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

Is my 81 ts185 a 2 or 4 stroke. Everyone is telling me different things. The bike is older than me. I would assume 2 stroke. But I'm not sure. Please help me.


Deffinately 2 stroke there should be a small oil tank under the seat or one of the side covers. If not mix oil it in fuel tank at 20:1 Regards Jim. Suzuki Technition.

Mar 16, 2015 | Motorcycles

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?

Feb 04, 2015 | Honda Motorcycles

1 Answer

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.

Jul 04, 2011 | Power Baghira Street Moto Motorcycles

3 Answers

How much oil do I ideally put into a full gas tank on my 2 stroke Kymco Like 50? can you put too much?


Hi, not familiar with this bike,does it not have a separate oil tank,?, if your machine is pre mix this means you mix the correct amount of oil and fuel together as. Single form of lubrication, this way the oil gets directly to the engine parts, when the fuel,oil,and air mixture enter the engine the spark ignights it and the engine running process is started, the mixture is atomized to a form of mist, to much oil would render the mist to sticky, and seizure may occure from overheating, as would also be the case for to little oil, MY RESEARCH DOES NOT COME UP WITH A 4T 2 STROKE
ONLY A 4 STROKE WHICH OBVOUSLY HAS NO OIL ADDED TO THE PETROL.

May 30, 2011 | 2010 Kymco Like 50 4T

2 Answers

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.

Aug 22, 2010 | Suzuki RM 125 Motorcycles

2 Answers

What happens if you dont mix oil into the gas?


You blow up. Depends, does your bike have oil injection? Then you don't have to mix the oil in the gas, If it doesn't, then you will have to mix it in the tank. No lubrication in your engine, and I will give it about 10 mins before it seizes up from heat. And don't try to sneak motor oil in there in a pinch, because it won't work. Motor oil compared to 2 stoke oil is like 40 grit sandpaper to a babies ****. I'm talking rough. I use 2 stoke for everything, it is super lube. Hope this helps.

Mar 08, 2010 | 2004 kawasaki KLX 125 L

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.

Nov 18, 2009 | 2000 Husqvarna WR 250

3 Answers

I need oil for yamaha tri-moto 175


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!

Jun 18, 2009 | 2005 Yamaha Royal Star Tour Deluxe

1 Answer

Well since it's a 4 stroke I can't mix it with the gas. I drained out all the old oil and I just need to know the correct porportion of oil to re add to my bike


The proportion is 100% oil, don't mix it with anything. Put in two quarts, stand the bike straight up and check the oil. Add one half quart at a time until it registers full on the stick or in the sight glass.

Mar 09, 2009 | 1991 Yamaha XT 600 E

1 Answer

Oil


40:1 fuel mix ratio is good for this model. you put gas in the upper tank and 2 stroke oil in lower tank the mix pump will do the mix, if you are not sure the pump is working properly, mix 4 ounces of 2 stroke oil into 1 gallon of gasoline and put the mix in the upper tank, it reach the carburator by gravity

Nov 20, 2008 | 2005 Honda Dio

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