Chainsaw Husqvarna 142 - a reliable assistant in the household, but even she sometimes fails: then won't start when cold, then stalls when you press the gas, then it requires a dozen starter jerks to “wake up”. If your saw begins to act up, do not rush to take it to a service center: in 80% of cases, the problem can be solved on your own in 10–30 minutes. The main thing is to correctly diagnose the cause.

In this article we will look at all typical faults, due to which Husqvarna 142 It starts poorly, from a banal lack of spark to hidden carburetor defects. You will learn how to check ignition system, fuel line and compression without special tools, and also what to do if you saw starts only with a “choke” or stalls immediately after starting. For convenience, we have collected step-by-step instructions with photos, a table of symptoms and even a checklist for quick diagnosis.

We warn you right away: if you have never held a screwdriver in your hands, it is better to entrust the repair to professionals. But if you are ready to try, go ahead! Let's start with the simplest thing.

1. Checking the fuel system: why the chainsaw does not receive gasoline

The first thing to exclude is fuel problems. Even if you “filled up yesterday” and “everything was fine”, check:

  • 🔹 Gasoline quality. Husqvarna 142 requires fuel with an octane rating of at least AI-92. If flooded AI-80 or “scorched” gasoline, the saw will start with difficulty or will not start at all.
  • 🔹 Shelf life of the fuel mixture. Gasoline and oil are stored no more 30 days! After this, oil additives settle, and gasoline loses its volatile fractions.
  • 🔹 Fuel filter condition. It becomes clogged with small particles, and gasoline stops flowing into the carburetor.
  • 🔹 Fuel hose passage. Over time, it cracks or becomes pinched.

How to check?

  1. Drain the old fuel and fill with fresh mixture (gasoline AI-92 + oil for two-stroke engines in proportion 1:50).
  2. Disconnect the fuel hose from the carburetor and check if gasoline flows. If not, the problem is in the filter or hose.
  3. Blow out the hose with a pump (without a torch!) and rinse the filter in clean gasoline. If the filter is torn, replace it.
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If the saw starts “chuckling” and stalls when the lever is moved to the working position, it is most likely clogged impulse channel carburetor It can be cleaned with a needle, but it is better to contact a service center.

2. Diagnostics of the ignition system: no spark - no start

If fuel is supplied but Husqvarna 142 still won't start, check ignition system. The main culprits:

  • 🔧 Spark plug. It may be filled with gasoline, covered with carbon deposits, or simply worn out.
  • 🔌 High voltage wire. Often frays or comes off the coil.
  • 🌀 Ignition coil (magneto). Fails due to overheating or mechanical damage.
  • 📶 Gap between coil and flywheel. There must be 0.2–0.4 mm.

How to check the spark?

  1. Unscrew the spark plug, clean it of carbon deposits and dry it (if it is flooded).
  2. Insert the spark plug into the cap of the high-voltage wire and attach it to the cylinder (so that there is contact with ground).
  3. Pull the starter and watch for spark. If it is not there, the problem is in the coil or wire.
How to check the ignition coil without a tester?

If you don’t have a multimeter at hand, temporarily install a known working coil from another saw (for example, from Partner 350 or Stihl MS 180 - they are compatible). If the saw starts, your reel is faulty.

Symptom Probable Cause Solution
The saw does not start, the spark plug is dry No spark (coil or wire faulty) Replace the coil or wire, check the gap
The saw starts and immediately stalls Flooded spark plug or incorrect carburetor adjustment Dry the spark plug, adjust the carburetor
Weak spark, saw operates intermittently Spark plug worn out or contacts dirty Replace spark plug, clean contacts

3. Carburetor: why the saw starts and stalls

Carburetor Husqvarna 142 - this is the “heart” of the saw, and its malfunctions manifest themselves in different ways:

  • 🔥 The saw starts only with a “suction” and stalls when switched to operating mode.
  • 💨 The engine “sneezes” and shoots into the muffler.
  • 🛢️ Excessive fuel consumption or white smoke from the exhaust.

The most common problems:

  • 🔧 Clogged jets (especially after a long period of inactivity).
  • 🔄 Lost settings (for example, after unsuccessful adjustment).
  • 🛢️ Worn diaphragm or needle valve.
  • 🔌 Air leak through gaskets.

How to adjust the carburetor yourself?

  1. Find three screws: L (low speed), H (high speed), T (idle).
  2. Start the saw and warm it up for 5-10 minutes.
  3. Turn the screw L to maximum speed, then return 1/4 turn back.
  4. Screw T adjust the idle speed (the chain should not rotate).
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If, after adjustment, the saw still stalls when you press the gas, it is most likely clogged. main jet or the membrane is worn out. In this case, the carburetor must be disassembled and cleaned in an ultrasonic bath (or replaced).

