If you have more questions or need additional help pleasereply below and I will get back to you. HTH & Good Luck.
Lou
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Remove the starter cover.
Inspect the flywheel and crankshaft under the starter cover. Are the woodruff key slots on the crank shaft and flywheel aligned and the key intact? If not; Please consider taking the saw to a good local saw seller/mechanic for a written diagnosis before authorizing any repair or ordering any parts; if yes continue.
Does the starter operate smoothly? If yes, reinstall the cover and continue with 2, if not repair the starter.
Is the saw equipped with a decompression valve? Yes continue, no proceed with 3.
Leave the ignition off, set the valve and pull the starter.
Pull gently to release the valve. Is there a difference in the effort required?
If yes continue with 3, if no repair or replace the decompression valve.
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 but not limited to; leaky intake connections at the engine or carburetor; leaky crankcase seals; cracked fuel delivery lines; running on gasoline containing no 2-cycle oil.
Disconnect the spark plug wire and remove the plug. Remove the muffler (clean it and the spark arrestor before reinstalling), 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?
Pull the starter slowly, inspect the piston as it rises and falls. Is it a dull gray without scratches and gouges?
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?
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I have same saw with similar complaints. Ocurred after installing new starter rope. In my case the problem was caused by the rope being too small in diameter causing it to wedge intermittently in the pulley.
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