IT'S GOT SPARK, BUT FLOODS OUT. PULLED AND CHANGED THE PLUG, CLEARED CYLINDER SEVERAL TIMES, BUT STILL GETTING FUEL OUT MUFFLER AND CARB. IT RAN ABOUT TWO MONTHS AGO AND I DON'T RECALL HAVING ANY PROBLEMS WITH IT. THE FUEL IS O K .
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Could be the spark isn't as strong as you think it is. Could be the spark weakens when the unit is warm. Electronic module ignition needs an energetic pull at the best of times to get a strong enough spark for starting and if it is weaker it would be impossible to pull the starter cord fast enough.
Instead of testing the spark with the standard spark plug try using a spare plug with the gap opened to about 1 to 1.5 mm. The atmosphere in the cylinder during compression is much more dense than in open air and a much stronger spark is needed to jump the gap.
If the spark is satisfactory it could be the crankcase compression that is low, perhaps leaking past the crankshaft seals. If the chainsaw is little used and stands idle for longish periods this could be the problem. Seals tend to lose flexibility quicker under those conditions.
Ron, the excessive gas could be the result of continued start attempts with a weak spark or a bad plug or a carboned plug. If none of the carb adjustments have not been turned or twisted prior, I'd suggest obtaining a fresh spark plug. Make sure the gap is correct. Blow out the cylinder with compressed air to vent all the residual gas/oil within. Ground the new plug against the engine and pull the cord. You should observe a fairly bright spark at the plug. If no spark you could have a faulty coil/ignition module. If a bright spark is present, install the plug and give it full choke and attempt to start. It should attempt to start within a few pulls....when it does, go immediately to HALF-choke and pull again and it should start.
DO NOT , I repeat do not use starting fluid on a 2 stroke chainsaw or trimmer. you will score the cylinder or the piston. When trying to diagnose a hard to start motor just give it a small squirt of mix in the carburetor. If it won't fire you have a compression problem or an ignition problem. when you test for spark make sure you have a good plug, that is well grounded and not in bright sunlight which can make it hard to see the spark. if you have spark, do a compression test.
Some saws with autotmatic oiling will leak bar oil into the cylinder and cause this. Pull out the spark plug and hold the saw so the oil runs out of the spark plug hole. Pull the starter cord till no more oil sprays out of the hole.Clean the oil off the plug and start your saw. It will smoke more than normal till the extra oil is burned out.
If the carb is flooding it will fill the cylinder with fuel, this will cause a hydralic lock, making it near impossible to crank the engine, remove the spark pluf, turn the ignition off, crank the engine, if fuel pours out of the plug hole then it is well flooded, you will need to get a pressure test on the carb to check the needle is not leaking, this will be the quickest way to check the carb.
Pour a little fuel mix in the plug hole and try for start--if pops several times, you have a fuel delivery problem. Check for a plugged fuel filter, air filter, and muffler. Check the condition of the fuel lines, particularly the line ends. Make sure the carburetor fasteners are tight. Does the primer bulb fill with fuel when pumped? Hope this helps!
Go to: http://www.drystacked com for a 12 page article on Walbro carburetor theory and troubleshooting. Check particularly, the position of the gasket in the lower chamber. Check the spark plug for blue, snappy spark when the engine is hot. If ok, place a small amount of fuel mix in the cylinder and try for start. If it pops several times, look to the fuel system. Check the fuel filter, air filter, and muffler for plugging. Does the primer bulb fill with fuel after several pumps? Check the fuel lines for decay or other damage. When the engine is hot, try not using the choke, but set the fast idle. Hope some of this helps!
When you replaced the spark plug, did the plug show a snappy, blue spark when the engine was pulled through smartly? If it did, check for a plugged fuel filter, air cleaner, and muffler. Check the fuel lines for condition. Make sure the carburetor fasteners are tight. Does the primer pull fuel into it? Is the fuel mix fresh? If still nothing, try spraying some starting fluid into the cylinder through the plug hole and pull through. If pops several times, the carburetor may need to be disassembled, cleaned and adjusted. Hope this helps!
Take the wire of the spark plug,and see if it shocks you when the cord is pulled.If not there may be something wrong with your coil.(loose wire for example)If it does shock you,you may want to check out your piston rings,or the little air/fuel mixture valve between your carburetor,and cylinder.