o get it to run. Even after an hour of running, choke must be on just to get it to run slowly. The only difference may have been gas, but it has been replaced and still a problem. If I could download a shop manual I would remove the fuel tank to see if there is a clog. I have drained problem gas but still a problem. thanks for any help
Honda

Experienced gardeners share their insights in answering this question :
Hi,The air filter may be dirty, have a look at these tips for troubleshooting lawnmower startup problems:http://www.this site.com/support/r9118692-lawnmower_not_starting

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A lawn mower that only runs with the choke on might be having problems with the carburetor, air supply, or bad fuel. Maintaining a clean carburetor will make the fuel delivery system run smoothly. Use high-quality fuel to extend the lawn mower`s life.
If the choke is left on for too long, excess fuel flows into the combustion chamber, causing it to seize up and stall. If this happens, the lawn mower will need to sit idle for several hours to allow the fuel to drain out of the chamber. Turn off the choke and try again later.
An engine that will fire and run with the choke closed but dies when the choke is opened likely has debris at least partially blocking the fuel passages in the carburetor. In this condition the closed choke provides enough extra fuel to enter the engine to overcome the lack of fuel flowing through the other passages.
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.
In carburetor. The choke, a butterfly valve, reduces the intake of air and allows a fuel-rich charge to be drawn into the cylinders when a cold engine is started. As the engine warms up, the choke is gradually opened either by hand or automatically by heat- and engine-speed-responsive…
Clogged or Dirty Air Filters

It is one of the most common problems that cause lawnmowers to sputter. The mowers take the air from the surrounding through air filters and mix it with fuel inside the engine. So, if the air filter is clogged or dirty, it will affect the flow of air into the carburetor.

As the fuel level drops, a vacuum begins to form in the fuel tank because air can get in to fill the space the consumed fuel occupied. After about 10 or 15 minutes, the vacuum will become strong enough that fuel will stop flowing to the carburetor and the lawnmower will die.
Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten. Dirty Air Filter: Clean or replace. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas. If this doesn`t work, you might need a new fuel filter.
A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.
If a motorcycle or ATV only runs with the choke on, it`s because the richer “choke on” mixture is actually closer to the engine`s normal operating fuel mixture than the leaner “choke off” mixture. So when the choke is turned off, the engine gets too little fuel and too much air for it to run and it stalls.
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.
If your bike is only running with the choke on, it`s probably because it`s running too lean. This can be caused by a few different things: All internal combustion engines need three things to run: fuel, air, and spark. If any of these are missing or not working properly, the engine won`t run.

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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?
ANSWER :

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I have an old Honda Harmony HRM-215 lawnmower. The first time I used it this year it worked fine, now I have to leave the choke on fully just to get it to run. Even after an hour of running, choke must be on just to get it to run slowly. The only difference may have been gas, but it has been replaced and still a problem. If I could download a shop manual I would remove the fuel tank to see if there is a clog. I have drained problem gas but still a problem. thanks for any help
ANSWER : Hi,The air filter may be dirty, have a look at these tips for troubleshooting lawnmower startup problems:http://www.fixya.com/support/r9118692-lawnmower_not_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.
ANSWER :

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My tractor stalls like it is starved for gas although the gas tank is full. I,ve changed the fuel filter and the gas cap. I’ve cleaned out the gas tank, gas lines, and the carburetor bowl. The problem seems more acute when the gas tank is full or near full. At this time to alleviate the problem, I blow through the gas cap and the fuel filter fills with gas and it runs good again. But as soon as the fuel filter has no more gas, of course, it stalls until I blow on the gas cap. As the tank gets down to about 1/3 full, the engine runs OK. What else could cause this condition?
ANSWER : I had a similar problem with a sears tractor. close to the carbarator is a rectangle box with a rubber hose going to the engine block – remove the hose and spray carb cleaner in the hose wait a few mins and try again – its a vacuum for the carb

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Hello i have a Honda GX160 and the engine will only run on choke if i close it the engine just splutters and thats it. it wont run at the norm i have replaced the carb the tank the air filter and the spark plug and know luck i have no more ideas as to what the problem really is thanks jord
ANSWER : Ii know you must have replaced the fuel filter. Did you replace the fuel line? It is obvious it is not betting enough fuel or it is out of time. Have you tried adjusting the jets on the carb? Have you checked the timing? There is a crankshaft key-way that may be bent just enough to get the engine out of time. And finally have you checked the fuel pump which I would suspect is your problem. The diaphragm may be busted.

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Even though I have the carb. set in choke, and press the bulb many times, it doesn’t seem as if and gas gets through. I eventually put the carb. setting in Run and pull the crank many times before it starts. The blower is 2 years old, used on about 12 lawns per week. The problem stared in mid summer. Any suggestions? Thank You.
ANSWER : Here is a Link to one of my Tips:www.fixya.com/support/r6081405-cleaning_small_engie_carburetorGood Luck!Jim

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I know this is a pretty old thread. But I have a 2004 Husqvarna 359 and it does the same thing. Has anyone found the cause of the problem yet. It seems to die from lack of fuel or too lean of a mixture only when the saw is hot. I have : removed the cylinder and found it to be scored very bad, i replaced the cylinder and piston, replaced the fuel filter, removed the carb and checked for debris, new spark plug, new air filter, changed fuel to a 32:1 just to see, all to no avail. I dont know how to test the ignition module, and I dont know if there is a way to test the cranck shaft seals. If any one can give me advise from here it would be greatly appreciated. Thank You, Brian in Spokane Wa.
ANSWER : I didn’t want to close the thread in case someone else had some ideas. We can still discuss this problem. Enter any clarification or additional information below the advertisements. HTH
Lou
Hoped Dolf would chime in.

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I cannot get the tractor to continue running even after I add starting fluid. It runs as long as I add fluid. I bought a fuel filter , pump and hoses. I still can’t get the engine to keep running. I even took off the gas tank and drained it. John Hanna Jr, Gallatin, Tennessee 37066
ANSWER : I would take the carburetor apart and soak it in a solvent. It is very common for the fuel passages to become blocked by gasoline which has turned to a shellac type substance over a long winter of sitting idle. If it was running fine earlier this year then that is not the problem, but it sounds like a fuel supply and you have excluded the other possibilities so I would give that a shot anyway.

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