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I have a McCullogh 3200 32cc chainsaw that will only run on half choke for a few seconds then shuts off then has to be started again on full choke only to do the same thing again.

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6ya6ya
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Posted on Jan 02, 2017

picatudo
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SOURCE: runs for a few seconds then stops

there are two screws on the carburator one is for air other for gas .that need ajusment

Posted on Dec 31, 2008

  • 1 Answer

SOURCE: spear and jackson chainsaw. runs

OK - let's work through this. If you need choke all the time then the mixture is too weak when the choke is off. Putting the choke on literally chokes off the air supply to the engine by lowering a small shutter across the entrance to the carburettor. That means either there is too much air getting to the engine (don't see how!!) or too little fuel. So, how do we get too little fuel? You could check for this as follows;
- before we do anything tricky let's check the obvious things - is there a fresh fuel mix in the tank? Petrol does go off, especially if there is 2 -stroke oil added to it. If it's over a month old from the pump mix up a fresh batch. Is the idle speed set too low so the engine stalls when the choke is knocked off? You can see this screw to one side of the carburettor (you need to remove the top lid in front of the handle on the chain saw, and then remove the air filter to see it). Turn the screw half a turn clockwise to speed the engine up. Be warned - if the engine starts it will run faster than normal and that means the chain may start to spin around. Also - check that the chain brake is off (i.e. the safety lever is pulled backwards, and that the chain is free to move BEFORE you attempt to start)
- is the fuel filter blocked? To get to this, make a wire hook (e.g. thick fuse wire) and gently hook out the fuel filter that's sitting at the bottom of the fuel tank, and take a look at it (be gentle - you can damage the gauze if you are clumsy). Does the gauze look clear? I.e. if you dip it into petrol it will freely run into the filter and of course drain out when you lift it? If not, replace it.
- next stop - are the jets in the carburettor set right? I don't have a service manual for this (and I know the manual says unhelpfully "return for service") but basically you will have seen two holes on the side of the chain saw (below the handle) two small 0.8cm holes; one marked 'L' (for low speed) and the other 'H' (for high). Put a fine flat screwdriver down the L hole and feel for the slot of the low speed jet. Once engaged turn it out half a turn and this will enrich the mixture - if this seems to help and you can start the engine then adjust the L jet in or out until the engine is idling comfortably. If it idles too quickly then you can also turn down the idle screw (see previous paragraph).
- no luck still? Well, it could be fuel pump or a blocked jet in the carburettor but this really is a 'return to the service centre' task!

Good luck!

Posted on Jan 12, 2009

  • 109 Answers

SOURCE: i have a stihl 021 chainsaw that will crank and

For the 021...on the muffler, there is a spark arresting screen, this is to prevent sparks from coming out of the muffler. It is common for this screen to become clogged with carbon from the engine. You will need to clean/replace this screen in order for it to run correctly.

Posted on Apr 21, 2009

  • 246 Answers

SOURCE: chainsaw starts and runs fine for a few minutes

Try fresh fuel making sure oil and gas mixture is correct. Carb might need cleaning and adjustment.

Posted on Jul 26, 2009

  • 4088 Answers

SOURCE: Homelite chainsaw won't stay running

Make sure you are using fresh fuel mix (50:1 ratio). Don't use boat motor oil in a saw--only modern synthetics made for saws. Always premix the oil and fuel thoroughly before adding to the saw. Check the fuel filter for plugging and the condition of all fuel lines, plus the primer bulb condition. Check all carburetor fasteners for tightness. Make sure the air filter and muffler are not plugged. If still no help, you may need to service the carburetor. For an excellent article on Walbro carburetors, go to: http://www.drystacked.com Pay particular attention to the placement of the lower diaphragm and the cover gasket--interchanging positions of them cause many headaches. Adjustment of the two jet screws require a special 'D' screwdriver which may necessitate a trip to a servicing dealer for adjustment. Hope this helps!

Posted on May 04, 2010

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I was using my o17 saw today it was runing Just fine I shut it off when I went to start it again it fired on choke seting after that I could not get it to do anything what is wrong with it


All 2-strokes love to run rich when cold thus full choke till it kicks, half choke to start and leave on for 5 seconds high rev's to warm & lubricate, then no choke to run. Restart when hot is 1 pull full choke (you are now flooded) & then no choke til it starts. Try it. Works every time on all of my 2-stroke engines.

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4. pull starting cord till it fires
5. place choke to one half full
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Full choke until it tries to start, half choke until it does, and once it's running, open the choke fully and wait a few seconds for it to warm up before using it, as well as 15-20 seconds to let it cool down before shutting it off so as not to warp any metal parts of the engine

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Check your fuel filter in case it is clogged. When starting pull cord on full choke 5 times quickly. Wait 2 or 3 seconds...try again if it asks like it wants to start..then put on 1/2 choke...goes thru same process. Check spark plug.

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I have a poulin pro 220 chainsaw. I just replaced the primerbulb and the only way it stays running is if the choke is fully on. If you put the choke to half or off it runs for a few seconds then dies


Check and see if the fuel line is collapsing when you start. The wonderful gas that we have contains alcohol which deteriorates rubber. Gas lines and many carburetor parts are eaten up by this gas. When you go to start your saw it has enough to run but the suction from the carburetor collapses the fuel line, weakened from the alcohol, not allowing any more fuel to pass. When the suction stops, when the saw shut off, the fuel opens up again allowing you to start it again. I had this problem when the government forced this crappy gas on us in the late eighties and I had to carry extra spare parts for my saws because of these problems. Anyways enough ranting, try and change the fuel line and that would most likely be your problem. If it is an old saw it might have done damage to your carburetor and it will need a carburetor kit/rebuild which is not usually too expensive. Hope this helped.

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more information please..

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4. Pull saw over until it fires once.
5. click 'on' switch up one position to 'half choke'
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Don't prime it 6 times.

Prime it once and try starting. Keep trying with one prime.

If that doesn't work, let it sit for a bit. And then prime it two times and try starting again.

If that doesn't work, try priming 3 times.

Then try half-choke with one pull only, and then move choke to run for the second pull.

The saw might have an on-off button

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