Question about Troy-Bilt Mtd Troy Bilt TB4218CC 42cc 2 cycle Gas Engine 18" Chain Saw
The idle screw may be turned all the way in on the carb adjuster which should be a very small screw in a 3/16 hole through the plastic cover on the side between the starter rope and the trigger on most saws. Bottom it out and then turn it back 1 and 1/2 turns. Have the saw on a low bench, so you can control it when she starts up - if the revs are too high the chain will spin up which can be dangerous. Now screw the idle down until the chain stops and the motor starts to stall, screw it out a little to get a running idle which will not stall but never starts the chain spinning up. Some have two screws, one for air during idle, the other for the gas during idle. They both should be out about one and a half turns which is industry standard and then you can fine tune from there, but usually only a half turn cw or ccw would be way too much difference from the standard positions.
Posted on Apr 11, 2011
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Posted on Jan 02, 2017
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