Re: need carberator settings for a sears craftsman...
You don't want to tighten them down just turn them in until the are just snug and then turn them out. Start with the low at 2 full turns out and the high at about 1 full turn out. Start the saw and let it idle adjust the low idle to where it runs smooth. Adjust the high until the saw runs as much rpm as you can get at w.o.t. (Wide Open Throttle).
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Please check the obvious, fuel, filter, do you have a spark at the plugs? if yes then a fuel issue. If it starts with starter fluid spray then it sounds like a carb issue. If it still won't do a compression test
take off the carburettor,take it apart,let it set 3 or 4 hours on a gallon bucket of carburettor cleaner,take it out and wash it in water to get out the cleaner,blow it out with compressed air and put a new carb kit in it ,put it all back together and put it on the generator,it should only need some adjusting and it should run fine,Tommy
You have a problem with the carb float valve. It is no longer sealing causing fuel to continue to flow into the float bowl after it is full. It may be dirty, out of adjustment or just need to be replaced because old and worn out.
This means that you are over fueling. There is more fuel going to the carberator than air. By removing the air filter you are allowing more air flow into the carberator, which is allowing the engine to run right. Natural gas and propane generator must have no more than 11 inches of water column. Gasoline engines should have no more than 3.5 psi out of the electric pump. If gasoline is gravity fed, then this means that you need to rebuild the carberator or purchase a new carberator, but try to adjust the flow valve on the bowl of carberator first.
being a 2 stoke there isn't much to tune up. the MOST IMPORTANT THING TO REMEMBER IN A 2 STROKE IS GAS AND OIL MIXTURE,too much oil will foul plug no big deal. replace plug. too little oil in gas will wash the crome lining in the cylinder off and you won't have the compression need to burn the gas any more. once you get that straight crank the saw and run it wide open, it should be quick to react to the trigger, that is no stumbling until it finally turns up. if it don't have a small screw driver handy and turn down the screw for the run mixture until it runs as fast as it can. also let idle. it should run on idle as long as you don't turn switch off. if it loads up and quits turn in idle screw until it does idle right . that's about it. also always make sure chain on bar isn't sagging too much when not running. a loose chanin will cause uneven wear on bar and make a crooked cut.keep chain sharp. they dull quick.NEVER leave gas in tank for long periods of time. after each use drain tank and start until motor runs itself dry.
you have to download it, but it isn't too much trouble, page 16 lists a whole laundry list of possible problems. Word of advice, change your oil in the pump regularly, if it is burnt appearing you might want to consider replacing rings etc and complete teardown, we didn't and trashed the pump.