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Re: Husqvarana Rancher 55 , how to clean the exhaust port
Cleaning the exhaust: on the saws I've worked with it was just to loosen two bolts at the front and then the exhaust is off the saw. Clean with brake cleaning fluid and blow with compressed air, let it dry before assembling. Don't forget to clean the fine mesh at the output side underneath the lid if present (i.e the spark arrestor).
Make sure to have your carb adjusted properly afterwards.
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The vent is not working properly or was installed incorrectly, so there is no negative air entering the tank to take up the space of the fuel leaving it for the combustion chamber. Perhaps your tank cap has a vent as well that isn't working.
check your fuel filter/gas line in tank you could have a crack in your line that in the fuel till it gets below half tank then sucks air through crack, It's a possibility, other than that, check your exhaust port, but sounds like a fuel problem check your fuel tank vent also to make sure it is venting. Good Luck
Hi sewallgood, I will try to give you a few suggestions to help solve this problem. I see you have replaced the piston and rings. Did you hone the cylinder wall before installing the new piston and rings so the new rings can properly seal ? Have you checked the compression after installing the new piston and rings? Did you have instructions on how to properly clean and install a new carb kit, as it is very important to get it right on? Have you cleaned or replaced the air filter? When working on the carb, did you replace the very fine mesh filter that is located inside the carb? What can cause the engine to run just a few seconds, can be the fuel tank not venting. As fuel is being removed from the tank, air has to replace the volume of fuel removed. This is usually done by the fuel tank cap that has a 1 way valve that lets air in without fuel leaking out. Some others have the valve installed on the fuel tank itself. Check the valve for obstructions or if damaged. Being careful try running the saw with the cap loose and see what happens. There could be an air leak somewhere, affecting fuel mixture, (gaskets, loose bolts, etc.). Something that not too many people check is carbon build up at the exhaust port that will restrict exhaust gasses causing too much back pressure. This can stop high RPM from the saw. Remove the muffler and clean the carbon from the port. Set the piston at top dead center so carbon does not go into the crankcase and use either wood or plastic tool so piston and cylinder wall are not damaged. To adjust the carburetor turn both mixture needles in (clockwise) until lightly seated so no damage is done to seat or needle. Now turn the 2 needles out (counterclockwise) about 1 1/8 turns. While engine running and warmed up, adjust until running good. Do not adjust high speed mixture needle too lean turned in (clockwise) too much, as this could cause not enough lube or cooling and damage the engine. Do not adjust lower than 1 turn from a lightly seated position. Adjust the spark plug to .030". I hope I have given you a few good suggestions and that it is understandable. Any questions welcome. All the best and good luck.
Hi cookinmechan. I will try to help out. Did you check the air filter to be sure it is clean? It could be the fuel tank vent that is located in the tank cap. Air should be able to go in and nothing should be able to come out, making it difficult for the carb fuel pump to bring the fuel to carb. Check the fuel lines for any cracks or degragation that could be plugging them. The carburator might need cleaning and new carb kit. There is a fine mesh filter in the carb that needs to be cleaned or replaced. That is a common problem with this type of carb. There could also be an air leak so you might want to check the screws and bolts for proper torque to make sure that doesn't happen. Is there a primer on the carb? Make sure it is working and hasn't come hard so that it doesn't pump enough gas to help start engine. Something that most people and some mechanics don't look at is carbon build up in the exhaust port making it difficult for exhaust. Remove the muffler and look for carbon build up. Sometimes there is not much of an opening for proper exhaust. To clean, bring piston to top dead center and get a piece of wood or plastic to scrape out carbon. Do not use any type of metal so no damage is done to piston or cylinder wall. I hope this helps you out a bit. All the best and good luck. Questions welcome.
I think your on the right track Blowing compressed air through your tank vent is great but it is way more air than the natural asperation that the saw pulls on it own I would replace the vent cap and also look for a pinched fuel line between the fuel tank and the carb
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!
My 372 xp did that and when I talked to the repair shop they even showed me. There is a fiberglass gasket that is used to mount the carburetor to the engine. I have no idea on how this happens, but I saw it with my own eyes. The gasket had actually folded over. They replaced it with a rubber one and have had no problem since. The saw was hard to start, would run as long as I didn't try to cut anything and when I did it would open up and then die. I could be giving wrong information, but that sounds exactly like the problem I was having.