Starting a chainsaw Husqvarna - this is the first and critically important stage of work, on which not only the speed of starting sawing, but also the durability of your tool depends. Many users make the common mistake of ignoring the sequence of actions, which leads to overflow of the spark plug, water hammer in the cylinder, or simply the inability to start the engine in the field. The correct algorithm for starting a cold engine is fundamentally different from starting a hot unit, and knowledge of these nuances is the basis for any owner.
In this article we will analyze the detailed process of preparing and starting a chainsaw, paying special attention to working with the carburetor and fuel system. You will learn why the position of the chain brake when starting is important and how to avoid common mistakes that can lead to piston group out of order. Following the manufacturer's recommendations will allow you to start the tool with one pull of the starter, even after a long period of inactivity.
Before pulling the starter cable, you need to make sure that the tool is in good condition and filled with a high-quality fuel mixture. Ignoring a preliminary check can result in you wasting energy trying to start a technically sound, but incorrectly prepared saw. Let's look at the basic steps before actually starting the engine.
Preparing the fuel mixture and checking systems
The first step in preparation for launch is to check the quality of the fuel. Chainsaws Husqvarna are equipped with two-stroke engines that do not have a crankcase lubrication system with oil, so the lubricating component must enter directly into the fuel mixture. Using pure gasoline without adding special two-stroke oil will lead to instant scuffing of the piston and cylinder due to dry friction. Mixing must be done in strict proportions, usually 1:50 (2% oil) or 1:33 (3%), depending on the recommendation for the specific model and type of oil used.
It is important to use fresh gasoline with an octane rating of at least 90-92, since old gasoline loses its properties and forms a tarry coating that clogs the carburetor jets. If you plan to store the saw for more than a month, it is better to empty the fuel tank and use up the remaining fuel at idle to avoid souring of the membranes in the carburetor. The quality of the mixture directly affects the stability of idle speed and ease of starting.
In addition to fuel, it is necessary to visually inspect the air filter and the condition of the spark plug. A filter clogged with sawdust cuts off air flow, creating a mixture that is too rich and difficult to ignite. The candle should be dry, with brown soot; if it is wet and black, it means that you filled the engine with gasoline in previous starting attempts. In this case, you need to unscrew the spark plug, wipe it dry and blow out the cylinder by pulling the starter several times with the spark plug unscrewed.
Use only synthetic two-stroke engine oils labeled JASO FD or ISO EGC - they provide better lubrication and less spark plug soot, making cold weather starting easier.
Checking the tightness of the fuel hoses and the mesh filter inside the tank will also not take much time, but will save you from problems with the fuel supply. If there are cracks in the hoses or the filter is detached from the hose, air will be sucked into the system, making normal engine operation impossible. Make sure the fuel tank cap is tightly closed and the vent hole is not clogged with dirt.
Cold engine starting algorithm
Starting a cold engine is the most difficult procedure, requiring precise adherence to the sequence of actions with the control levers. Unlike a hot engine, a cold unit requires enrichment of the mixture for first ignition, which is achieved by moving the throttle control lever to a special position. On most models Husqvarna this process is standardized, but requires physical strength and proper technique for pulling the starter.
First, you need to place the saw on a flat, hard surface, making sure that the bar and chain do not rest against anything. Chain brake must be turned on (the brake handle is moved forward to the toe of the tire) - this is a mandatory safety requirement that prevents the chain from spinning when starting. Some models may not start or may start with a jerk if the brake is off, as compression will be lost to the chain spinning.
☑️ Algorithm for starting a cold saw
Next comes manipulation of the combined control lever. It needs to be pulled out to the first fixed position (cold start mode). After this, holding the front handle with your left hand and pulling the starter handle with your right, you need to make several jerks until the engine tries to grab (the first flash occurs). As soon as the engine “sneezed”, the combination lever must be returned to the middle position (warm-up/running mode) and the starter pulled again - the engine should start.
⚠️ Attention: Never throw the starter handle after a jerk - it should smoothly return to its original position under the action of a spring. A sudden release can damage the starter mechanism or cause the cable to become jammed.
