![]() See “carburetor” on how to adjust these settings. Readjust your carburetor settings to prevent the engine from running rich, causing the same problem to occur. ![]() Reapply the tension by turning the adjusting nut clockwise until it stops. Reattach the belt around the blade pulley by walking it back on the pulley. Put the water line back on the saw, followed by the blade assembly. Install the new, or cleaned muffler, back in the engine. Shake it – if you hear any noise or rust particles are falling out, then replace it. If it appears to run fine without the muffler, try cleaning out the old muffler with carburetor cleaner and dry it with compressed air. Walk the belt off the saw pulley and then remove the blade assembly. Take out the water line by turning the saw on its side to access the bolt. Release the tension on the belt by turning the adjusting bolt counter clockwise until it stops. To remove and check the muffler, start by removing the recoil and then take off the belt cover on the blade side. This will build up inside the muffler and prevent it from running as it slowly chokes off the flow of exhaust, backing it up in the engine. If the engine is running rich, it will create black, sooty smoke. The muffler silences the noise made by the internal combustion engine. Clean out the carburetor with carburetor cleaner as they can easily become gummed up in a two-stroke engine. Some carburetors are fixed, meaning they have no adjustments. Most will start and run with both screws open two turns.ĭo not close off the high speed any more than necessary, no matter how well it turns. Also, make sure the oil/fuel is mixed at the proper ratio. Next, put a load on it and tweak the settings, just a tiny bit at a time. This setting of backing it out will allow more fuel when under a load and keep your two-cycle motor from running too lean. Next, play with the high speed needle, but always back it out from the setting – about ¼ turn or so – from where it runs the smoothest. Keep playing with the low speed needle until you get a rapid, immediate response from the throttle and a good idle with the idle adjustment. Turn it back in midway between these two positions. Then, back this out until it starts to run rough or slows down. Next, hold the throttle wide open and slowly turn in the high speed, until it really starts to smooth out, rev high, and starts screaming. Slowly turn in the low speed jet, until it starts to die, then back it out another ¼ or ½ turn. You may have to keep the throttle open a bit, allowing the engine to keep running. Start the engine, allowing it to warm up for five minutes. One should be idle mix and the other high speed. ![]() To adjust the carburetor, start with both screws backed out two turns from the closed position. Check that the linkage is not bent out of shape, impacting operation of the carburetor. ![]() If the cable is stretched, replace it by disconnecting it at both ends and installing a new one. If the choke comes off too soon, it will cause the engine to die. The choke should be closed for start up and for the first few minutes, as the engine warms up. Take out the air cleaner housing and filter. Remove any covers necessary to gain access to the carburetor. Locate the carburetor underneath the air filter. If the settings become unadjusted, you will need to reset them in order to keep the engine running after it starts. The carburetor is designed to mix fuel and air in the proper mixture for combustion.
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