the impulse line is the line that comes from the crank case and pressureizes the diaphram in the carberator the carb should have more than one line on it make shure they are all clean
thanks every one for the use full information i will take a look at the carb and tune it up first and check the cylinder then go from there talk back when have more info on it
just fpund put that the muffler is broken bedind the mane bracket so ill be looking for one of those two but the saw runs great just a couple of adjustments to the carb and ill be set when i get my piston cover hopefully thanx to Calvin