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I purchased a Stihl 036 chain saw at a yard sale. I have cleaned the carb, fuel tank and filter and the air filter. I filled the fuel tank with fresh gas/oil mixture (50:1 ratio), installed new spark and have spark to the plug but it still will not start. I adjusted the low and high needles to l 1/2 turns out. Any suggestions?

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Your “Product Instruction Manual’ can be downloaded here:
Page 39 lists “H” and “L” initial carburetor settings Careful needle valves if over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly. Your settings may be to rich.

Was this saw perhaps operated in a lean condition (metal transfer from the piston to cylinder wall)? This may be caused by many things including; leaky intake connections at the engine or carburetor; leaky crankcase seals; or running on gasoline containing no 2-cycle oil.
1. Remove the spark plug wire and plug. Remove the muffler, hold a light at the plug hole and inspect the cylinder through the exhaust port. Is it smooth and shiny or does it appear speckled with dull gray spots or smears?
2. Pull the starter slowly, inspect the piston as it rises and falls. Is it a dull gray without scratches and gouges?
3. Hold the light at the exhaust port and look through the spark plug hole, inspect the cylinder above the exhaust port. Is it shiny and smooth or speckled with gray spots or smears?
Any spots or smears on the cylinder or deep scratches and gouges in the piston indicate the saw was operated in a lean condition. Repair of this on a home owner quality saw often exceeds replacement cost. A repair estimate by an independent saw shop should be considered.

If still not able to start please reply below and we will continue. HTH

Posted on Jan 21, 2010

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It probable wont start because the air gap is to wide, or the piston cyclinder are scored, this is very common in stihl chain saws and cut saws. Air gap should be about a buisness card, and if it is the other you will need to replace the piston and cylinder.

Posted on Jan 21, 2010

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Posted on Jul 20, 2009

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My chain saw starts but won't keep running what is wrong with it

Sparkplug ,If not. Try saw on half Choke, if works check filter in tank.

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The fuel lines may have become airlocked.This can happen if the tank is run dry. If the saw has a primer bulb, alternatively press it several times and then try to pull start the engine with choke on. Repeat this several times. The primer bulb should feel spongy and fill with fuel.
If you're up to it, you can dismantle the carburettor and clean any dirt from valves.The carburettors on chainsaws, hedge cutters etc are very fiddly with delicate diaphragms, valves and springs so you have to be careful to avoid damage or loosing parts.
Ensure air filter is clean. Foam elements can be washed with hot water and detergent, squeezed dry in a cloth and re-oiled with a teaspoon of engine oil spread through the foam. Paper elements can be cleaned with compressed air blown from the inside of the filter but ideally should be replaced.
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First check your fuel filter. Its on the end of the pick up tube in the fuel tank. Could be clogged. this is a relatively easy and inexpensive place to start. Make sure the fuel supply isnt pinched anywhere along the way.

Could be a scored cylinder. A scored cylinder is common problem with all makes of chainsaws. If you dont take special care to keep the air filter clean and in perfect working condition, the wood chips and dust will enter the combustion chamber and score the cylinder walls, ruining the rings causing a loss of compression.

The piston could also have been damaged from running to lean of fuel to air mixture causing heat damage to the piston and cylinder.

Hope this was helpful. If so, gimme a thumbs up vote!

Thank You

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best regards savumihai71

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