just wanted to know whether the problem of missing (phuk phuk sound as described by you) has been resolved on your generator or not ...coz i have bought a 3KVA china generator few days ago ....it has ran only 2.5 hours ...initial first hour it ran fine but i realized that the shopkeeper has put 0.5 liter of engine oil whereas it should be 0.6 liter ...so i just topped it up to o.6 liter by adding 100 ml or o.1 liter more...but after that it is giving the same sound like phuk phuk....like ~4 times per minute ...voltage is stable but i just wanted to know the reason...
I did put out the plug to see if anything is wrong with the plug but apart from a mild black/dark grey deposit on electrode everything was fine...that too may be because generator kept running for half an hour with full choke on because someone forgot to close the choke....just used sand paper to clean it ...haven't ran the generator after that yet ....
Your input would be needed on that...what can be the possible issue...changing spark plug would solve it or not ...btw the current spark plug is of Torch company ...dont know the part number