After a successful start, the engine will operate at higher speeds. It is necessary to briefly press the throttle trigger so that the control lever automatically moves to the idle position, and allow the engine to warm up for 10-15 seconds. Only after warming up can you turn off the chain brake and start working. If you immediately release the brake on a cold engine, the chain may start to rotate, which is dangerous.
Starting a hot engine and restarting
The situation with starting an already warmed-up engine that was stopped for a break or move is radically different. In this case fuel mixture in the carburetor is already in the desired state, and additional enrichment through the choke (combination lever) will lead to overflow. If you try to start a hot saw with the choke on, you will likely flood the spark plug and be unable to start the tool until it dries out.
The algorithm of actions for a hot start is as simple as possible: make sure that the chain brake is on, move the combined lever to the middle position (operating mode) or immediately to the “open damper” position, if the model allows it. Pull the starter handle sharply. The engine should start almost the first time. If the engine does not start after 3-5 attempts, it may have cooled down or, conversely, overheated, and then you should try the starting procedure as for a cold engine, but very carefully.
Why can’t a hot saw be started with suction?
When the engine is running, some of the fuel condenses in the carburetor. If you turn on the cold start mode (suction), the damper will shut off the air, and when the starter cranks, too much gasoline and not enough air will enter the cylinder. The spark plug will get wet, the spark will disappear, and starting will become impossible without unscrewing and drying the spark plug.
It is important to remember the temperature regime. If the saw has been working hard and the engine is very hot, you may experience a “thermal shock” effect or a vapor lock in the fuel line. In such cases, it is recommended to allow the instrument to cool for 5-10 minutes before restarting. This will also help extend the lifespan crankshaft oil seals and piston group.
Carburetor adjustment for a confident start
If the chainsaw Husqvarna If the car won't start or only starts when the throttle is wide open, the problem often lies in the carburetor settings. There are usually three adjustment screws located on the carburetor body, designated by the letters H, L and T (or LA). Screw L is responsible for the quality of the mixture at low speeds and affects starting, screw H regulates the maximum speed, and the screw T (or LA) — idle speed.
For reliable starting of a cold engine, the screw L must be configured to ensure sufficient enrichment of the mixture at the time of start. If the screw is turned out too much (lean mixture), the saw will not start. If it is turned too tight (rich mixture), the engine will choke. The factory setting is usually marked with paint or sealed, but during operation it may be necessary (fine tuning) due to changes in atmospheric pressure or fuel quality.
| Adjustment screw | Function | Impact on launch | Consequences of incorrect settings |
|---|---|---|---|
L (Low) |
Mixture quality at low speeds | Critical for the first setting | Doesn't start or stalls when pressing gas |
H (High) |
Power at high speeds | Affects throttle response after starting | Overheating, loss of power, carbon deposits |
T / LA |
Idle speed | Stable operation after warming up | Stalls at idle or the chain spins |
Adjustments should be made carefully, turning the screw no more than 1/8 or 1/4 turnover. Before making adjustments, make sure the air filter is clean, as adjusting the carburetor with a dirty filter will result in improper operation if the filtration is clean. An ideal setting allows the saw to quickly pick up speed without dips and maintain a stable idle speed.
Typical problems and solutions
Even if all instructions are followed, situations may arise when the chainsaw refuses to start. One of the most common causes is an overfilled spark plug. This occurs when the user pulls the starter too many times without waiting for the choke to fire, or when the mixture is too rich. In this case, the spark plug must be unscrewed, thoroughly wiped with a napkin, heated over a fire (if there is carbon deposits) and the engine cylinder must be blown out.
Another common problem is lack of spark. You can check this by unscrewing the spark plug, putting the tip of a high-voltage wire on it, pressing the thread against the metal of the cylinder (ground) and pulling the starter. If there is no spark, the problem may be with the spark plug, ignition coil (magneto), or the gap between the coil and the flywheel. The gap should be approximately 0.2-0.3 mm, it can be adjusted using a feeler gauge or a piece of paper.
⚠️ Attention: When checking the spark, hold the spark plug only by the insulator or use insulated pliers. Direct contact with the metal part of the spark plug in the presence of a working ignition system can result in a noticeable, although not fatal, electric shock.
