling of the scythe.

• Solution: Remove the filter. If it is sponge-like, wash it in warm water with mild detergent, dry it thoroughly, and install it back in place. It is imperative to replace paper filters or very worn filters with new ones.

2. Carburetor problem - dirt or bad adjustment

The carburetor is the heart of the scythe, which creates the perfect fuel mixture. If it is contaminated or unregulated, typical symptoms appear: the petrol scythe fires hard, goes out when you add gas and does not go into revs.

• Solution: For starters, try using a special spray carburetor cleaner. If this does not help, it may be necessary to carburetor adjustment (H and L screws) or its more thorough cleaning, which is best done by an experienced service provider.

3. Clogged muffler or spark screen

In two-stroke engines, carbon deposits (unburned oil and fuel residues) accumulate in the exhaust system. A clogged muffler blocks the free flow of exhaust gases, leading to engine overheating and a marked loss of efficiency.

• Solution: Remove the muffler and mechanically remove the carbon build-up. Also check the condition of the spark arrestor grid (if present) - it is often the one that is completely clogged.

  • Important: Perform activities such as burning carbon black with a blowtorch with extreme caution!

4. Worn or dirty spark plug

A weak or erratic spark is a guarantee of problems. A worn spark plug prevents the mixture from burning properly, causing the scythe to break and have no power.

• Solution: Unscrew the candle and assess its condition. A black, sooty tarnish indicates a mixture that is too rich, and a white tarnish indicates a mixture that is too poor. Best replace the spark plug with a new one, dedicated to your scythe model, remembering to set the correct gap on the electrode (usually 0.6-0.7 mm).

5. Old or improper fuel mixture

Fuel for 2T engines (gasoline-oil mixture) loses its properties after just 30 days. Using weathered fuel or the wrong proportions is a simple way to power problems.

• Solution: Always use a fresh mix, prepared according to the manufacturer's recommendations (e.g. 1:40 or 1:50). Use high quality oil for two-stroke (2T) engines.

6. Leak in the fuel or intake system

A cracked fuel line, a loose band or a worn gasket under the carburetor cause the engine to suck in "fake" air. This upsets the mixture ratio, making it too lean and causing unstable operation and power loss.

• Solution: Carefully inspect all fuel lines, their connections, and the seals between the carburetor and cylinder. Replace any worn or damaged component.

7. Wrong cutting line - too thick or too long

Many users don't realize that the wrong line can drastically stress the engine. Line too thick creates tremendous resistance, and too long overloads the transmission and engine, preventing it from reaching full speed.

• Solution: Use the line with the diameter recommended by the manufacturer (usually 2.0 mm - 2.7 mm). Make sure that the sections extending from the head are not too long.

8. Problem with cutting head or bevel gearbox

If the head itself is blocked by dirt or poorly assembled, it will put resistance and strain on the engine. A neglected bevel gearbox, which lacks lubricant, has a similar effect - friction increases and power decreases.

• Solution: Regularly clean the head and check the condition of the grease in the bevel gear (refill it according to the instructions).

Summary: How to take care of a scythe so that it always has full power?

If your petrol scythe has no power, first check the simple things: air filter, freshness of fuel, condition of candle and proper line. These are the most common culprits. Regular maintenance and the use of quality consumables are the keys to reliable operation for many seasons.

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