How much oil do i put in my 2004 yamaha yz250 2 stroke?

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Yamaha 2004 Banshee Base

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

20w40 four stroke engine oil,
car oils will cause clutch slip
the semi synthetic and full synthetic are better oils but cost more.
Change the oil often, it only holds a bit over a litre

20w40 motorcycle oil,(the same as four strokes use) car oils have friction modifiers in them that will make the clutch slip

Do you have to mix oil and gas or is there a separate tank for oil?

drain the fuel, locate the float bowl drain screw, lowest screw on the carb and loosen it to drain the carb. replace the fuel with proper pre-mix, replace the spark plug and it should be fine