How to change and check oil? - Yamaha 2012 YFZ 450

What sort of noise was it? Does the noise change with the throttle or with road speed?
First check your oil levels. I'm not sure if the prowler engine shares engine oil with the gearbox or is a separate oil system. A dry gearbox can make a lot of noise AND do a lot of damage.
If the noise changes with the throttle, ( not moving and revving the engine), it could be engine issues. If the noise only happens when your moving it could be gearbox or the drive parts to the wheels.

Video shows how to change oil but show how to check also
https://www.youtube.com/watch?v=Eh-dFgxpn8s
owners manual page 83
https://www.manualslib.com/manual/1122066/Kawasaki-Mule-610-4x4-Xc.html?page=82

Being a 2012, I am sure it is fuel injected and not carbureted, so I am sure that there would be no fuel in there. I truly doubt that oil would be in there unless this crash was violent enough to crack a block or head. If it were mine, I would check the oil level, if good, start it and run to operating temperature. Then turn it off and let cool to cold, check oil level, as well as check coolant. If the coolant looks lime green(if it uses green coolant) and not chocolate milkshake brown, I would say you are good to go!

when changing oil usually you change the oil filter and there is a drain plug for the oil to out...i don't know bout the reservoir your talking about,,

Is it full at present? If so, drain the oil and measure the volume.
If you are changing the oil it might a good idea to change the filter as well. Before you begin, run the engine for a few minutes to heat up and thin the oil so that it runs out easily.

That is equivalent to a "Check Engine" light, meaning that a condition exists which requires attention. Check all fluid levels, and readout codes from the ECU as a starting point for diagnosis.

That's sounds strange?
Oil can only leak out or the engine is burning it.?
If its burning your oil valve stem seals are worn it lets oil into your combustion chamber and burn it.
Maybe get a local mechanic to take a look.
Good luck

1600ml is the Arctic Cat recommended amount BUT if you check the KYMCO manual (the '06 250 is a kymco made for AC) it says the capacity is 1600ml but when you change oil it is 1400ml. This might explain why my oil level always seems higher than it should be. You can check the level with the site glass on the side.

Also on the 250, you also have to change transmission fluid separately. It uses the gear oil NOT engine oil.

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If the oil is milky it has a bad and leaking seal somewhere that the gas is gitting in, or it has water in it. Water does not mix well with oil as you may know so I'd guess its gas is getting in. If it does run, change the oil right away then see if the oil develops the milky look again. Probably a seal would be my guess. Good luck.