It is also worth checking the condition of the fuel filter and the breather hole in the tank cap. If the filter is clogged or the hole is blocked, a vacuum is created in the tank, which prevents fuel from flowing into the carburetor. Try opening the tank lid slightly when trying to start - if the saw starts, then there is a problem with the tank ventilation.
Starter care and prevention
The manual starter mechanism is a unit that experiences significant mechanical loads. To ensure that starting the chainsaw is always easy, you need to monitor the condition of the starter pulley and return spring. Periodically, it is recommended to disassemble the mechanism, clean it of old grease and dirt, and re-lubricate it with heat-resistant grease. This is especially true for models operated in winter or in dusty conditions.
Starter cable breakage is a common problem caused by sudden jerking or wear. When replacing the cable, it is important to wrap it correctly around the pulley, ensuring tension on the return spring. If the spring is weakened, the starter will not pull the entire cable back, making it impossible to start again. Correct winding provides a margin of several turns for confident return of the handle.
Regular cleaning of the cylinder cooling fins from sawdust prevents engine overheating, which directly affects the ease of starting a hot engine and the absence of detonation.
Don't forget to check the condition of the ratchet mechanism that engages the starter handle with the engine crankshaft. Worn ratchets can slip, causing you to pull the starter in vain without turning the crankshaft. In this case, it is necessary to replace the plastic or metal elements of the trigger mechanism.
Safety when running the tool
A chainsaw is a source of increased danger, and the starting procedure is no exception. Always hold the saw firmly, with the toe of your boot resting on the rear handle or pressing it to the ground with your left foot through the handle. The right foot should be outside the plane of movement of the chain. Never start a saw while holding it in your hands ("by hand"), unless you have special skills and this is not provided for in emergency instructions for a specific model, since the inertia of the jerk can lead to injury.
Make sure that there are no people, animals or objects around you that could be hit by the chain if it turns unintentionally when starting. Minimum safe distance - 3 meters. Also check that the tire mount nut is securely tightened, as vibration during startup can loosen loose connections.
The use of personal protective equipment (PPE) is mandatory even during the start-up phase. Special glasses will protect your eyes from possible rebound of debris or dust raised by the starter, and vibration-proof gloves will reduce the load on your hand joints when jerking. A negligent attitude to safety in the first seconds of work can cost your health.
Is it possible to start a saw without a chain?
It is highly not recommended to start a chainsaw without a chain and bar installed. When operating without load at high speeds (if the engine starts and gains speed), overheating and damage to the crankshaft bearing and oil seal may occur. In addition, without a tire, the chain is not tensioned, and the clutch mechanism may not work correctly.
Why does my Husqvarna chainsaw start and immediately stall?
Most often this indicates an incorrect setting of the idle screw (T or LA) or clogged carburetor channels. The cause may also be air leaks through the crankshaft seals or fuel hoses. If the engine stalls when you press the gas, the propeller setting is probably wrong L (low speed) - the mixture is too lean.
How often do you need to change the spark plug on a chainsaw?
The life of the spark plug depends on the quality of the oil, gasoline and the intensity of work. On average, it is recommended to change the spark plug once per season of active use or every 100 engine hours. However, if the plug produces a consistent spark and does not have heavy carbon deposits, it may last longer. Always have a spare spark plug in your tool kit.
Is it possible to use AI-95 gasoline for a Husqvarna chainsaw?
Yes, the use of AI-95 gasoline is acceptable and even preferable for modern models with catalysts, since it contains fewer harmful impurities and ensures cleaner combustion. The main requirement is the freshness of the fuel (no older than 1-2 months) and proper mixing with two-stroke oil.
What to do if the saw does not start after winter?
Most likely, the fuel left over from last season has dried out in the carburetor and clogged the jets, or the membrane has soured. It is necessary to drain the remaining fuel, unscrew the spark plug, and blow out the cylinder. If this does not help, you will need to disassemble and ultrasonic clean the carburetor or replace it. Prevention: Always drain fuel before long-term storage.