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Tool Talk Discussion Forum

chainsaw pull-cord breaks

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Gobind

06-08-2006 05:47:27




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I've got a Poulan Pro 18" chainsaw that ran great out of the box. It's starting to bog down a little lately. Related or not to needing a tuneup, the pull-cord has broken twice. The stress on the cord seems to come when the engine shuts off.

Any ideas on what's causing this and what can be done?




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Bob M

06-08-2006 09:23:03




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 Re: chainsaw pull-cord breaks in reply to Gobind, 06-08-2006 05:47:27  
Bogging down under load can be the high speed mixture is set a bit lean. Might also be dirty fuel pickup or carbon buildup on the spark arrestor and cylinder exhaust port.

Not at all unusual for a chainsaw (or any 2 stroke motor...) crankshaft to rotate backward 1/2 turn or so upon shut down. Depending on the starter rachet design the backward rotation may catch the rewind and stress the starter rope in the process. I deal with it by pulling the starter handle out a few inches and holding it loosely before hitting the kill switch. The reverse rotation then pulls the rope back in without stretching/breaking it.

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dave

06-08-2006 07:49:48




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 Re: chainsaw pull-cord breaks in reply to Gobind, 06-08-2006 05:47:27  
probably hot carbon firing it before tdc,causing kickback.I have seen alot of bad coils fire out of time too.replaced a lot of poulan coils that still worked but not correctly.Hope this gives you some help.btw the bog down could also be a stopped up muffler screen.they are bad for that too when they get some time on them.good luck



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nballen

06-08-2006 07:15:32




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 Re: chainsaw pull-cord breaks in reply to Gobind, 06-08-2006 05:47:27  
Please explain what you mean by "The stress on the cord seems to come when the engine shuts off"?

On a recoil starter, there are a couple of "dogs" that grip notches on the cord pulley. These are set so that the running engine does not engage the dogs, but you pulling on the rope will engage the dogs. Shutting down the engine should not stress the cord (but then, you knew that).

A few more questions - How old is the saw? How do you store the saw? What type of rope do you used for the pull cord?

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Butch(OH)

06-08-2006 12:43:31




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 Re: chainsaw pull-cord breaks in reply to nballen, 06-08-2006 07:15:32  
Sure shutting down stresses the cord, probably more than anythingf else other than yanking it to the end when starting. Doubt it? Pull the handle up a few inches and hold it with two fingers next time you shut your saw off and watch as it yank the handle right out of your hand. The manual thatcame with my old 610 Mac said to prolong starter life do exactly that, pull it up and let the cord be pulled out of your hand when shut down. I developed a habit of it that has lasted to this day and its been a few years since I ran that Mac.

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jeffcat

06-08-2006 17:43:55




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 Re: chainsaw pull-cord breaks in reply to Butch(OH), 06-08-2006 12:43:31  
I am so glad to see someone that reads the book!!!!! Another thing is if you are useing a crappy oil/fuel mix. Also too lean on the high speed screw. The saw must be HOT and it must be UNDER LOAD to adjust it. You turn the screw counter clock wise till the saw just starts to run a little rough. This is while you are cutting a log!@!!~!! You can not set the high speed correctly by just jazzin the throttle!!!!! You should try and set up an old Mall or an old Disston KB7 with out havin it in a log! Just goin a little crazy to night. Jeffcat

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Gobind

06-08-2006 08:02:47




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 Re: chainsaw pull-cord breaks in reply to nballen, 06-08-2006 07:15:32  
I should have been more precise. It's when the engine shuts down by itself with the switch still on, for example when turning the saw upright after a horizontal cut, that I believe it is jerking on the cord.
The saw is about a year old, I've just used generic replacement pull-cords.



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