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Is there a spark at the plug?
Is there good induction and fuel reaching the combustion chamber?
Is the choke, strangler or cold start working?
An engine needs compression, timing, the right amount of fuel a good spark and a decent cranking speed in order to start.
A side valve easy start engine is likely to have a low compression pressure as would an ohv engine designed to run on poor fuel. Other types of engine with low compression but a good cylinder leakage results probably has a dry or fuel-washed bore and adding a little oil into the cylinder can improve matters.
check you have good compression. remove plug and cover hole with a bung( cork of rubber) .
there may be some debris keeping the inlet valve open .
try compressed air to blow out cylinder whilst turning engine over(pull the cord).
reinstall plug and it should fire.
carburetor float is either bad or sticking.shut fuel off remove fuel bowl 10 mm bolt once removed pull pin out of float and inspect it at the same time re open fuel valve to allow fuel to push any debris the might be still in the port.re install float and test by slightly pushing the float upward and turn fuel on no fuel should drain unless you release the float if float has any fuel inside replace it if not finish putting it together and problem solved:)
If you have spark and you add a splash of to the throat of the cab does it fire briefly?
If the generator has sat for some time the fuel in the float bowl will turn into a varnish like substance (shellac). The residual fuel in the carb will have to be removed. You do this by removing the fuel solenoid (or bowl nut) which ever one youhave that secures the float bowl to the carb. Then take a screw driver and remove the main fuel orifice and remove the debris from the main fuel orifice. Clean the orifice with carb cleaner. DO NOT push anything into the hole! Also spray the brass tube that the main fuel jet screws into with carb cleaner. You should see carb cleaner being sprayed into the throat of the carb.
While the fuel float bowl is removed get a spray can lid and hold it under the carb float. Turn on the fuel selector and the fuel should completely fill the spray can lid in 8 - 10 seconds. If you do not have this amount of fuel flow you need to remove the main fuel line from the carb and re-check fuel flow. If the flow is good here then use carb cleaner in the float needle area to force any debris back out the fuel manufold connection that is now open because you removed the fuel line. If you still do not have fuel flow then check for debris in the fuel tank exit port, the fuel filter, the sediment bowl under the fuel shut off assembly.
Make sure to re-install the main fuel orifice in the treaded area that secures the float bowl in place. .
One more thing to do... just in cause you have a valve that is sticking is to add a few oz of fuel to the spark plug hole and leave the spark plug out. Use the recoil with the ignition switch off and pull the recoil to spin the engine as fast as you can to get rid of the fuel you just added.
If the engine has a fuel solenoid hook it up and and see of it is working as you turn the key / engine switch on and off before you reinstall the float bowl. You make have to hold the case of the solenoid against the engine to make a ground AWAY from any residual fuel for testing. I.e. don't burn up your generator.
The above steps are successful most of the time on generatosr that have sat idle for an extended period. I have been working on generators large and small for over 40 years.
If none of the above steps work; I need your engine model number so I can look up carb data.
GX 340 or GX 370 is not what I need... I need the number that is on the base of the engine usually stamped horizontally on the cran case base near the oil filler port or oil level sensor depending on engine orientation.
Three things needed for engine to run. Fresh fuel, good spark and good compression. I am assuming that water supply is disconnected for now and that you feel good resistance when you pull the rope indicating that there is compession. For now remove/unplug the low oil alert wire (if your model has one). Use carburator cleaner as fuel for now by spraying fuel directly into carb with air filter removed and choke off (do not flood just spray a little then little more if needed, the engine will only begin to run then stop unless you contine to spray fuel). If the engine does not respond most likely timing belt or plastic cam is cause. GCV series honda engines use timing belt with plastic cam gear. Gx series use metal gear. If the engine responds clean carb. Good luck
Not sure if you mean engine will not turn at all (locked) or engine will not start. The engine may have been on its side causing this condition. Clean carb and filter of excess oil. Remove spark plug and clean cylinder and plug of oil that may have entered causing locked condition. Replace oil lost from crankcase. With spark plug removed and kill swith on off, pull rope to blow out oil and verify that motor will now turn. If it still does not turn could be lock rod to crank or faulty pump. If engine had very little or no oil in crank and was run, suspect locked crank, however if your engine has oil senser, this condition would have prevented engine from starting. If you mean that engine will not start, low oil senser most likely preventing start due to low oil. Good luck
did you leave fuel in it from last year, if so remove all fuel from tank, drain carb. (remove float bowl if it doesn't have a drain bolt) put in fresh fuel, check your oil level and you should be good to go. if not, please take it to a qualified tech. for carb. cleaning.