An extremely lean adjustment will cause the engine to die, too.
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It would not be accurate to say that this is the most important setting, because all of these adjustments need to be accurate for a saw to perform its best, but this is the adjustment that determines how the saw runs in the cut. An adjustment that is set too rich will not allow the saw to reach the RPM level necessary to build maximum power.
Throttle response may also be sluggish and the engine would smoke and perform poorly. A mixture that is too lean will allow the engine to reach an RPM level where bearing failure and cylinder seizure are likely.
It will also lack power in the cut and tend to run very hot. The preceding information briefly explains rich and lean running conditions. It also identifies the three adjustment screws and their function. It should be noted that some chain saws lack the high speed adjustment needle. Unfortunately, they also often prohibit the saw from achieving maximum performance. Adjusting the carburetor with the air filter partially clogged is like adjusting the carburetor with the choke partially on.
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If you adjust your saw with a dirty air filter, the saw will run too lean when the filter is cleaned. Carbon clogging the exhaust port or spark arrestor screen can cause a saw to run as if the carburetor requires adjustment. Changing the carburetor settings with a plugged muffler may result in the saw running to lean when the carbon build up is cleaned out. This is accomplished by gently screwing the adjusting screws onto their seats and then backing them out one turn each.
Care must be taken when screwing them onto their seats because the seats may be easily damaged if the adjustment screws are seated too hard. These seats are delicate and if they are damaged, the carburetor has to be replaced. The tank should be over half full. If the carburetor is adjusted when the fuel tank is nearly empty, the carburetor may be adjusted too rich when the fuel tank is filled. If the saw will idle let it run for a few minutes. If it will not maintain idle without stalling warm it up by repeatedly squeezing the throttle, do not run the throttle to wide open.
Carburetor adjustments made on a cold engine will be too rich when it reaches normal operating temperature.
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Try to set the speed at about RPM. Never set the idle so the chain runs when the throttle is released. If the saw will not idle, go to the next step. Slowly turn in the screw until the engine surges or starves for fuel. Make a mental note of the position of the screwdriver slot. Now slowly turn the adjustment screw out and the engine should run better. Keep turning the screw until the engine starts to load up. Make a note of the position of the screwdriver slot and compare it to the position of the lean adjustment.
Now slowly turn in the screw to a position where it idles the best. It should be about midway between the rich and lean settings.
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Slowly we lean the low speed adjuster by turning it in, till the idle climbs and it then starts to die. The optimum setting is between these two extremes.
Note that a saw adjusted too lean on the high can also die when accelerated. Adjusting the saw idle WAV. Chances are that the RPM setting has changed since you optimized the fuel mixture adjustment. Filter 2. Hot this week. All listings Auction Buy it now. Sort: Best Match. Best Match. Gallery view. McCulloch pro mac carburetor chainsaw part only bin promac EUR EUR Kart Cart EUR Was: Previous price EUR EUR 7.
Was: Previous price EUR 8. Only 1 left. McCulloch power mac 6 carburetor carb chainsaw part only bin 46 EUR Was: Previous price EUR 7. Was: Previous price EUR 2. McCulloch carburetor chainsaw part bin 4 EUR Was: Previous price EUR 9.
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