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Chainsaw runs w choke speed up, cuts off when choke is off

Chainsaw troubleshooting .....mine runs with choke on but speeds up and cuts off when i take choke off......

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If your saw runs with choke on or half on but won't run with your choke off there are a few things you can do to see if they work. Check the air cleaner, clean it with soap and water and allow it to be completely dry before installing it on the saw. 2nd check the spark plug for fouling, take it out after the saw has stalled, if it is wet, it is getting fuel, if it is dry it might not be getting enough fuel. 3rd In the gas tank take a pair of needle nose pliers and carefully pull the gas line out, you need to move it around inside the tank until you can get ahold of the end of the gas line that will have a small barrel shaped fuel filter on it. Take a close look at the small filter and make sure it will the gas flow through it. you can give it a shot of compressed air to clean it or replace it if it is plugged. While you are at it check the small fuel lines, they are a clear gas line and can become very soft and fall a part or very brittle and break, if either of those issues are present replace the fuel lines with new line, very inexpensive but be sure to take a small piece with you to match it up. Also check the primer bulb if it has one for any leaks by depressing it and listening for air leaks. 4th, take your recoil pull start off and set it aside, you will have access to the flywheel. it will have magnetic pickups on it, turn it by hand and when the magnetic part of the flywheel is exposed clean it off with some brake cleaner or carb cleaner.Be sure there are no metal filings or dirt, grime oil on the magnetic pickup and reassemble by installing the recoil pull cord housing..
When you have the spark plug out, rest it in the hole and pull the strat cord, while you pull on the cord be sure to look at the end of the spark plug, you should see a blue white or blue yellow spark, if you do not get someone to help and hold the spark plug wire with well insulated pliers, holding the end of the spark plug against metal on the cylinder, you should see spark when you helper pulls the cord. Be sure the on off switch is in the on position when checking for spark. 5th The muffler will have a spark arrestor in it, they can plug with emissions from the exhaust and it will need to be cleaned and free of any build up. Last I would suggest checking the small screws that holds the carburetor together, be sure they are snug and no play..The only other things it might be is it has a torn diaphragm in the carb and will need a carb kit, or you have damage to you piston and cylinder causing a loss of compression.. Good luck, and be careful.

Posted on Jan 29, 2015

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There may be a number of errors in the saw, or one of several.
If you have lots of used chainsaw or chainsaw has stood for a long time. Then the problem can be broken crankshaft seal.
Another possible problem is - improperly installed or defective carburetor gasket.

Posted on Apr 03, 2014

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Posted on Jan 02, 2017

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SOURCE: my hoomelite chainsaw bogs down when i go to cut wood

Would check sprocket teeth as sprocket is probably worn out. Causing drag of chain.

Posted on Apr 12, 2009

dontbother10
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SOURCE: chainsaw will not run once you take the choke

Stihls often have a problem with plugged up mufflers. Remove and clean it. Do not forget the spark arrestor screen. GL
Lou

Posted on Jan 20, 2010

dontbother10
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SOURCE: My echo cs440 all of a sudden stopped running at

That is where I would go. Maybe carb clean or kit if it is a sudden change.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.

If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

Posted on Mar 01, 2010

mark24354
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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

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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

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1 Answer

Why does it run only with the throttle in choke position?


Hi John:
Sounds like it's too lean.
Try backing out the high speed screw 1/2 turn at a time until you don't need the choke. Then tune the high speed with saw running at full throttle. Screw in (lean) until RPM starts to drop, then back out 1/3 to 1/2 turn. Then set low speed at idle so engine is smooth but chain does not turn.

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Denise,
Check to see if the boot between the carbureator and the engine has a crack in it, if it is cracked air will leak in causing a lean mixture and hard starting. Also will not run unless the choke is on.

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You are probably running it too rich. Try leaning out the high speed jet a little. That's the one closest to the air filter. Out to the left, in to the right. Out richens, in leans. Too lean = cooked piston, so be careful. If you really screw it up, take it to a STIHL dealer.

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1 Answer

Poulan 45cc chainsaw will start running with starting with choke, but will not stay running.


Sounds like the low speed fuel adjustment is out of whack....you can reset it by turning it in all the way clockwise...then as a starting point, turn it out 1 and 1/2 times, start the engine and slowly adjust the screw until the engine starts to choke out..when this occurs, turn it back in until it starts to choke again...then you need to set it somewhere in between to find the "happy medium"....thew high speed screw is adjusted after you get the engine idling properly...if you haven't messed with this then I wouldn't worry about it..unless you have poor high speed operation, then you will need to set the high speed screw...the object here is to obtain the best low to high speed throttle...if , when you throttle up the saw, the engine bogs or goes to high speed slowly , here is where you adjust to get the best throttle response...use small increments until you achieve the desired response

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1 Answer

My chainsaw starts with choke when choke is off and i press trigger it just dies like its getting no fuel


Check the fuel filter, muffler, and air cleaner for plugging. Check the condition of the fuel lines for hardness, splitting, end rot, or kinking. Make sure the carburetor fasteners are tight. If no help, remove the lower carburetor chamber cover and examine the diaphragm and fuel metering valve that it controls. The diaphragm should not be hard, cracked or have any holes. The fuel valve has a rubber tip that may have deteriorated. If looks ok, then turn both L and H jet needles CW to stops (lightly), then back out CCW 1-1/2 turns each. Engine should start and run with these basic settings. Allow the engine to warm up, then pull the throttle full on. Adjust H needle CW until the engine speeds up somewhat, but is 4-stroking. Correct adjustment is when the engine continues to 4-stroke, but immediately 2-strokes when cutting. Allow to idle, and adjust L CW until the engine runs fairly well, but will allow the engine to 'follow the throttle'. Set idle speed screw so that the chain stops moving, but the engine continues to run. Hope this helps!

May 17, 2010 | Garden

1 Answer

I have a poulan pro pp4620avhd chainsaw. I can get it to start and stay running as long as I have the choke on. I can even run it at high speed using the choke control. When I pull the trigger to feed it...


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!

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1 Answer

Setting carb on homelite chainsaw


Make sure that the air cleaner is not choked with sawdust. Turn both H and L jet screws CW to stops (lightly) then back out each 1-1/2 turns CCW. Start the engine and allow to warm up. Pull the throttle full on and adjust H CW so that the engine will speed-up somewhat, but still 4-stroking. Proper final adjustment is to be 4-stroking, but immediately 2-stroke when cutting. Allow to idle and adjust L so that the engine runs fairly smoothly, but will allow the engine to 'follow the throttle'. Set idle speed screw so that the chain doesn't move, but the engine keeps running. Hope this helps!

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3 Answers

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!

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