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Re: starts and then runs wide open.
I'm not sure I understand the problem description but it sounds like normal behavior to me.
The saws from Husqvarna, Jonsered, Partner I'm familiar with has the following starting procedure: 1) Switch on ignition and pull the choke fully 2) Pull the starter rope a few times until it "pops", i.e ignites 3) Push in the choke *fully* 4) Pull the starter a few more strokes until the engine starts - it will have approx half speed here since there is a throttle hook-up mechanism, chain will be running 5) Push the trigger briefly to rev it up to full speed then release - this will disengage the throttle hook-up and the engine idles, chain should stop. Now it is ready to use.
This is what it is designed to do. If it misbehaves then you must give some more information for me to help you.
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Open, turn ccw, the high 'H' speed jet screw about .3 of a turn while holding the throttle wide open at the trigger. Engine should increase spread andyou may have to adjust. Failing that and assuming correct oil/gas mix it will likely be carburetion, clogged fuel filter or bad fuel line.
Kescorpio56: Check your throttle and choke settings. Something is causing the throttle plate in the carburetor to remain open or the governor is improperly set. I would reset the air/fuel mixture screws to one and a quarter turns out and back the idle screw all the way out. Make sure that the throttle cable operates the throttle properly and check the governor setting and reset the governor setting if needed. Start the engine and adjust from there. When the engine starts, adjust the idle screw until the engine idles. Adjust the fuel/air mixture screws for the best idle. Then run the RPM up and adjust the fuel/air mixture screws for the best run/idle combination. Don't forget to adjust the governor if the engine runs too fast or too slowly.
Do you mean that you replaced the piston and cylinder? The head is built into the cylinder. If you did change these did you also change the crank seals at the same time? Are you getting spark? Is it getting fuel meaning is the spark plug wet with gas when you try and start it?
You need to take the float bowl off the carb from the bottom . You haven't given a lot of information about who did what to the carburator but somebody must have screwed with the float pisition for this to be happening . The way all carburtors work is the same you have the float bowl and the floats and on top of the floats is a valve called the needle valve. Now the neddle valve is there to stop the flow of fuel into the float bowl when the engine is not in a high damand cycle for fuel like start up or ideal the choke shuts the air off and gives more fuel at start up .However when the engine is running and the float bowl is being filled by gravity feed from the gas tank the floats will move up do to the amount of fuel in the float bowl and should shut the fuel from the gas tank off to the float bowl until the engine can burn the fuel and drop the float level enough to make the neddle valve open again to supply more fuel for the engine to run correctly its a never ending cycle . You need to adjust the floats and likely clean the carburator don't mess with adjustments there mostly automatic when the engine is running
Simple solution your weed-eater has a Walbro carb buy a rebuild kit and rebuild the carb and it will run like new, don't touch any screw settings on the carb. You can purchase from your local repair center just give them the number on your carb and they will give you the correct kit. Go to smalleng.com they have a video on just this issue. Good Luck.. Don't forget thumbs and feedback.
Gasoline- thank you. Warm up is not an issue like diesel is. Sounds like the choke is is either wide open or over choking. With the engine cold, remove the air cleaner and note where the plate is at the opening of the carb. If it is wide open then without touching anything else and engine not running, step down on the gas pedal and see if the choke plate reset itself to restricter the carb inlet. If it didn't, then take some WD 40 and spray the linkages and the rod ends holdin the choke plate.By hand work the plate and linkage holding the gas open at the carb. Then set the plate to wide open and do the gas pedal thing agan to see if choke sets itself back to restricting the carb intake. If it does, start the engine and as the engine warms upm the choke plate should start opening on its own and you are off and running. Roitine question. Is your air cleaner clean? If the choke plate needs adjusting. get back to me. K? Good luck Remember to press the gas pedal down once before cranking. That sets the choke for cold start. Hope this helped you Good luck Note, the WD40 won't hurt anything but avoid spraying with engine running or when engine is hot..