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remove fuel pump and check the diaphrams have not perished and valves are seated on housing ! But first try while engine is running if you prime the bulb does it keep running , if yes then pump not priming fuel !
Good Day Khairul, Are the Carbs Synchronized To Open And Shut At The Same Time? If This Is Correct ! Then Do You Need To Pump The Primer To Contine Running? If Yes Then Replace Fuel Pump DiaPhram It Coud Still Be An Electrical Fault, Coil,Trigger Or Stator . Check To See Condition Of Plugs After Running, Hope This Helps Regards Gordon
1. Fuel flow: Make sure fuel tank vent is open and not blocked while engine running. Check primer bulb is working and no air leaks along hose anywhere. Check function of fuel pump and ensure fuel is getting to the cylinders.
2. Overheating: Check engine isn't overheating and that water pump is operating properly while engine is running.