The Great Debate… PREMIX

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10/28/2019 2:56 PM
Edited Date/Time: 10/29/2019 7:48 AM

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 3:00 PM

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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10/28/2019 3:15 PM
Edited Date/Time: 10/28/2019 3:16 PM

For me it's a 16 oz yamalube r and 5 gallon of cam2 ... been working for decades.

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10/28/2019 3:17 PM

Motul 800 seems to work well good for me

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If you like uncle tony's meatballs, you'll love his sausage

Now that's Italian

10/28/2019 3:18 PM
Edited Date/Time: 10/28/2019 3:19 PM

We have always run 32:1 in our Yamahas. Could we run 50:1? Probably

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10/28/2019 3:30 PM

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 3:32 PM

40:1 (125ml per 5litre) of Castor 927 in my 125.

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If talk is cheap, silence must be expensive because nobody can afford it!

10/28/2019 3:43 PM
Edited Date/Time: 10/28/2019 3:50 PM

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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10/28/2019 3:48 PM

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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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

80% of the time it works every time
IG @hammerfamily_4 & @2HRacing
Thanks to : Factory Effex, N2Dirt, Acerbis, DT1, Fasthouse, Matix, FMF, ASV, 100% & Mika Metals

10/28/2019 3:55 PM

I find that straight gas makes the most power

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10/28/2019 3:58 PM

Lightning78 wrote:

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.

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10/28/2019 4:01 PM

YZ125: 40:1
TE300 and TC250: 60:1

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10/28/2019 4:11 PM

kb228 wrote:

I find that straight gas makes the most power

Hell yeah

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10/28/2019 4:50 PM

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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10/28/2019 5:13 PM

T2.

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10/28/2019 5:32 PM

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.

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10/28/2019 5:59 PM

yz133rider wrote:

T2.

Just so easy and convenient

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10/28/2019 6:05 PM

2.5oz per gallon of Maxima, Bel Ray, Amsoil whatever.

Hard to go wrong unless you run weedwacker oil.

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2019 TX300
'10 200 XC-w

10/28/2019 6:07 PM

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.

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10/28/2019 6:20 PM

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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10/28/2019 6:21 PM

Ronnie_Gardner wrote:

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

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10/28/2019 6:23 PM

32:1 with Yamalube R. Never had a problem so why change?

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10/28/2019 7:01 PM

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.

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10/28/2019 7:08 PM

40:1 Maxima SuperM since '87 after leaving 50:1 Duralube behind.

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10/28/2019 7:14 PM

zehn wrote:

We have always run 32:1 in our Yamahas. Could we run 50:1? Probably

wreckitrandy wrote:

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

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10/28/2019 7:58 PM

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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10/28/2019 7:58 PM

SmokinJoe439 wrote:

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?

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James

10/28/2019 8:02 PM

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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James

10/28/2019 8:07 PM

Motul 800/VP110 at 48:1

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10/28/2019 8:11 PM

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?

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