4. Compression and condition of the cylinder-piston group

If Husqvarna 142 does not start hot or has lost power, check compression. The normal value for this model is 8–12 atm. If the compression is lower 6 atm, the engine will not develop enough power to start.

Reasons for low compression:

  • 🔧 Piston ring wear (especially after 500+ hours).
  • 💥 Seizure on the cylinder or piston (due to overheating or bad oil).
  • 🛢️ Valve failure (rarely, but it happens).

How to measure compression?

  1. Unscrew the spark plug and insert the compression gauge into the spark plug hole.
  2. Pull the starter 3-5 times and record the maximum value.
  3. If the compression is lower 6 atm, engine repair is required.

Filled with new fuel|Cleaned the spark plug|Adjusted the carburetor|Checked the spark|Did nothing-->

⚠️ Attention! If oil flies out of the spark plug hole when checking compression, this is a sign severe wear of piston rings or oil pump failure. In this case, it is better not to use the saw - it can become jammed.

5. Air filter and muffler: hidden reasons for poor starting

clogged air filter or muffler may cause Husqvarna 142 does not start or runs intermittently. Moreover, the symptoms are often similar to problems with the carburetor!

How to check?

  • 🌬️ Air filter: Remove it and try starting the saw without it. If it starts, the filter needs to be cleaned or replaced.
  • 🔊 Muffler: Unscrew it and inspect for carbon deposits. If it is clogged, clean it with a wire brush or replace it.

⚠️ Attention! Working without an air filter is only possible for diagnostic purposes! Long-term use without it will lead to accelerated wear of the piston group due to dust ingress.

Fuel and spark plug checked|Air filter cleaned|Spark checked|Carburetor adjusted|Compression measured-->

6. Mechanical faults: starter, clutch, bearings

Sometimes Husqvarna 142 hard to start due to mechanical problems, not related to the engine:

  • 🔄 Starter wear: The spring has stretched or the cord has broken.
  • 🔗 Clutch problems: The saw can start, but the chain does not rotate.
  • 🌀 Crankshaft play: a sign of bearing wear (requires urgent repairs!).

How to diagnose?

  • 🔧 Starter: If the cord does not return or is jammed, disassemble the mechanism and check the spring.
  • 🔗 Clutch: Remove the cover and inspect the drum. If it rotates with the engine at idle, the clutch is faulty.
  • 🌀 Bearings: crankshaft play is checked by rocking the flywheel by hand. If there is a game, the bearings need to be replaced.

7. When to contact service: signs of serious damage

Not all problems can be fixed on your own. Take the saw to a service center if:

  • 🔥 Engine jammed (cannot be turned by the starter).
  • 💥 It comes from the muffler black or blue smoke (a sign of destruction of the piston or rings).
  • 🛢️ In a top hat scuffs or chips (visible through the spark plug hole).
  • 🌀 Compression lower 5 atm even after replacing the rings.

⚠️ Attention! If you saw starts and immediately stallsand white smoke comes out of the muffler, this may be a sign oil entering the combustion chamber (for example due to a faulty oil pump). Prolonged operation in this mode will lead to coking of piston rings and major repairs.

Service repair cost:

Service Cost (RUB)
Diagnostics 500–1000
Replacing the piston group 3000–5000
Carburetor repair 1500–2500
Replacing crankshaft bearings 2000–3500

FAQ: Frequently asked questions about the Husqvarna 142 chainsaw

The saw starts only with a “choke” and stalls when switched to operating mode. What is the reason?

This is a typical sign lean fuel mixture (lack of gasoline) or air leak through the carburetor gaskets. Try:

  1. Adjust screw L on the carburetor (turn 1/4 turn clockwise).
  2. Check the fuel hose and filter - there may not be enough gasoline flowing in.
  3. Replace the carburetor gaskets (they may have dried out or torn).
After winter the saw will not start. What to do?

Most likely the problem is old fuel or dried gaskets. Drain the gasoline, wash the carburetor and fill with fresh mixture. If that doesn't help, check the spark and compression.

The saw starts and immediately stalls. What's the matter?

There are several reasons:

  • 🔧 Candle lit (dry it out or replace it).
  • 🛢️ The breather in the gas tank is clogged (blow it with a needle).
  • 🌀 Carburetor fuel pump is faulty (membrane needs to be replaced).
What kind of oil should I pour into the Husqvarna 142 to lubricate the chain?

Use only special adhesive oil for chains (for example, Husqvarna Chain Oil or Stihl ForestPlus). Regular motor oil does not adhere to the chain and burns quickly, causing tire and sprocket wear.

Can you use leaded gasoline?

❌ No! Husqvarna 142 designed for unleaded gasoline with octane number 92–95. Leaded gasoline will quickly damage muffler catalyst and may damage the piston group.