The Husqvarna 350 chainsaw operates through three basic mechanisms: air, fuel and ignition. Without all three of these mechanisms working in conjunction, the chainsaw will either run poorly or not work at all. When there is a problem with your chainsaw, try to isolate the problem to determine which mechanism is causing the issue. Once you've isolated the affected engine function you can make the necessary adjustments or repairs.
Loosen the wire connected to the spark plug on top of the 350's engine. Use a socket wrench to unscrew the spark plug. Check the rubber boot to see if it's loose or poorly connected. Insert the replacement plug into the rubber boot so the metal igniter points outward.
Lay the 350 onto the ground. Put on leather work gloves and hold the rubber boot 2 to 3 centimetres away from a metal point on the engine block that is grounded.
Pull out the starter rope quickly four times and look for a blue spark. If you see a yellow spark or no spark, your ignition module and coil are damaged and need replacing. If there's a blue spark you can rule out the ignition source for your problem.
Unscrew the top cylinder cover. Take the air filter out of its mounting box. Brush the mounting box, cover and surrounding area off. Wipe them clean with the rag. Separate the foam part of the filter from the plastic. Drip a few drops of clean gasoline onto the foam. Slap the filter against your palm to shake off any gas. Reinstall the air filter components.
Unscrew the front cover on the muffler. Withdraw the spark arrester screen from the muffler. Douse the screen in gasoline and scrub it with the brush. Scrub out the muffler and exhaust port. Replace the muffler if you notice heavy black carbon deposits covering the walls and exhaust port.
Connect the compression gauge to the empty spark plug hole. Hold the gauge while cranking on the starter rope at least five times. Check the compression gauge for a reading of at least 90 psi. If compression is lower than this, you will need to take the engine apart to find the source of your air leak.
Drain any fuel left over from the last use. Scrub out the fuel tank with the brush and rag. Pour about 1 tbsp of the clean gas into the tank, replace the cap and swish the gas inside the tank for a few seconds. Drain the gas again.
Pull up the fuel filter from the tank bottom. Disconnect the pickup body (fuel filter) from the tip of the fuel line using the needle-nose pliers. Throw away the old filter and insert the nozzle of the new filter into the fuel line. Refill the gas tank with freshly mixed chainsaw fuel that has a gas to oil ratio of 50:1.
Open the choke to its halfway setting. Remove the filter cover and air filter. Try starting the engine and as soon as it pops squirt a blast of carburettor cleaner directly into the open choke. Let the engine run until the smoke clears. If the engine still won't start after the carburettor cleaner, you will need to remove and clean your carburettor.
Things you need
- Deep set socket wrench
- 3/4 nut attachment
- Replacement spark plug
- Leather work gloves
- Clean gasoline
- Compression gauge
- Needle-nose pliers
- New fuel filter
- Chainsaw fuel (50:1 gas to oil ratio)
- Carburettor cleaner