Craftsman Chainsaw won't idle


Old 01-16-09, 07:03 PM
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Craftsman Chainsaw won't idle

I have a Craftsman chainsaw that I can't keep running at idle. It dies instantly when i let off the throttle, or i can bump the throttle down to an idle but it only runs for a few more seconds before dying. I've changed the air filter, plug, gas mix, and diaphram; and checked the fuel lines and filter. They seem fine. It has a Walbro Wt-120 carb. I tried adjusting the low speed idle, but that didn't make much difference. Can anyone give me some ideas on what to try next?
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Old 01-16-09, 09:22 PM
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You said you adjusted the low speed idle. I am assuming that means the idle speed screw? It sounds like you might want to open up the low speed mixture screw a little.
Old 01-17-09, 07:02 AM
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At the Walbro link below you can download a manual for your carburetor. In addition to the "WT" manual get the "Diaphragm Carburetors" manual.

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Old 01-19-09, 07:12 PM
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Looks like I just needed to do alittle more adjusting. Thanks for your help, guys.
Old 01-23-09, 09:41 AM
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make sure the exhaust port/spark arrestor isnt clogged with sawdust etc. too much back pressure will make them not idle

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