Question about Poulan Pro 42CC 2 Cycle Chainsaw, 18"

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Starts then dies

Starts with choke out but then it stops running. It seems that it is dumping to much fuel. Spark plug then gets to much fuel

Posted by Anonymous on

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 4088 Answers

SOURCE: poulan saw wont run

Clean the muffler spark arrestor screen and check the cylinder port for carbon build-up at the upper edge. Try presetting both carburetor H and L adjustments (from lightly CW stops) 1-1/2 turns CCW each. Start the engine and allow to warm up. Pull the throttle wide open and adjust H CW until the engine speed increases, but still 4-stroking. Correct setting is when the engine 4-strokes, but immediately 2-strokes when cutting. Allow to idle and adjust L for smoother running, yet allows the engine to 'follow the throttle'. Set idle speed to keep the engine running, but doesn't try to move the chain. You may have to look closer at your carburetor if the above doesn't help. Go to:
http://www.drystacked.com
for an excellent article (but poor pix) on Walbro carburetors, but related to most all 2-stroke carburetors. Hope this helps!

Posted on Feb 24, 2010

mark24354
  • 776 Answers

SOURCE: I have a poulan pro pp4620avhd chainsaw. I can get

The best thing you can do to these engines it take them completely apart - take piston out and everything. Believe it or not, my 12-year-old son was able to do it - very few parts in these little 2-stroke engines. He polished the carbon off of the piston with a drummel tool and cleaned everything with carb-cleaner. Put it back together and it ran like a champ. Still does. It was a great learning experience for him too. The worst that can happen is you have a bunch of parts that you will throw away.

Posted on Mar 19, 2010

  • 4088 Answers

SOURCE: I have a poulan pro pp4620avhd chainsaw. I can get

Check the fuel filter and muffler for plugging. Check the fuel lines for condition. Check the carburetor fasteners for tightness. If the saw has a lot of hours, remove the lower section of the carburetor and check the condition of the diaphragm--it should not be hard/cracked. If everything seems to check out ok, Turn both jet screws CW to stops (lightly), then CCW each 1-1/2 turns. The engine should start and run--allow the engine to warm up. Pull the throttle full on and adjust H needle CW til the engine speeds up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Let idle and adjust L CW so that the engine runs fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

Posted on May 14, 2010

  • 248 Answers

SOURCE: Poulan pro 4218 avl, starts (sometimes) then dies,

may be choke problem,about 20.00 for repairman to fix

Posted on Oct 08, 2010

  • 4088 Answers

SOURCE: poulan pro 42cc starts when

Check the fuel filter, air cleaner, and muffler for plugging. Inspect the fuel lines for decay or other damage. If no help, remove the carburetor, disassemble and clean the interior with spray carburetor cleaner. Check the condition of the diaphragm in the lower chamber--it should be flexible with no holes or cracks. Also check the small needle valve that the diaphragm controls. Check the crankcase impulse passage behind the carburetor for gasket failure or other damage. This passage pulse-pumps additional fuel into the carburetor as it runs. Hope this helps!

Posted on Jan 15, 2011

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I had a similar problem once with my Honda CX500. I found the connections to the ignition module had gone green and a good clean up restored normal running.

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I would hook up the timing light and remove the screens from in front of the carbs and go for a ride- using the timing light as a flashlight to look down each carb and see what is going on. It's kind of like a stop action movie and will let you identify if the choke is stuck (closed) or you have a flooding carb dumping lots of fuel into one cylinder -- which is then moved around to the whole engine via the puddle trap system.

The choke is applied when the key switch is pushed in while the engine is turning over. If you have a fuel enrichment system in stead of a choke, it will have a red lever on it so you can run it manually. Somebody may have turned it on. Either way you should be able to hear it "click" when you push the key switch in and release.

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take off the muffler and try it if ok then open it up and clean the carbon from the screen

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First, you need to dump all of the fuel out of the gas tank, Preferrably into a gas container. If you know how much oil you dumped in, you can calculate how much more gas to add. You could also just dump the gas, re-mix some new gas and oil, whichever you prefer.

If you are comfortable doing this, remove the fuel lines going to the carberator and let them drain into a pan. Pump the fuel primer to purge the gas out of the carburator, and then re-install the fuel lines. This might help you get it started a little faster, but its not necessary. You can burn the old gas in the engine at it will be fine.

Next, remove and replace the spark plug. Its probably fowled out with too much oil. Keep a can of carb cleaner and a small wire brush handy, you may need to clean the spark plug a couple times. If it gets too dirty, you can replace the spark plug with a new one. Do not burn Carb Cleaner in your engine for long periods of time, it will damage the engine.

After you have installed the spark plug and put some correctly mixed gas in the tank, Try to start the engine again. There will be some residual fuel in the fuel lines going to the carberator, so you will need to burn off that gas.

If you can't get it to start, try these steps:
Choke off, throttle wide open, crank several times. (or let it sit in the sun for a couple hours) (this corrects flooding)
Prime carberatur, Choke full on, throddle idle position, crank until it fires once but does not start.
Choke half, crank until it fires again or starts.
If it starts skip this step: (Choke off, crank until it starts).
Keep the choke on half for about 10 seconds and let it idle.
Put the choke off and let the engine warm up for a couple minutes.
After warmup, test the throttle to see if it will run at full throttle (it may take some fluttering until the engine is fully warmed up)

Let the engine run at full throttle for a few minutes. The exhaust may be a little more blue-smokey than normal...this is the excess oil burning...totally normal and harmless.

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Our mini-Mac saw seems to require some fiddling with the choke as it doesn't have a primer button, but once it starts firing, the choke can be opened fully after a moment or so. Check the fuel filter, air filter, and muffler for plugging. Check the fuel line for decay or other problems. Make sure the carburetor fasteners are tight. Check the spark plug for blue, snappy spark (gapped at 0.020"). Hope this helps!

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Wont run without choke being pulled out 1/4 .


INFO:
-Remove Carb and clean, you have a high speed fuel port clogged.

NOTE:
This would also be a good time to replace your fuel lines, Take photos before you start.

RECOMENDATIONS:
-Drain all fuel from the Saws fuel tank.
-Remove and REPLACE with a NEW spark plug.
-Remove and RELPACE with a NEW Air filter.
-With spark plug and air filter removed and fuel drained pull the starting cord many times 12 or so to ensure there is no fuel in the chamber and also check for a spark at the plug.
-RE-MIX WITH NEW FUEL your 2 cycle oil to the correct ratio in a clean fuel can. it is OK to dump some in the Saws fuel tank slosh around and dump out in an approved container for disposal.
-Hold off on putting back on the air filter until you have had it running.

Hope this Tip Helps.

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Give lots of details when describing the problem. When it started, was the choke on? If the choke is on, try starting it with the choke off, or starting it with the choke on and immediately taking the choke off when it starts, but keeping your fingers on the choke so you can turn it on again if the motor begins to die. As others have described, you have a problem with the mixture screws not being set right or the carb diaphram being damaged. Your owners manual may tell you what settings to start with on the mixture screws, or you may be able to google the model number and get the manual online if you don't have one. At this point you should have taken the carb apart to look for problems and blow out the air and fuel passages. You are making progress. At least you know that it is getting spark, and getting gas. I am not familiar with that model, but many of them have three settings for the choke, fully on, half on, and completely off. If you have that type, after it starts and dies, take out the plug and dry it, then try starting it with the choke half on. You will need to clear out the excess gas while you have the plug out.

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