Question about Garden
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Posted on Jan 02, 2017
I have a Stihl FS 45 and have had problems with it running for a short time then cutting out. The problem is like to be either- the filter attached to end end of the fuel pick hose that goes down into the fuel tank is blocked or- there is a crackor split in the corrugated section of the fuel pick up hose between the fuel tank and the carburettor. If such a crack or split exists it will cause air to be sucked in with the fuel upsetting the fuel/air ratio. A new hose not adjustment is the only cure
Posted on Jul 16, 2009
Battery is NO GOOD.... need new ones, these quickly go bad, if not religiously charged and discharged. You must charge a long time when first get them, and then as soon as flat must go back on charger, for at least 4hours... regardless what is said. If ever removed before properly charged, then it will "remain" at that level, next charge and so on... All batteries MUST be flat before recharge, and full before used again, no exceptions.
Posted on Mar 01, 2010
Hi and welcome to FixYa, I am Kelly. I know this is a 26 cc petrol engine on your trimmer but do not know if it is a 2 or 4 stroke engine. If you are in AU then it would be a 2 stroke. There are a few things that can cause this.
If you engine has a primer bulb.... Hold it depressed hard while trying to increase engine speed. What your trying to do by doing this is prevent air introduction via the primer bulb if it has a pin hole in it. If you can get normal speeds bu holding the primer bulb depressed HARD the primer bulb has a pin hole in it and must be replaced.
Also look inside the fuel tank at the fuel collection tube end. Usually there is a screen inside the tank. Some times the screen becomes coated with gunk and it has to be removed from inside the tank for cleaning.
If your carb has a fuel shut off on the side of it... unbolt the fuel manifold and pull the bolt out of the manifold. Models with this type of fuel shut off have a screen inside the manifold that has to be pushed out of the manifold and cleaned.
If after checking all of the above you still have the problem then it is time to remove the "L" fuel mixture screw on the side of the carb. BEFORE removal... rotate the screw clockwise counting turns until it JUST barely closes. Do not turn it tightly closed as the end of the mixture screw needle will break off inside the carb and you will have to replace the carb.
Then rotate the mixture screw ccw and remove it. Spray carb cleaner into the mixture screw hole to remove any debris.
IF your carb only has an "H" screw perform the same procedure above but for sure clean both the "H" and "L" mixture holes with carb cleaner. Wipe off the needles too.
Install both screws CW until closed and then reverse the number of turns CCW you counted before removal for EACH of the 2 mixture screws.
Make sure the FOAM Air Filter is NOT clogged with debris. Clean as necessary.
Start the engine and let it warm up briefly. Attempt to increase speed slowly to full speed. If the engine hesitates open the "L" mixture screw less than 1/8 th turn and try again. You should note a change in performance after rotating the "L" Mixture screw ccw. Begin rapidly throttling up the engine after EACH adjustment until the engine no longer hesitates or tries to stall upon acceleration from idle.
RUN the engine at TOP SPEED. Adjust the "H" Mixture screw until you get maximum engine rpm. You will NOT hurt the engine but it must run at MAX speed smoothly.
CHECK acceleration from idle to MAX again. re-adjust "L" mixture if necessary.
One last thing to check is make sure the gas cap is vented. Without a vented gas cap the engine will run briefly then perfromace will degrade substantially. Many times on trimmers I see people place plastic over the fuel tank fill hole and install a damaged cap. Replacing the cap has fixed many many trimmers with tank vent problems due to a bad fuel cap!
This should get you going again. If you need any more assistance or you still have the problem after performing the aboe please respond here with any updates.
Thanks for choosing FixYa,
Posted on Jan 03, 2011
I have had exactly the same experience, and then also replaced the primer bulb, messed around with the carby mixtures, but so far it will not run for more than about 3 - 5 seconds! I have yet to resolve this problem.
Posted on Feb 28, 2011
you've answered your question i would be inclined to be looking at adjusting the high low idle mixture settings and checking for a good spark also check the exhaust is free of obstruction may have a blockage
Posted on Jul 18, 2012
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