Fuel amd Oil Mixture

[RedB66]

I was just watching a video on Youtube on the subject of setting the carb to run lean or more rich. Over the years there have been numerous threads and questions on this subject. So....heres one more... or two.

Wouldn't you have to be precise on your fuel to oil mixture? I for one mix my gas 1 gallon at a time using a gallon container and 2 cycle oil bottle with the 2oz. increments on the side.

Could lean or rich conditions be achieved by pouring what I think is a gallon of gas from my 5 gallon can and adding what I think is the correct amount of oil. How precise does it need to be? Is it an exact science?

If I check my plug and I notice it is running lean, could it be remedied by using more oil on the next batch. Or vice versa with rich conditions?

It makes sence to me that a consistant mix will rusult in consistant performance but, how much is it effected by being off the mark?

[Venice Motor Bikes]

I haven't had much of a problem with the mixture being a little off...

[bairdco]

i've got a two gallon can that's just slightly bigger than 2 gallons. seem like everytime i fill it up it costs $6.66.

so i get more or less 2 gallons, then dump in more or less 2 oz. of Opti 2 for a more or less 100:1 ratio, and shake it up.

i'm never 100% accurate, and my bike doesn't seem to notice the difference, and neither do i.

[Gareth]

Here is a good primer on tuning..

Carburetor Theory and Tuning :: Two Stroke Motocross

The more oil, the less gas = leaner mix.

[Bikeguy Joe]

Yes, you can adjust your mixture with the gas to oil ratio.

16:1 is twice as much oil as 32:1, so varying the ratio from 16-50:1 would be one way of "adjusting" the fuel mix to air ratio.

It does make a difference when you experiment, try it if you don't believe me.

[Bikeguy Joe]

Originally Posted by RedB66

If I check my plug and I notice it is running lean, could it be remedied by using more oil on the next batch. Or vice versa with rich conditions?

If it's lean, and you add MORE oil, you will get a grinding sound followed by silence.

More oil will make the mixture of fuel to air LEANER.

[FileStyle]

Originally Posted by Bikeguy Joe

If it's lean, and you add MORE oil, you will get a grinding sound followed by silence.

More oil will make the mixture of fuel to air LEANER.

would'nt more oil make the mix rich instead of lean?
less oil would make it run lean! follwed by the grinding sound then silence.

[Xiodinc]

whats the best oil mixture after it is broken in?

[BarelyAWake]

Originally Posted by FileStyle

would'nt more oil make the mix rich instead of lean?
less oil would make it run lean! follwed by the grinding sound then silence.

This again? o.O

What joe's talkin about is gasoline & air mix - if you have more oil, you have less gasoline thus "lean"... less oil = more gasoline & "rich".

It's actually more complex than it sounds, by adjusting the mix via carb - your fuel air mix (fuel being both oil and gas) changes, by diddling around with your oil ratio - yer messing with the gasoline/air mix... it is actually a different thing.

How much of an effect too much oil (running lean on gasoline for the sake of lubrication) has on the potential for seizure... well... the jury is still out on that 'un but it'll defo lead to ignition woes

[Bikeguy Joe]

Somewhere between 32:1 and 40:1 is a good ratio once broken in. A lot of guys are running 50:1 synthetic with good results.

Yes, more oil in the gasoline to oil mix will make the engine run leaner fuel to air wise.
Too much oil is as bad (in a different way) than too little oil.
Too much oil will make a lot of carbon build up, sticking rings, plugging exhausts, ect. If it's waaay to much, you probably will not sieze your engine, right away, but it's best to be careful and mix you oil into your gasoline ACCURATELY.

There's no reason not to.