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Be careful with primerbulb especially if use alkylat fuel for a fuel surplus some times remove the sparkplug and holding the mufler in down to the ground position so to release the surplus out of the machine , if that is not working after replace sparkplug and starting , then you can have a problem with compression but first the spark of your machine must be colored white/blue and not red. if thats also good then remove the muffler and look on the exhaustside of your piston if there are grooves on then you know whats wrong in the fastest time if that is not that it looks smooth like a mirror then seals on the crankshaft , tankairiation good ? gasket(s)carburetor and cilinder underside .
When I find it hard to start a saw, lawnmower etc what I do is:
Remove the sparkplug
Pour about 5ml (one teaspoonful) of fuel into the opening where the sparkplug came out of
Dip the end of the sparkplug in the fuel so the spark gap gets wet
Replace the plug and try to start the saw
The fuel you poured in should ignite and cause the saw to start until it has burned that amount of fuel anyway. Sometimes that's enough to get the saw going. If not repeat the procedure 2 to 3 times. Don't be tempted to put too much fuel in or it will flood.
If the saw was left away with fuel in the carburettor for a few months it's possible that gel has formed in the jets which block the fuel getting through. If this is the case and the above procedure didn't work the only other option is to get a mechanic to strip down the carburettor and clean the jets.
check the compression,ignition sistem ,carburator and fuel lines (is there any spark,is the spark bright blue,does the fuel reaches the sparkplug.try put some small amount of gas inside the cilinder to seee if the engine starts and run.
Ok first off drain all fuel out of the saw replace the fuel tank filter, then clean out the air cleaner, pull the spark plug out and with some and paper sand the spark plug so that it's clean. NEXT mix some new gas mix and add to the tank try putting the choke on full and pull rope about a dozen times then put choke in partial open and try starting. If it does not start pull spark plug and pull starter rope and see if you have spark if you do add a capfull of gas mix into the spark plug hole and tighten the spark plug down and try pull starting if it fires off and dies then you have a cracked fuel line and need to replace the fuel line. When you have the plug out spray a small amount of WD 40 into the sparkplug hole and pull the rope a few times to get rings lubracated then add the gas. If it won't start post here and I will give you more directions to test for starting again. HOPE THIS HELPS AND THANKS FOR USING FIX-YA.
these are the main things that you need to do. Put a new sparkplug in it. Make sure the air filter is really clean. Set both the low and high speed jets out 1 1/2 turns. Snake the fuel filter out of the gas tank with a hooked wire and clean the filter on the end of the line. If none of this helps then you more than likely have a bad diapragm in the carb. and you will have to get a rebuild kit and install it. Hope this helps you. Jeepfxr
if your saw didnt lock up ,or overheat it should run again, take out spark plug, with switch off, put your thumb over the hole and check for compression when you pull the cord. if it pops your finger off the hole you probably didnt cook the rings, or burnt the piston, the raw gas may have washed the cylinder down enough to temporarily lose compression (lack of oil seal). refill tank with proper gas/oil mix, squirt a small amount of oil in cylinder and pull it thru a few times , this should seal up the rings again , put in a new sparkplug, and try normal cold start, you may have to clean the plug a couple times before it runs. if it runs but lacks power my guess is the rings got to hot and lost their temper or scored the cylinder. dont use alcohol blended gas this will ruin fuel lines , they soften up and fall apart etc. premium regular if you can get it, check the fuel line to be safe for pinholes as they will **** air and not start if you get alcohol blended gas. anyway good luck. geo_1