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This generator is equipped with an auto choke. What is likely occurring is as the engine warms up the choke is returning to the normal choke off run position leaning the mixture two lean to maintain operation of the motor.
This is occurring because the residual fuel that was left in the carburetor has evaporated and the gum residue is reducing the fuel flow through the carburetor. When the choke is applied the mixture is rich enough to support running and as the choke returns on its own to the run position the mixture leans out and the generator stalls..
Override the choke when the engine is starting to falter to confirm the problem. Continuing to attempt to run the engine possibly adding a carburetor cleaner additive to the gas will likely return the unit to normal operation.
If attempting to enrich the mixture by applying choke when the engine begins to falter does not work then a fuel flow problem to the carburetor may be the root cause. I would look for a plugged fuel filter or restricted fuel flow from the tank to the carburetor. What is happening is when the unit is at rest the carburetor is filling with gas and as it is running because of a restricted fuel flow the level lowers in the carburetor bowl resulting in a mixture to lean to run.
What elevation are you at? Start with simple things such as clean the air filter, fresh gas, clean/replace spark plug. Also check oil level most generators have a low oil shut off yours may be attempting to shut down
If it doesn't start but turns over ok. It may be a problem with the magneto / wiring or spark plugs. It seems as though this unit has no automatic shut down. I would try replacing the spark plugs BPR4ES NGK or equivalent and gap to .030, oil 5/30 or 10/30 will do takes less than 1 quart, & air filter (basic tune-up) if not performed in some time. Yamaha recommends every 20 hours. Then try again. Here is a link to the owner's manual. http://www.poweredgenerators.com/yamaha/manuals/ef2400is.pdf
The Yamaha EF2500 portable generator uses a NGK spark plug #BPR6HS. Just bought on this week at the local NAPA store to replace the old spark plug in my generator.
change the spark plug clean the fuel tank replace filters and oil change fuel line if cracking or stiff.
remove carb bowl clean out with carb clean remove any sch-lack from old gas run and test power.
hope this helps
When you pull the bowl off of your carb is it clean? If not you have some contamination possibly inside. You might want to remove the carb and blow compressed air through all the vents a ports.
The manual contains a schematic which does not show a heat sensor. You need to narrow it down to a fuel or spark problem. The easiest to check is spark. If you do not have spark, it could be the plug, wire, oil level sensor, magneto, coil or TCI module. If you have spark, then it is likely a fuel problem. Open drain and see if fuel is getting to the bowl. If not, check tank, valve and lines. If yes, it must be the carburator. Good luck.
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