Hi, My chainsaw started perfectly, I ran it for two minutes to check it was oiling the bar properly and then stopped it. I went a few yards to where was working and then I couldn't even pull the starting rope all the way, it was as though the engine was meeting full compression and not allowing it to turn further. I have removed the plug and the engine turns freely, I can't think what could be causing this in a 2 stroke engine- any ideas please?

Your cylinder could be loaded up with fuel. with the plug in you can not compress a liquid. if this is the problem, with the plug out you should get a spray of fuel through the plug hole when you pull over the saw. make sure the stop switch is turned off to ensure no sparks will ignite the fuel. if this is the problem, your carburator may need cleaning or your choke was on to long. also check for a plugged exhaust screen in the muffler.

Did you add 2-cycle oil to the fuel you put in it?
Determine if the warranty is active first. Most warranties are effective for 1 to 5 years. If yes return it to where it was purchased or find an authorized repair facility. A written diagnosis by a good independent saw shop ($10-20) might be a good idea at this point. It is difficult to argue repair charges with an authorized repair facility without some documentation in your favor.
1. Remove the starter housing. Does the starter operate smoothly? If yes, reinstall the cover and continue with 2, if no repair starter.
2. 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.
3. Was this saw perhaps operated in a lean condition (metal transfer from the piston to cylinder wall)?
· 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?
· 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?
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.
4. The last likely possibility is the saw has jumped timing. This problem or any not discussed is usually beyond the ability of the operator to repair. Please take it to a good local saw seller/mechanic for a written diagnosis before authorizing any repair. HTH
Lou