Fuel line from tank to carb. is usually only four or five inches long. I recommend buying a foot of new line in different sizes. Carb. idle screws generally one in a half turns out for a good start position. May have to fine tune them a little bit more or less.
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take apart your carb--sounds like your carb diaphram is not installed right the settings should be
1.5 turn out low jet
1 turn out high jet
that should get it running then some fine adjustment once its running
First, if it has a "torch" plug, toss it. Go for BM7A NGK.
See that nothing has come loose- carb & thereabouts.
Dump fuel & put in FRESH mix.
Carb may need adjustment.
See that ignition switch lead and switch are not intermittently shorting.
If all else fails, do a vac/press test- could be crank seals.
More info up front makes it simpler.
First thing, try new gas.
If that doesn't do it, you need to adjust the low and high speed circuits on the carb. A good starting point is 1.5 turns out from fully seated. On that saw I'm not positive if you will have access to the adjustment screws unless you pull off the plastic caps that may be covering them.
First I would start with the fuel filter, was that replaced too?, then I would make sure you have fresh gas and a new spark plug, Probably what I would suggest next is to pull your carb off and take apart and clean it with carb cleaner, most likely you will find dirt and possible small fragments from rotten fuel lines,partially plugging the inlet screen in carb, also your diaphram could be stretched, wouldn't hurt to pur carb kit in it while it is apart, I have just cleaned them before and been o.k. this should help you out
Ok lets get the pipes conecterd correctly to start with, the hose comeing from the tank with the filter on the end, connects to the carb fuel inlet nozzel ( the nozzel neares to the pump cover held with one screw ) the pipe coming from the other nozzel on the carb goes to the short nozzel on the primer ( suction ) then the pipe from the longest nozzel on the ptimer goes back to the tank, once you have this correct, try the saw again. Change the filter in the tank, the carb screws will have some type of anti tamper device, this is why you only have a small amount of adjustment, you may need to remove these to adjust the carb properly, if there are any splits or cracks in the fuel lines the saw will not run properly.
Normally you would need a screwdriver.But the adjustment screws on your saw have plastic caps on them that will only turn about a1/8 of a turn.these are pre-set at the factory.you will need too take carb off and clean it out.if that doe,s not help it needs to be rebuilt or replaced.
If you had this apart, a few things may have happened. First the linkage from carb to throttle trigger maybe jammed between plastic housing or linkage may have come apart and throttle is in the full open position. You'll have to take this apart again and follow the linkage between carb and throttle trigger to ensure all is connected and moving freely and properly. Use care when putting housing back together.
The preset is to turn them all the way in (Don't tighten them hard or you will damage the needle) and then back each out 1 1/2 turns. This will get you started. You can then run it at full throttle and turn the high speed jet in untill you hear a change in the RPM. Then turn it out untill you hear the same. Find the happy medium.