Question about McCulloch Chainsaw Shop Repair Manuals 121 Pages

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What us the 'H' and 'L' on my chainsaw and how does it work

My chainsaw is PM484 No.0034830 and I am having trouble starting it I think it is probably due to my query

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I wouldn't mess with those High Low and idle speed knobs unless you know what you are doing. It is to hard to set them straight once you screw them in and out and lose track of your turns. The idle screw (T), might be Ok to mess with, but if you aren't starting, this won't help you. Try a shot of ether into the carburetor and see if it starts with that. If it starts, it means oyu have spark and probably compression. So you know it is fuel problems if it starts on ether. A lot of guys put to much oil in the mix and the mixture isn't volatile enough to burn and it just fouls the plug. Try the ether with a little choke but don't use the primer bulb. If the gas is bad or too oily the primer will just flood the plug. Try mixing the gas with about 1/2 the amount (1:20 ratio) and see if it starts. I always determine the correct amount of oil by watching the amount of smoke coming out. If I don't see hardly any smoke I add more oil until I see it. Since 2 cycle motors don't have a oil pan they got to get lubrication from the oil in the gas. So it is a fine line...too little oil and the cylinder runs hot and can be damaged from friction...too much oil and the engine is hard to start, especially when cold or trying to restart after it has sat for a while.

Posted on Dec 25, 2012

  • biire2u Dec 25, 2012

    sorry..i meant oil to gas ratio of 1:50 up to 1:80, not 1:20..

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There are 3 screws on the carb the idle screw usually marked with a T or an I, this screw contacts the throttle spindle and opens it to increase the idle speed, the L screw is a fuel screw, so by screwing it out ( anti clockwise ) will increse the fuel flow through the carb, the screw will adjust the idling, and acceleration up to half throttle, the H screw is also a fuel screw, this will adjust from half throttle to maximum revs, the max revs should be set with a tacometer to the manufacturers fast no load speed, small amounts of movment on boyh screws will make a big difference.

Posted on Dec 08, 2012

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