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There are several steps that should be followed to complete a tune up. First and foremost is safety. Ensure that you are wearing proper eye protection, hearing protection, and a sturdy pair of leather gloves.

Keep hands and other body parts away from the bar and chain at all times when a saw motor is being started or is in operation.

With the engine off you need to check that you have fresh Fuel/Oil Mix, bar and chain oil, and that your chain is sufficiently tight on the bar. I like to pull up on the chain about midway down the bar. If I can pull the bottom of the tooth out of the bar it is to loose. My preferred tightness is where the bottom of the tooth is just barely within the bar slot.

Check your sprocket on the end of the bar, does it show signs of heat fatigue? If so check for warping. If no warping is discernible then ensure that the sprocket has been properly greased. There is a special plunger tool that can be had at most saw shops. It is a lifesaver.

Next, try to start the saw. I like to begin starting by just pulling the cord with the engine switch on. Does it try to start?

If not choke the engine and repeat starting. If it fails to start then prime engine with bubble pump for 3-6 pumps. Repeat starting procedure. If the egine begins to start go to a half choke and repeat. Once engine is running you can open the choke and check for the sound of engine. Release the chain brake and rev to high RPM. What does it sound like? I would recommend trying to cut some limbs to check the engine under load.

Is it struggling? If so then you may have an issue.

Shut off the engine and allow to cool. Remove the air filter and check for cleanliness. If it needs replacing or cleaning then follow manufacturers instructions. Use your Chain/Wrench and remove the spark plug. Does it look worn? Black carbon deposits are normal. White is not. If it is white then your sparkplug may be the wrong size. Look in your owners manual for the proper spark plug and replace. Also, check for proper gap.

If none of the above fixes your problems then mixture settings are the next step. Unfortunately, that is not something I can walk you through the steps of. It requires more ear training and knowing what a saw should sound like and how to make the changes. Going to far will starve the engine going the other way could cause catastrophic results. Also, current EPA guidelines don't allow much adjustment. There is a special tool available but, is really difficult to find.

Hope this helps. If in doubt I would recommend a Sawyers Safety Course and a visit to your local saw shop.

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Wiki User

15y ago

What else can I help you with?