If you are getting a spark, that would likely point to fuel as the issue. Saws and the like are prone to foul carburetors with the use of ethanol fuels. Ethanol can also break down fuel lines and some plastic parts. Check the hoses and filter in the tank to ensure they are in good condition. A white powdery residue can build up and clog the carburetor up. These carbs are fairly cheap so I would suggest changing that out and see if it solves your issue.
SOURCE: Husqvarna ranger 55 chainsaw starts but quits
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!
Yes, you will need to disassemble carburetor and clean with carb. cleaner. If you need tips on how best to do this, just let me know. Or you may need a new carb. kit.
Jim
SOURCE: I have a Toro Model
check your mower for interlock switches that might interupt spark for safety reasons.
A chute switch or something like that. Check your owners manual for troubleshooting.
Unplug the keyswitch and try pull starting to rule out a bad switch.
If it still doesnt have spark you might need a new coil.
The coil is right under the recoil cover and are fairly cheap.
A set of hand tools and $30-50 for the part should do it.
Good luck and be careful.
SOURCE: cannot get the saw to start, even with starter
I assume you have installed a new spark plug. Most common problem is the fuel pump diaphram in the carbuerator goes bad. Rebuild the carb in that case... about $20 for the kit... Last problems are the magneto coil or that the flywheel key has sheared causing timing to be off.
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