Premix Ratio

[peski111]

The big reason people run 32:1 instead of the 30:1 as the manual recommends is because the RATIO-RITE measuring cup has 32:1 but NOT 30:1 on the side measurements. 

[barleydog]

In my opinion you should stick to what the bike calls for.I hear people say that if you use this oil,you can mix 40 to 1 or 50 to 1.When you start using less oil you make your engine run rich.Your bike is jetted for a certain mixture,and changing it might mean re-jetting your bike.If your plug is golden brown,then just stick to a 30 to 1 mixture.If it is black then try a 35 to 1 mixture.

[94yz]

Does anyone know what ratio to run on a 94 yz250? When I google it all I can find are people's opinions and they tend to vary very alot between people. Should I run 32:1 ? I dnt have the original manual for my bike.

[MANIAC998]

Does anyone know what ratio to run on a 94 yz250? When I google it all I can find are people's opinions and they tend to vary very alot between people. Should I run 32:1 ? I dnt have the original manual for my bike.

Like you've noticed, everyone has there own pre-mix ratio that they use. You can't go wrong with 32:1 in my opinion

[94yz]

Ok

[YZDOC]

R2 32:1 is what I run in all three of my 2002 YZ250's. Long discussion with an old Baja 500/1000 racer just yesterday about it. He always ran Spectro 50:1. your gas is the oil carrier and keeps the engine cooler the amount of oil between all the ratios is a moot point. It all depends on jetting and speeds traveled. It all is dead on than the bike will last for many hours. He ran Baja quite a bit back in the day and did an easy 200 hours on a top end and 300-400 on the bottom. This was all back in the day of air cooled Husqvarnas and early water cooled. He still recommends 50:1 even in my YZ's, but I would have to do the jetting ritual all over again, none of my YZ's are the same even with same years. 

 

So, what I am saying, is run what works best and jet according to ratio, altitude, temperature. 

[94yz]

Ok I was looking for a starting point I'm new to 2 strokes and just dnt wanna mix it wrong and blow it up. But thank you very much for the information

[zotis777]

Unless you go super extreme lean it won't cause harm. My stepbrother once accidentally ran 128:1 in an 85 and its okay. Start where you want (i say 32:1, easy to mix, common) but don't be paranoid about it

[94yz]

Do u guys use mixing cup

[94yz]

One of these

[MANIAC998]

YUP!

[Andrew13]

To chime back in. I ran 35:1 this past weekend out and the excess blue smoke disappeared. Bike ran great and had no issues. I am going to stick with 35:1. 

 

Thanks all

[MXRider72]

If you're using a ratio rite it's not hard to figure out how to do 30:1 using the cc measurements rather than the ratio measurements.

With a stock engine and jetting my 13 runs great at 30:1 with Yamalube 2R and VP C9 fuel.

Edited May 12, 2014 by MXRider72