Question about 2003 Yamaha YZ 250 F

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Do i have to mix 2 stroke oil on the gas for the 4 stroke bikes or just add regular gas on the tank? if is what is the scale for the mix?

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DO NOT mix oil in the gas on your four stroke engine. You will foul the spark plug(s), build up deposits on the valves and head, and make a smokey, smelly mess. A two stroke engine uses the fuel/oil mix to lubricate the engine before being used as fuel. A four stroke engine has a separate lubrication system and does not normally burn any oil. As the name implies, a two stroke engine works in two strokes. The first stroke is downward, where the fuel/oil mix and air are drawn into the cylinder. The momentum from the crankshaft counterbalance or force from the other cylinder(s) drive the piston back up compressing the mix, and the spark plug sparks at or slightly before the top of the stroke. The rapid combustion of the fuel/oil/air mix drives the piston down, which is the power stroke, and then the cycle starts all over again. A four stroke engine has an intake stroke down taking in the fuel/air mix, a compression stroke up, a power stroke down as the fuel/air mix is ignited at or before the top of the stroke, and a exhaust stroke up before starting all over again. A four stroke is much cleaner and more reliable than a two stroke, but it is heavier and has less torque. A two stroke engine is much lighter and has more torque, but takes more maintenance.

Posted on Feb 28, 2009

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That is great advice. I really agree, since it happened to me.

Posted on Mar 24, 2009

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1 Answer

I have a 1993 Honda 125cc was told to mix gas but these oil in crankcase do I need to mix?


You would never mix any fuel and oil for the crankcase. If it is a 2-stroke engine, the fuel and 2-stroke oil will need to be mixed before entering the cylinder. Some engines have an automatic mixing setup - those have a separate oil reservoir for 2-stroke oil, but it will usually be a plastic tank, located nowhere near the crankcase. On a "4matic" engine, it fires like a 4 stroke, but there is no crank case, and the fuel needs to be mixed like a 2 stroke. What is the vehicle you are referencing? A dirt bike or street bike? It seems the CR125 and NR125 are both 2 stroke engines, so somehow the fuel needs to be mixed with 2-stroke oil. Can you take a picture of the crankcase oil cap?

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1 Answer

Do i mix the gas or use straight gas


The answer is that ALL 2-stroke engines requires that you mix oil with the gas. ALL 4-stroke engines do not take oil in the gas. So the simple answer is if there is no place to add oil, then you have to mix oil in the gas - not the same kind of oil though! I don't know this particular model, but I have never seen a 4-stroke wearable leaf-blower. The kind on wheels could be either, but most (maybe all) are 4-stroke.

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I need to know the oil gas mixture for a 2000 yamaha pw90. I couldn't find my make and model so I just choose one so please ignor. It wouldn't let me continue without picking one.


If your model is the 90 then it should be a 4 stroke engine you put 10w30 or 10w40 oil in the engine and gas in the tank. Do not mix oil into the gas tank on a 4 stroker you will knacker the engine big time.

If however you have a definite 2 stroke model, you have 2 oil tanks one for the gearbox, and the plastic one under the seat for the engine.

Gearbox tank fill with 10w30 oil the plastic tank under the seat with 2 stroke oil. The 2 stroker mixes the oil and gas so you don't need to.

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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.

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I have a 1984 suzuki rm 125 it has always ran good for me. until recently it just putts and runs for maybe 20 secounds and then stalls. i tried to run start it and it kinda fired up but there was way more...


Are you mixing regular motor oil in the fuel? Doesn't this bike have a reservoir for 2-stroke oil? You must use 2-stroke oil in that reservoir. Buy it online if you can't find it locally.

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1 Answer

Was just given one of these with no manual.... what is the oil to gas ratio??


Is it a 2 stroke or 4 stroke? if it has a plug on the bottom above the blade to drain oil (look under the deck on the bottom of the engine) it is a 4 stroke and you do not mix gas / oil in this type of engine. It works just like your car, change the oil every 2 months and keep good gas in the tank. If the engine has no oil plug to drain oil it is a 2 stroke and you do need to mix the oil / gas. is should mix at a 1 to 32 ratio. use low ash oil.

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1 Answer

Possible seal failure


Gearbox oil may be getting into the crank area. Check the oil in the crank, is it motor oil or two stroke oil? If it is motor oil then you will need to split the center case and clean/re-seal the case halves. Be sure to install new crank seals. New crank bearings? If 2 stroke oil, just put a cup of gas in the crank to thin the oil, rotate the crank a few times to mix gas and oil, then just tip the bike over to dump the mix out of the case. If the bike has an oil pump, see if you can lessen the stroke of the pump. If mixing 2 stroke oil in the gas tank, Be sure to use only 2 stroke engine oil at 32 to 1 ratio. That equals 4 ounces of oil to a gallon of gas.

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If the motor is a two stroke, (and i am sure that it is), you need to stop riding until you fill the tank with TWO STROKE ENGINE OIL . Riding without oil will quickly cause the engine to seize up. If not using an automatic oil pump, then mix the gas and oil 32 to 1. That equals 4 ounces of TWO STROKE ENGINE OIL to one gallon of gas. NEVER use motor oil in the gas. Only two stroke engine oil.

Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell.

A “very helpful” rating for this answer? Thanks! < < And it doesn't cost anything extra!

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1 Answer

Type of gas


regular or unleaded are fine if it is a four stroke engine but if it is a two stroke engine you will need to fill an oil tank also with two stroke oil, or you may have to mix it in a can , see manufacturer for mix ratio.

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