2005 king quad wont start

if the relay is clicking it sounds like a bad battery or starter

It's the low oil pressure warning lamp. It's suppose to come on at every start up. It will stay on for a couple seconds after the engine starts. This is normal.

Fuel starvation? Blocked breather on fuel filler cap. Try running it (be careful though) with the cap open to eliminate this cause.

It sound like you have a bad ground, what will happen if this is the case is you put you key in the ignition and turn to run "not starting the engine" and everything is on and bright, when you try to turn the engine over it will click once "just when the key hits the start position" and everything will shut off lights and all. if you take the key out and do it again it will produce the same results.

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check battery possible enough power for lights but not to turn over engine --try boosting to start

my guess is that your fuel pump is giving up on you. try hitting your gas tank on those days that wont start, best if you have somebody help you do it while the other try starting it

check battery is good with good cable contacts
check ignition swith is not worn out
replace starter motor

bad gas...caused carb contamination...probably water in the reserve part of the tank (which comes from ethanol separating in the gas...drain the tank (reserve side too)...open the drain screw on the bottom of the carb...re-fill and try again...

Sounds like passlock security failure.Park neatral swith located at top af transmission where shifter cable connects to trans,should be on drivers side.