For more information, as to how a carburetor can cause this symptom, please see our carburetor section. With frequent use, the chainsaw deposits carbon in the muffler. Also, you should check your air filters and fuel filters. It can also be damaged on the inside. Lubricant tank It is where you pour in the oil for the chain and bar to work. Sounds like a blocked passage somewhere to me. I will check all this stuff when I get it back into the shop tomorrow. Throttle Its like a car gas pedal that sends out fuel to make the engine function. the fuel cap contains a one way duck bill valve. Mix in a premium 2-cycle oil that is ISO-L-EGD and JASO M345 FD certified. Now slowly turn the adjustment screw out and the engine should run better. If it roars to life, but then falters and shuts off, that's a problem often caused by the idle. Start with the air filter housing filter and air filter, and take off the bolts holding down the carb and gasket. Take the muffler off and look in through there or get a flash light and look in through the plug hole and see if you can figure out what's up. Chainsaw Idle Adjustment. Tips from a Professional You'll either tweak a single screw or three separate ones, but the premise is the same in both instances. If this adjustment is set too high, the high idle speed will cause the centrifugal clutch to engage and the chain will run. Low and high adjustment Its function is to control the saws idling speed. You can download Zama's technical manual from zama's website. Craftsman Chain Saw - Revs very, very high on idle When there's too little fuel, the engine will run "lean" and won't have enough power, so using it as intended can cause engine damage. First, locate the "LA" screw. Slowly we lean the low speed adjuster by turning it in, till the idle climbs and it then starts to die. This ensures our chainsaws meet our standards in design and performance - standards that have made STIHL the clear choice for professionals and homeowners, making STIHL . The tank should be over half full. Chainsaw Idles but won't Rev. Tips from a Professional Have you tried backing out the idle screw? Your email address will not be published. If you fail to improve performance by replacing filters or adjusting the carburetor. I recommend idling it for some minutes to help regulate the engine temperatures and, after that, crank up the RPMs by pressing the throttle. Poulan Pro chainsaw starts, idles extremely fast, but dies when I hit
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