20 hp 42 in. Deck Yard Tractor
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Couldbe poor gas quality or your air fule ratio is off. With the choke “on” it limits the amount of air that the carb takes in.
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Why would the engine only run while the choke is on or with repeated manual priming? An engine that requires the choking (partial or full) after initial engine warm up is an indication that the engine fuel air mixture system is out of adjustment.
Why Does Your Lawn Mower Only Run With Choke On? Your lawn mower only runs with choke on because of a problem with the engine fuel-air mixture system, which can be caused by the carburetor, bad fuel, or air leaks. The choke compels more fuel in the combustion chamber to help the engine to turn over when cold.
Its common for small engines to need carburetor adjustments over time. Your engine is running lean and putting the choke on partially is helping it draw more fuel to run good. Adjust the carb if its adjustable or buy a new carb. You can find info on carb tuning in small engine service books.
Manually – A manual choke is controlled by a lever on the side of the carb. A lever or knob inside the vehicle is then attached by a cable. This requires a person inside the car to slowly open the choke by hand. Automatically – An automatic choke uses a metal spring to open and close the choke plate.
Constant Choke Carburettor:
In this type of carburetor, a consistency is always maintained for fuel and air flow areas so that they remain constant. However, the difference between pressure or depression which triggers the flow of air and fuel varies according to the need or requirement of the engine.
It will not damage the engine at all. All that will happen is that it will run richer, thus using more fuel. If you did it for thousands of miles you`d probably end up with more deposits in the engine/exhaust, but even that is easy to sort.
We do not recommend that any type of outdoor power equipment be operated after initial warm-up and with the choke control outside of the normal run position for longer than 5 minutes. Some engines utilize a manual fuel primer bulb to enrich the ratio of fuel in the fuel air mixture for initial engine starting.
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Have a craftsman 16″ chain saw 358.360260. Could not initially get it started after it had sat for a couple years with fuel stabilizer in it. When I went to use it the fuel had all evaporated and the fuel pick line was rotted. I replaced that with some difficulty but finally got it on. Saw still wouldn’t start. Replaced the fuel filter. Still wouldn’t start. Pulled the carb apart and cleaned and recleaned everything. Diaphragms were good and I didn’t adjust any of the mixture screws because as I said it ran fine before storage. Non of the carb passages were clogged. Fresh gas 40:1, good spark plug and good spark. Airfilter is good. Engine has maybe about 4 hours of total run time on it. It’s a ZAMA (?) carb. It will run for about 30 seconds when I manually prime it by pouring a small amount of fuel directly though the carb. When I was disassembling the carb the vent hose that goes back into the fuel tank seemed to have a small out of ?substance? in it which I cleaned out. It was right at the end the of the hose that goes back into the fuel tank and not up by the carb. It didn’t appear to be like your typical gummy deposits/varnish though. I hope it wasn?t some type of spongy check valve stuff that is supposed to be in there. That might explain some of my problems. Anyway, I also can not seem to get the primer bulb to fill. When I open the fuel tank, look in side and depress the primer bulb, air bubbles come out of the fuel filter. But when I let the bulb reexpand there’s no fuel that gets sucked up the hose. I can however seem to fill the primer bulb when the fuel tank is full and the chainsaw is laying on it?s pull cord side and the bulb is depressed a bunch of times. The saw will also start and run again for about 15 seconds then die. It’s definitely not getting/fuel and probably running out . Thanks.
I have a husqvarna 323L string trimmer. I stored it after running the tank & carb dry for about two years. I fueled it, then started it, & it ran for a minute then died like I turned the switch off. Since it would not restart, I found the fuel filter had broken off the hardened fuel line & it sucked gummy crap out of the tank & into the carb. Failing at cleaning the carb, I finally put a new carb on it & replaced the pump, hoses & filter. It has ran good till this year. I winterized it with stabilizer & left it with a full tank over the winter. The gas in the tank was gone when I got ready to use it this year. I filled the tank with premix, checked for leaks, then started it. It would run fine for about half a tank, start idling poorly (lean) then cutoff & refuse to restart till I refilled the tank. I finally found the tank had cracks & was letting pressure out of the tank & apparently this was causing the carb to lose it’s ability to siphon gas out of the tank. So I replaced the tank which came with new hoses & a filter, which I properly installed to the carb. It cranked right up, but when it runs a half tank, the carb quits sucking gas out of the tank. When I pump to prime the carb, it moves the fuel into the carb, but the pump never gets hard like it does when I prime the carb when the motor is cold. I have to keep refilling the tank, prime, & then it starts & runs until the tank gets about half empty. The new fuel filter is down in the gas tank properly, but It will not run after it shuts off until I refill the tank & prime. I’m baffled. New tank, new hoses, new filter, new carb, & I can find no leaks in the fuel system. It runs strong. The 323L is a two-stroke & it always cranks on the second pull from cold on a full tank. Any ideas?
Have to run on half choke,just stops if i turn it off.fuel is 25 to 1. thanks alan.
More than likely a small passage way in the carb is clogged. You can try some carb cleaner, but you may need to disassemble the carb and clean it out. Be advised that these passageways are sometimes as fine as a human hair, and almost impossible to clear sometimes. A new carb may be required if it is worth it to you. Sorry.
Can get it to start, but runs about three seconds and stops. the choke is pushed in. But seems to want to run longer with the choke out. 4 seconds…
Its the old problem,,,,,,,short of fule, or no fule getting to the carb,,,,, clean out the tank filters and then clean out the carb and all the jets in it as well put in fresh fule and then it will run all day and with out the choke being on,,, thats a lot longer than 4 seconds!
My mantis will not stay running unless the choke is full on
Sounds like the fuel pump diaphram in the carb. you need to either be familar with it or take it to thae shop to replace
Will only start and run in choked position, when throttle applied chokes out. If started with out choke and throttle position in low speed will start and run for 10 sec then like it runs out of gas.
I have your solution guaranteed, I fixed mine yesturday remove H L screw plastic caps and on high 11 threads exposed and on the low side 8 threads exposed. removing the plastic caps allows u further adjusting these wear out or move soo just take them things off and you will be rolling
Want run unless choke remains on – Stihl Bg72 Leaf Blower Intake
Probably fuel starvation.Wrong fuel air mix settings on the carb. Damaged carb diaphragm.
Why will My weed eater only run with the choke fully on and cant give throttle?
It sounds like the carb needs adjusted. Things can even happen to new weed eaters.