The Great Debate… PREMIX

10/28/2019 2:56pm Edited Date/Time 10/31/2019 4:43am
This has probably been discussed 1000 times, but do you premix to the bike’s manual spec, or to the premix oil spec? 04 YZ125 calls for 30:1. I use Motorex in my Husky TX300 at 60:1

EDIT: Lets see exactly what people run in their bikes!

Year Make Model
Mix Ratio, Oil You use

2017 Husky TX300
60:1 Motorex 2T

2004 Yamaha YZ125
32:1 Motorex 2T
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10/28/2019 3:00pm
That's because Yamaha hasn't updated it's premix ratio guide in its owners manual since like the late 70's. Today's oils are so much better now.

I have run for years in my 06 yz250 50:1 on 927 and on my 06 yz144 40:1 on 927.
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zippytech
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Bethesda, OH US
10/28/2019 3:15pm Edited Date/Time 10/28/2019 3:16pm
For me it's a 16 oz yamalube r and 5 gallon of cam2 ... been working for decades.
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Uncle Tony
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New York, NY US
10/28/2019 3:17pm
Motul 800 seems to work well good for me
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zehn
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Anchorage, AK US
10/28/2019 3:18pm Edited Date/Time 10/28/2019 3:19pm
We have always run 32:1 in our Yamahas. Could we run 50:1? Probably
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The Shop

Lightning78
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Huntington Beach, CA US
10/28/2019 3:30pm
Does a 125 typically benefit from having more oil in the premix compared to a 250 because of the higher revs and because the bike stays pinned linger with a decent rider on it?
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10/28/2019 3:32pm
40:1 (125ml per 5litre) of Castor 927 in my 125.
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jbrown15
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10/28/2019 3:43pm Edited Date/Time 10/28/2019 3:50pm
Run Maxima K2 and 32:1 in my son’s mod YZ85 and his YZ Supermini as per our engine builder. Engines run strong with no extra spooge.

Both bikes have been jetted to run at 32:1 of course.
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mattyhamz2
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10/28/2019 3:48pm
40:1 in every 2 stroke we've ever owned!

Obviously jetting plays a part in what you should be mixing it at.
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kb228
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Mansfield, OH US
10/28/2019 3:55pm
I find that straight gas makes the most power
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10/28/2019 3:58pm
Does a 125 typically benefit from having more oil in the premix compared to a 250 because of the higher revs and because the bike stays...
Does a 125 typically benefit from having more oil in the premix compared to a 250 because of the higher revs and because the bike stays pinned linger with a decent rider on it?
Yes. I was running my 150 at 24:1 with Motul 800 and she was a rocket and the crank didn’t need to be replaced at 30 hours. Did it anyway.
crusty_xx
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10/28/2019 4:01pm
YZ125: 40:1
TE300 and TC250: 60:1
zehn
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10/28/2019 4:11pm
kb228 wrote:
I find that straight gas makes the most power
Hell yeah
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loftyair
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riverside, CA US
10/28/2019 4:50pm
I do crazy mathematical equations. Air temp, pressure, elevation, engine rpm, track condition. Alot more. Put it all in my super-computer, then add 2 drops/gal., just to be safe.
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bonseff
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Frisco, TX US
10/28/2019 5:32pm
32:1 927 since forever, creature of habit I suppose, as long as the plug is chocolate milk color, I'm good.
50:1 927 in the lawn edger.
+1 Ratio Rite, you the best.
3
Hcallz5
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UT US
10/28/2019 6:05pm
2.5oz per gallon of Maxima, Bel Ray, Amsoil whatever.

Hard to go wrong unless you run weedwacker oil.
fanger
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AU
10/28/2019 6:07pm
kb228 wrote:
I find that straight gas makes the most power
13 year old me can confirm this, can also confirm dad wasn’t happy when the piston was stuck to the barrel.
10/28/2019 6:20pm
Depends on what oil, some synthetic oils are 100÷1,that's what I'm currently doing, was 40÷1 with bel ray, runs the same either way
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zehn
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10/28/2019 6:21pm
Depends on what oil, some synthetic oils are 100÷1,that's what I'm currently doing, was 40÷1 with bel ray, runs the same either way
Damn, you run 100:1? I've never heard of anybody doing that, crazy
Moto520
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Schaumburg, IL US
10/28/2019 6:23pm
32:1 with Yamalube R. Never had a problem so why change?
wreckitrandy
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Granite Falls, NC US
10/28/2019 7:01pm
zehn wrote:
We have always run 32:1 in our Yamahas. Could we run 50:1? Probably
Yes sir, you could. You could drive your truck down the road two quarts low of oil as well.
dimetime
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Huntington Beach, CA US
10/28/2019 7:08pm
40:1 Maxima SuperM since '87 after leaving 50:1 Duralube behind.
1
zehn
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Anchorage, AK US
10/28/2019 7:14pm
zehn wrote:
We have always run 32:1 in our Yamahas. Could we run 50:1? Probably
Yes sir, you could. You could drive your truck down the road two quarts low of oil as well.
What about the guy running 100:1?

That's like running your truck low 4 quarts of oil
mikec265
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Edinboro, PA US
10/28/2019 7:58pm
I'm guessing the 60:1 probably has a thicker viscosity than something meant to be mixed at 32:1. That's the only thing that makes sense to me.
I do remember buying a quart of cheap 2 cycle oil when I was 13ish and it was like water compared to the viscosity of the MC1 that I used at the time. I run Amsoil Dominator at 40:1 and never have a problem. You can use plenty of different oils at different ratios and still be fine. Just run good stuff.
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SoCalMX70
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Thousand Oaks, CA US
10/28/2019 7:58pm
That's because Yamaha hasn't updated it's premix ratio guide in its owners manual since like the late 70's. Today's oils are so much better now. I...
That's because Yamaha hasn't updated it's premix ratio guide in its owners manual since like the late 70's. Today's oils are so much better now.

I have run for years in my 06 yz250 50:1 on 927 and on my 06 yz144 40:1 on 927.
So, they migrate faster?
SoCalMX70
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Thousand Oaks, CA US
10/28/2019 8:02pm
32:1 in a 125, at least 40:1 in a 250.

I run 32:1 in my 250 with either 927 or K2. Jetted perfect, runs crisp. I also appreciate the free HP and that my crank will probably last 300 hours (looking at you, 100:1 nut jobs).
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omalley
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Snohomish, WA US
10/28/2019 8:07pm
Motul 800/VP110 at 48:1
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brocster
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Aliso Viejo, CA US
10/28/2019 8:11pm
Speaking of oil at 40:1, what oil smells best. I run 927 but I know there is better. What oil burns at the unique smell that we all love?
10/28/2019 8:15pm
brocster wrote:
Speaking of oil at 40:1, what oil smells best. I run 927 but I know there is better. What oil burns at the unique smell that...
Speaking of oil at 40:1, what oil smells best. I run 927 but I know there is better. What oil burns at the unique smell that we all love?
Klotz smells pretty damn good. Motul 800 smells nice too
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