My kawasaki zr 550cc is all of a sudden not starting, please help...would it be the fuse???Light switches on but no igition/power at all (bike is new to me) cheers

Check the switch itself for bad contacts with a 12volt bulb with long leads on it. Put one connection on the bike chassis and the other will make the bulb light up when you have a live wire and go out when the wire or switch contact is faulty.
Hope this helps.

Check you main jets ccccccthey could need a good wiring through with needle wire cleaners or try running it without any air cleaner unit .If it runs well then could be an air filter problem.

every 3 to 5 thousand miles depending on how much the bike is hammered...

It is likely that youve popped a fuse
The battery would have to be totalled to behave like that
But it sounds like the battery isnt being charged properly. Make sure the voltage across the batt terminals is at least 13.5v at tickover rising to no more than 15.5v at higher revs
Make sure the battery connections are TIGHT as well
Ride-Safe
Bike-Doc

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make sure when you check the oil that the bike has been sitting on the centre stand for about twenty minutes or so before you check it as there is still alot of oil in the cylinder head and oil coolers etc,sitting the bike will let the oil drain back to the sump and give you a correct reading,try this and see how you go,hope this helps

Plug gaps are incorrect. They are too tight. The gap of a plug has direct effect to ignition timing. Too tight and timing is advanced. Too fat and timing is retarded. use a decent wire gapping guage (not the 99cent key chain gapper) tool is a FEELER guage not force guage. gapped right and your problems solved.

sounds like bad gas.