I have a monsoon atv 125 cc I think I put some mixed gas in it it was running before it was low on gas this morning and I just grabbed a gas can what should I do

There are manuals on line for your ATV

It's a four stroke, just use straight gas.

If it's a 2-stroke where you mix gas & oil or has a separate oil tank under the seat that you fill to mix with the gas ... you don't change the oil. 2-stroke engines don't generally have oil in the crankcase, they're oiled with the fuel they run on (which is mixed with oil). What model ATV do you have?

I mix mine 50 to 1

Do you mix oil into the gas?? Is there a place to check the oil (a dip stick). Is there a special place to put 2 cycle oil for a self mixer?

If you don't mix the gas with oil and there is no special place to put 2 cycle oil, you have a 4 cycle engine.

If there is a place on the side to check the oil level, you have a 4 cycle engine.

Next question will be ... how do I check the transmission oil? If you have a 4 cycle engine, the engine oil is also the transmission oil ... rule of thumb.

You are showing a picture of a motorcycle and asking a question about a ATV, but not mentioning a model number. I don't think Yamaha is currently making a 2 stroke engine for their ATV's (there are several sizes - not including assorted models for sale around the world ... and I don't know where you are writing from (and please don't say).

Maybe the best thing for you to do is call the Yamaha dealer on Monday morning and tell them the model you have and ask the question 2 stroke or 4 stroke. There will be no more guessing on your part then.

Make sense?

Thanks for your question @ FixYa.com

You are going to need more information before you start this up.
You need to know whether it is 2-stroke or 4-stroke.
You need to know the manufacturer, I see some use 25 parts gasoline to 1 part 2-stroke oil. Other machines use a different proportion.
If it is this manufacturer, mix say 25 ounces of gas with 1 ounce of 2-stroke oil in a separate container and pour into gas tank.
If it is 4-stroke, you will need oil in the crankcase, not in the fuel tank.
Try to find the name of the bike/quad somewhere.

Don't use stabil. Use a modern synthetic saw oil (50:1 fuel to oil ratio) available at home centers, hardware stores, and saw dealers. Mix the oil and fuel in it's own container and be sure to shake the container thoroughly just before filling the tank each time to prevent oil starvation. If it becomes apparent that the carburetor adjustments are wrong, you will need to see your dealer for adjustment. Good luck!

I WOULD USE AMSOIL,OR RED LINE SYNTHETIC OIL ( WILL MAKE TOP END LAST ALOT LONGER).. AND THE MIX IS 32:1..... AND FOR ENGINE/TRANY OIL YOU CAN USE BEL-RAY ( BEST IN MY OPINION)

yes - all gas motors need oil in the crank case - it should say on the engine either ( cc or ll ) for the amount of oil to put in - 20-40 oil type.

best to mix it (premix) in a separate can & forget the autolube pump. Mix 1 pint 2-cycle oil (Yamaha 2-R) to 5 gals of gas.