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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remove the plug, hold the throttle wide open and pull about 10 times
replace the plug and hold the throttle wide open, pull to start
the stihl floods very easy and will not start until the excess in the crankcase is removed
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.
Connect a fuel pressure gauge to the fuel line and check the fuel pressure. If it exceeds manufacturers specifications; replace the fuel pressure regulator. Spark plug cables which have aged, and now have more han 1,000 ohms resistance per inch of length, also can lead to cylinder flooding; and should be replaced.
Check to see if you have spark. Put a plug in the cap and touch the cylinder , kick it over to see if the plug is sparking. I kick mine 2 or 3 times to prime the cylinder holding decompression lever in. If it pops on full choke but does not start I go to half choke. If it does not start after 3 or 4 kicks , then I turn off the choke and kick it over 5 or 6 times with the decompression lever pulled to clear it. Then I will kick with no choke or half choke. Honda's are notorious for being cold blooded so when it starts let it warm up and do not be afraid to drive a short distance on half choke till the motor warms up a little. When the machine is hard to start after sitting I usually start by removing the carburetor and shooting carburetor cleaner through the jets and passageways.I have always found my 96 xr400 to be a dependable starter with fresh gas and a clean carburetor. If it is flooded use the decompression lever to clear the cylinder.
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!
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.