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Your carb is starving gas from your saw. You will have to remove the carb. and take it apart, check the diaphragms for hardening or splitting, clean all passages and screen. There is a lot of small parts that have to be put back together correctly, also the diaphragms and their gaskets have to be installed right.
It's not getting gas. Possible wrong mix oil to gas, but not real likely. Possible sat over the last winter with gas in it and varnished. I'm guessing this is the one, more likely than not. take cover and filter off and clean and bag 'em. pour carb cleaner in the carb and soak overnight. Dump out (carb cleaner and old gas)into a sealable jar or can and fill with straight gas and soak an hour and dump into trash gas/carb cleaner. Use a bicycle pump to blow air into carb to dry it. At most use a computer air can. Then start with the right gas/oil mix, prime it, set the trigger and choke and drop start. (It helps to have the spark plug out during the soak. Then clean it and sandpaper the gap and the magneto area on the flywheel).
Chain saws are known for plugged/pinched fuel lines
Drain the fuel tank Remove the fuel line from the carb. Blow air back in to the tank Rinse out the tank Repeat several times Make sure your gas cap is clean and the vent in the cap is not plugged. Make sure your air filter is clean Refill with clean gas mix from a clean gas can It should run for you Let me know if this does not solve your troubles
Fuel starvation - 'lean fuel' condition
Basic things to check: 1) spark plug 2) spark arrestor in muffler 3) fuel lines and tank filter 4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn Chain Saws: 5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then: Remove Carburetor 6) replace gaskets/diaphragms a) use a spray carb cleaner to clean jets, holes, and body of carb b) fuel pump diaphragm goes against the carb body, then the gasket towards the outside c) metering gasket goes against the carb body, and the diaphragm goes towards the outside
My guess is since you have ignition, it is a fuel issue: 1- the carb or the fuel lines or pump are plugges with dirt, 2- fuel pump is not working,3- carb needs cleaned 4- air filter is plugged which is very common also. When the saws sit for 6 months or so, the cylinder tends to get gummed up cause our gas is SO good & when this happens with one of my saws, I put spray lube in the spark plug hole & turn it over. When I am thinking, I store my saws with the gas tank down, so that gas isnt running into the carb/engine.
If you have a compression gauge, check the compression. Anything under 90psi is too low.
Check your flywheel key. If it is broken the flywheel will move and not fire at the correct time.
Note: if it does not sputter with carb cleaner then it's not your carb.
Next: Remove your exhaust manifold. Look into the cylinder with a flash
light. You are looking for scratches. Anything larger then a light
fingernail is definite proof you need a new cylinder/piston assy.
If it passes that test do the following:
mixed fuel straight into your cylinder until 1/4 full. Slowly pull your
saw over while looking into the cylinder. If you see bubbles after the
ring/rings go by then you need a new cylinder/piston assy. On rare
occasions if no scratches are present on the cylinder wall or piston,
you may be able to change just the rings.
Hi brandon First change the sparkplug with the same heat range,Check and clean the gas filter with compressed air.Remove the carb and very carefully disassembly entirely.Check the gaskets and the diafragms.At the fuel pump side there is a fine screen(clean it).Check the needle,the spring and lever.Unlock the screws L and H(note how many turns are they).Put the corp of the carb in a special clean solution for 12 hours and then clean it with compressed air(something is clogged there).Put all back together and try to start the engine. regards savumihai71