A chain saw is a gasoline-powered engine which drives a sprocket which drives a chain around a long bar.However, if it doesnt start or run smoothly, there are basic things to check before you head to the repair shop.Make sure the McCulloch chain saw has fresh fuel, at least half a tank.Test the chain brake, in front of the saws top handle, to be sure it is not engaged to lock the chain.Test the chain to see that it moves freely, is not binding in the bar and is properly adjusted for tension; a bar that is binding or is too loose or too tight will interfere with saw operation.
Then check the spark plug to make sure it is not fouled; clean or replace it. Examine the spark arrestor screen in the muffler; clean it with a wire brush or replace it. ![]() Turn it clockwise to increase idle speed, counterclockwise to decrease; at perfect idle, the engine will run smoothly but the chain will not move. If the engine smokes, the fuel has too much oil; empty the tank and replace with a proper gasolineoil mixture. ![]() Haring holds a Bachelor of Journalism from the University of Missouri.
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