I have a Husqvarna rancher 55. Cut several loads of wood this year until saw started to run erratically and then stop. Saw would start after choking, but then stop like not getting gas. Didn't matter if it was hot or cold. Eliminated possible problems, plug, fuel filter, tank vent, fuel mixture. Now saw has no spark. Determined the coil was bad after unplugging kill wire and no spark jumped from the plug to ground out on the motor. Replaced the coil. Checked the gap, checked the magnets in the flywheel, still no spark. What haven't I checked?? Why no spark? Should I check for continuity?
I too have a rancher 55 and had what sounds like the same problem this week. It would start fine but run for only a few seconds at a time. I took it all apart today and found the problem - a cracked fuel line. In the places where I could see the hose it looked fine, but it wasn't until I removed the fuel tank that I found the crack...right where it exits the tank and then goes thru the housing above it. You don't need to remove the tank to replace the hose but it is easier that way. You do have to push it thru a grommet at the top of the tank. I read some other posts about checking the tank vent to see that it's not plugged up. Mine was ok so I knew it had to be something else. The vent is in a hole about the size of a pencil and is recessed about an inch into the tank on the upper right side. Its partially covered by a plastic cap that's part of the vibration damper, which can be removed to gain access to the vent. The vent tube can then be pushed out from inside the tank with the use of long needle nose pliers, but be gentle. I just loosened it then pushed it out with a finger. I put it all back together with a new hose and its running like new again!
By the way, you may not have a spark problem at all. I checked the spark and could never see it either, but yet when I put the plug back in it would fire up. I did like I've always done with lawn mowers to check for a spark...remove the plug, hold it against the cylinder head (plugged into the wire of course) and pull the starter. As long as I'm not in bright sunlight, I've always been able to see the spark if its working properly. But I was amazed that I couldn't see it on the saw.
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It doesn't sound like you've checked the on/off switch. Make sure its good. Also, make sure the ignition coil primary (small wire) isn't grounded (touching) to the saw frame.
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I'm quite certain it doesn't have a spark. I have tried it with the plug in the wire - no spark. I tried with starting fluid - no fire. Held my file in the plug end while pulling the cord - no shock. I checked the resistance with a multimeter. Old coil has 5ohms of resistance, new one has 2.8 ohms. I would gather from this that old one was going bad? New coil came with a new plug wire.
A little background that seems irrelevant, but I'm not an expert; while waiting for the new coil to arrive, I tried to remove the chain sprocket for lubrication by placing a screwdriver with string on it in the plug hole to lock the piston so that I could access the sprocket needle bearings. I gave up when it seemed l like I was going to break something. Could this have any bearing on the problem?
Fly wheel seems secure and I don't believe I have sheared the pin binding it to the drive shaft.
Any ideas?
I have checked the on-off switch. I disconnected it from the coil. It doesn't touch anything when the pull cord assembly is in place.
Thanks Jake 77. The fuel line was cracked exactly where you said yours was (where the line exits the tank). I replaced it with a clear line, so I can be sure this isn't the problem in the future. I got it to fire once or twice, but not actually run yet.
Now problem seems to be that it is flooding. I've pulled the cord with the plug out to try to get rid of excess gas, but everytime I remove the plug it is soaking wet with gas. I even tried to adjust the idle screw, as I had adjusted it before I knew part of the problem was the gas line. This didn't help either.
Worth checking the spark plug lead too. Could be damaged.
how sure are you id doesnt have spark? have you felt the spark or just tried to see it. most of the time you cannot see it in daylight that why i prefer to have someone pull it and hold a metal screwdriver between the plug and plug wire, this makes me 100% sure there is no spark. is the plug wire bad have you tested it for resistance?
after replacing spark plug and ignition coil there is intermitent and weak spark saw will not run
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