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I'd say the most probable culprit is the fuel.... I'd first try dumping the tank out, mixing fresh gas with the addition of a fuel stabilizer and start the saw. It'll quickly vent any old gas in the line and should begin to run fine with the new mix. If not, consider returning it to the service center for adjustment.
Never use gas that has sit on a shelf for months at a time as it becomes 'stale' (for lack of a proper term). Todays 'formulated fuel' can be a cause a bit of a problem for some small engines. Anytime you refuel, shake the can to remix prior to filling.
The oxygenated nature of the blended gas sometimes causes the chain saws to run a little 'lean'...meaning too much air to fuel ratio which could be a portion of your problem. A lean running saw will run hot and scoring of the piston or cylinder wall is possible. Some finely tuned professional saws need carb adjustments between the summer blend and the winter blend gas.
Tecumseh engine right? Pull the float bowl off the carb. I suspect some water contamination. while it is off clean the jet holes in the nut. They may have varnisized gas in them. contact me with any more questions.
It's one of two things. My first thought is that you have a clogged gas cap. Try loosening it when the mower starts to run ruff. If it smooths out again and runs fine, then you know that the carburetor is not venting properly. Either buy a new gas cap or clear the breathing holes in the cap, if possible.
The only other thing it can be is that your Ignition Coil is going bad. A bad Coil, once it gets hot, will shut down. But it usually takes longer than 5 minutes for them to cool down well enough to start back up.
Get some sta-bil fuel stabilizer. add twice the amount recommended on the bottle for storage to your mixed gas. Empty out chainsaw tank and refill with the new mix. Rub for 2 minutes, then shut off. Remove cover over carb and spray inside carb, soaking it down good and cleaning all internal surfaces visible - allow to sit overnight. Next day Spray down carb with carb cleaner for about 15 seconds. Start saw, allowing 2 minutes to warm up and reduce choke. If saw stalls, restart and spray inside carb as it runs with choke on - keep motor at the highest rpms you can as you spray - spray in 2 second bursts, not allowing motor to stall from spray. If it stalls, change sparkplug and try again. You have varnish build up in the carb and are trying to remove it so the carb will work without the choke. This may take some time but it is the exact procedure I used for my Poulan Team Realtree last spring - I spent about an hour spraying and staring before it ran without the choke. Good luck!!
Engines require 3 things. Spark, compression and fuel. And chainsaw need 2-cycle oil mixed with the gas.
Assuming you have the right oil-gas mixture and a fresh batch of gas, and you didn't leave old gas in the saw all summer long since last November.
-Take off the dirty air filter and see if saw starts without filter. Do not run without putting in new filter. -Check exhaust port for mud dobber home or screen clogged with carbon and dirt -See if saw fires up after squirting WD-40 directly into carburetor -Check gas line >>> pull gas line loose and see if gas flows out of tank to carburetor -Take out spark plug > put finger over spark hole and pull cord >> do you feel suction that says you got compression? -Put spark wire back on spark plug >>> hold spark plug so threads touch bare metal part of spark plug hole >>> pull starter cord and see if spark shows between plug and saw >>> suggest you not hold metal part of spark plug while pulling cord [you'll understand why] -If spark plug shows spark, then your saw has spark ... so put in new plug and start fresh.
If your saw has compression, spark, and fuel it should start unless carburetor is gummed up because gas was left in tank. Here is the final trick. Start the saw while spraying WD-40 directly into carburetor and see if you can keep it going with the WD-40. This might take a helper. If this does not work, then carburetor is bad or gas line is clogged at carburetor. Time to take it to the shop.
Try venting the gas cap for a moment and attempt restart. If it starts, check for a plugged tank vent which should be a bronze disk set into the tank casting and located above the filler cap under the left side cover. When you changed the plug, was it wet with fuel inside? Also, check for spark at the plug when it won't start. You may have ignition problems that occur with engine heat. Hope some of this helps!
if gas is in the oil the needle and seat in the carb are bad or some thing in it. the gas will go in to the crank case and load the cylinder with gas. you can take the carb apart to see if something is in the seat. or replace the carb
First change the plug with a new one with the same heat range.Clean the cilinder wings and the fan housing holes.Check the air and gas filters(clean them).Change the gas from gas tank.Dsassembly,check and clean the carb with compressed air.
Start the engine.