Won't stay running, we changed the spark plug and changed the gas. will run for a few moments, if you turn the choke off or press accelerator it dies

Needs a carb adjustment, cleaning, or possible rebuilt. Try adding a little seafoam and running at half choke for about 5 mins or longer this may clean it up nicely. also check the spark plug.

Clean or change air filter. Clean, gap or change spark plug. Empty gas tank add fresh gas with Stabil. When spark plug is removed pull rope several times to blow out cylinder. Spray starter fluid in spark plug hole before replacing spark plug. Clean outside of carb so choke works freely. Spray starter fluid into carb breather hole with air filter removed and try to start. if running replace air filter and cover. If no start disassemble carb and clean. If no start replace carb.

Clean trottle body,Tune up,fuel filter,coils.

Here are a few things to check, that are solutions for your symptoms. Check, then clean or replace:

• Fuel Filter - located in the fuel tank
• Spark Arrestor - at muffler
• Spark Plug
• Carburetor - may need rebuild kit?

Look here...

And...

remove the muffler and run it if ok open the muffler and cllean the screen inside a resticted exhaust will not allow exhaust flow then the engine can't rev up

hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vacuum to where there is fuel forced in the carb to rum,also the gas will evaporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replacing gaskets or fuel line if necessary.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where they want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow until machine runs also you need to check for spark by removing plug and grounding against engine to check spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, ~~

On electronic fuel injection pumping an pumping an pumping the gas pedal does nothing without the engine running ! Pushing the gas pedal to the floor will cause the PCM - engine computer to go into clear flood mode .

You have some very interesting ideas here , but not really how it works or is !

The vehicle will go into closed loop fuel control when the engine coolant temp reaches a definded temp an the O2 sensor get hot.

She would run for a couple minutes and die which is open loop when running, closed loop is when the sensors kick and it would die. Pulled spark plugs, they were black meaning no spark. Can only be 2

Black spark plugs indecate a rich condition , over fueled , wet spark plugs indecate no spark .

Spray starter into the carb intake with no choke, if she runs for a few seconds then you know its fuel starvation
clean jets & airways & blow through with compressed air

Carburetors could be dirty/blocked. Open throttle and spray carburetor cleaner in them, wait a few minutes, then start. Also spray carburetor cleaner again when revving. Should fix it.
Also, try starting with no choke and no throttle. It could be flooding.
Clean spark plugs.

check spark plug sounds it s heating up to much make sure of oil level and if it has been sitting a while dump the gas in it and fill it with new and buy some sea foam and add a little to the gas