Question about Poulan Pro Chain Saw 46cc 20"

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Chainsaw cranks but wont run,new plug, filter and fuel filter.less than two years old

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Take the spark plug out (gapped 0.020") and test for spark--it should be blue and snappy. If ok, pour a little fuel mix into the plug hole and try for start--if pops several times, then you have fuel delivery problems. If none/weak spark, then remove the starter assembly and side cover over the flywheel. This will expose the ignition module--set the pole gap using a thin business card for a gauge. Turn the flywheel so that the magnets are under the module poles, insert the gauge, loosen the module screws and allow to contact the magnets. Recheck for spark--if still bad, replace the module. Back to the fuel delivery problems. Check the fuel lines for decay or other damage. Make sure the carburetor fasteners are tight. Hope some of this helps!

Posted on Sep 13, 2010


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Check the gap between the magneto and the magnet on the flywheel, if it is too much of a gap you wont get spark. We are talking .007 inches or less. You need a feeler gauge to set this

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My 2000 Oldsmobile Alero will turn over but wont start...any solutions to this problem? I did recently replace the crankshaft position sensor.

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My saw is less then one year old. The saw will not start, it has a new spark plug fresh gas. The saw was running fine and just sputered and cut out.

You need four main things for the saw to start, good compression ( remove the muffler and check the condition of the piston through the open exhaust port, look for signs of scuffing on the piston skirt ), a spark at the plug ( remove the plug, place it ontop of the cylinder, or a good earth, crank the engine and check for a spark ), a spark at the correct time ( remove the flywheel and check the key has not sheared, check the air gap between the flywheel and the ignition unit, this should be 0.3mm ), fresh fuel at the plug ( when you remove the plug, is there signs of fuel on the plug electrode, if not there is a fuel blockage, check the fuel filter in the tank, check the fuel hoses for signs of leakage, or cracks )

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1 Answer

Hi , I am trying to restore a thirty year old chainsaw, but I believe the carburettor may have a fault, is it possible to 'see' fuel leave the carburettor when cranking or turning the piston? It looks very...

Sorry i do not understand the question, if the is an all position pump carb you will not be able to see fuel passing through the carb, you should see fuel at the spark plug ( plug getting wet ) pump carbs will have a pump, and a metering diaphram, they should both be supple and show no signs of cracking or blistering, there will also be an impulse from the cylinder, or crankcase, this needs to be clear or the pump will not pull fuel from the tank, at thirty years old it may well have contact breaker ignition, if it does you need a good blue spark at the plug for it to run, try dripping some fuel straight down the air filter elbow if it fires up for a short period ( until the fuel has gone ) the spark is ok and it is a fuel issue. Old saws suffer with stale fuel attacking fuel hoses, fuel filters, and diaphrams, so it may well be a case of replacing all these components. Swill the tank out well to get rid of any stale fuel from the tank.

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1 Answer

My poulan chainsaw will start and run but immediately cuts off when i touch the trigger. i drained and refilled with new fuel, cleaned and re-gaped the spark plug, cleaned air filter and carburetor, and...

One thing you might check is the vent on the gas cap to make sure it is not plugged. I have had them plug tight and not allow fuel to be draw on accelleration. Hope this helps you. Thank you.

Feb 05, 2011 | Garden

1 Answer

Has been sitting for a few years.. cleaned carb and chedcked settings on H and L screws.. still wont start.. replaced fuel lines and primer bulb.. and its a mac 3227 weedeater.. cranks but doesnt start,...

siphon out the old fuel and put brand new fuel in the tank. Change the air filter even if it looks ok. Put in a new spark plug. Then get a can of starter fluid and an assistant. Squirt some starter fluid into the air intake and start it up. have your assistant continue to spray the starter fluid for a minute or so until it runs on its own. J.

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Kieran Tursner

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1 Answer

Old homelite chainsaw, wont pull fuel

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Chainsaw carburetion

Hi regards savumihai71

I think there is a carburation problem.Take the carburator,carefully disassembly and clean it.Near the needle there is a round tehnological cover from alluminium.Take it off some way (a new one is needed).In that hole there are some small holes ,make conections with Venturi wall from carb(also small holes),Clean them.Assembly the carb,check the air filter andthe fuel filter.

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