Anyone know the premix ratio on a YZ250?

MxDaD324
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MxDaD324
Edited Date/Time 3/28/2012 12:43am
Because were heading to Daytona Smile

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slipdog
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slipdog 3/8/2012 8:06am
3/8/2012 8:06am
What's this premix you speak of ???
Arkmx
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Arkmx 3/8/2012 8:07am
3/8/2012 8:07am
.

32:1 (4 oz to a gallon of fuel) is a good starting point.

.
nc97
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nc97 3/8/2012 8:08am
3/8/2012 8:08am
Ive always went 32:1 ..
OW38B
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OW38B 3/8/2012 8:09am
3/8/2012 8:09am
Best of Luck to you! Braaaaaaaap!

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Cygnus
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Cygnus 3/8/2012 8:50am
3/8/2012 8:50am Edited Date/Time 3/8/2012 8:58am
40to1 motul 800 and leaded race gas. Yummy!
dv12.com
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dv12.com 3/8/2012 8:54am
3/8/2012 8:54am
Cygnus wrote:
40to1 motul 800.
Bingo. That's what I do on my YZ250. 32:1 is too much unless you ride it like Barcia... ;-)
Bob454
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Bob454 3/8/2012 8:59am
3/8/2012 8:59am
dv12.com wrote:
Bingo. That's what I do on my YZ250. 32:1 is too much unless you ride it like Barcia... ;-)
Hahaha to much??? Good advice Mr. Cobra.
WhKnuckle
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WhKnuckle 3/8/2012 9:07am
3/8/2012 9:07am
I run 32:1 on my son's YZ250 and my CR500AF. A little extra oil never hurt anything, maybe you get a bit of extra spooge from the pipe or etc...
dv12.com
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dv12.com 3/8/2012 9:11am
3/8/2012 9:11am
WhKnuckle wrote:
I run 32:1 on my son's YZ250 and my CR500AF. A little extra oil never hurt anything, maybe you get a bit of extra spooge from...
I run 32:1 on my son's YZ250 and my CR500AF. A little extra oil never hurt anything, maybe you get a bit of extra spooge from the pipe or etc...
Oil takes away octane from the gas. So in theorie, more oil, less octane, more detonation... I used to run 75:1 on YZ125 in SX only in the late 90s.
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IceMan446 3/8/2012 9:14am
3/8/2012 9:14am
WhKnuckle wrote:
I run 32:1 on my son's YZ250 and my CR500AF. A little extra oil never hurt anything, maybe you get a bit of extra spooge from...
I run 32:1 on my son's YZ250 and my CR500AF. A little extra oil never hurt anything, maybe you get a bit of extra spooge from the pipe or etc...
dv12.com wrote:
Oil takes away octane from the gas. So in theorie, more oil, less octane, more detonation... I used to run 75:1 on YZ125 in SX only...
Oil takes away octane from the gas. So in theorie, more oil, less octane, more detonation... I used to run 75:1 on YZ125 in SX only in the late 90s.
And the thing never blew up?
8686
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8686 3/8/2012 9:19am
3/8/2012 9:19am
I think we're missing the message here. Lol. Do you think he really needs to get everyone's opinion on his premix ratio?

Good luck at Daytona!!!!!
roughneck
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roughneck 3/8/2012 9:20am
3/8/2012 9:20am
110 race gas...That oil shit is over rated Blink who needs it
Torco1
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Torco1 3/8/2012 9:22am
3/8/2012 9:22am
WhKnuckle wrote:
I run 32:1 on my son's YZ250 and my CR500AF. A little extra oil never hurt anything, maybe you get a bit of extra spooge from...
I run 32:1 on my son's YZ250 and my CR500AF. A little extra oil never hurt anything, maybe you get a bit of extra spooge from the pipe or etc...
dv12.com wrote:
Oil takes away octane from the gas. So in theorie, more oil, less octane, more detonation... I used to run 75:1 on YZ125 in SX only...
Oil takes away octane from the gas. So in theorie, more oil, less octane, more detonation... I used to run 75:1 on YZ125 in SX only in the late 90s.
Most people don't realize that when you're talking about 2-stroke mixtures and being lean or rich, it's the fuel and air that affects that......not so much the oil. The oil is there as a lubricant and doesn't really affect the mixture. Like you said, the more oil you add the less fuel you'll have by volume which will make it leaner because the air amount will be greater in regards to the fuel.
dboivin
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dboivin 3/8/2012 9:23am
3/8/2012 9:23am Edited Date/Time 3/8/2012 9:23am
WhKnuckle wrote:
I run 32:1 on my son's YZ250 and my CR500AF. A little extra oil never hurt anything, maybe you get a bit of extra spooge from...
I run 32:1 on my son's YZ250 and my CR500AF. A little extra oil never hurt anything, maybe you get a bit of extra spooge from the pipe or etc...
dv12.com wrote:
Oil takes away octane from the gas. So in theorie, more oil, less octane, more detonation... I used to run 75:1 on YZ125 in SX only...
Oil takes away octane from the gas. So in theorie, more oil, less octane, more detonation... I used to run 75:1 on YZ125 in SX only in the late 90s.
IceMan446 wrote:
And the thing never blew up?
we been running 80:1 and sometimes 100:1 on snowmobile motors (2strokes) consistently. when suggested is somewhere down around 40:1 area. either oil has come a long ways or those ratios were just overkill to protect for failures. Smile
MxDaD324
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MxDaD324 3/8/2012 9:31am
3/8/2012 9:31am
8686 wrote:
I think we're missing the message here. Lol. Do you think he really needs to get everyone's opinion on his premix ratio? Good luck at Daytona...
I think we're missing the message here. Lol. Do you think he really needs to get everyone's opinion on his premix ratio?

Good luck at Daytona!!!!!
Haha!! EXACTLY!!

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P 3/8/2012 9:32am
3/8/2012 9:32am
Total Control Suspension! They do good work!


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MtnBoy
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MtnBoy 3/8/2012 9:34am
3/8/2012 9:34am
Good luck to you guys! If he's racing with the big boys I hope to see that sucker on TV Saturday night, if he's doing the amateur race I hope he makes all those guys that spent too much on 4-jokes look like fools!
steedmills 3/8/2012 9:34am
3/8/2012 9:34am Edited Date/Time 5/3/2012 12:54pm
Cygnus wrote:
40to1 motul 800 and leaded race gas. Yummy!
.
MxDaD324
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MxDaD324 3/8/2012 9:37am
3/8/2012 9:37am
MtnBoy wrote:
Good luck to you guys! If he's racing with the big boys I hope to see that sucker on TV Saturday night, if he's doing the...
Good luck to you guys! If he's racing with the big boys I hope to see that sucker on TV Saturday night, if he's doing the amateur race I hope he makes all those guys that spent too much on 4-jokes look like fools!
Thanks man!! The plan is to be on TV Saturday night!!
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mjskier 3/8/2012 9:41am
3/8/2012 9:41am Edited Date/Time 3/8/2012 10:05am
The oil is there as a lubricant and doesn't really affect the mixture.

Except the oil takes the place of gas, so all other things being equal, the more oil, the leaner the mixture, the more chances of seizing.
So basically, re-jet when you change the fuel/oil ratio.

Wait, I just read the end of your post. You basically said the same thing.
Arkmx
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Arkmx 3/8/2012 9:52am
3/8/2012 9:52am Edited Date/Time 3/8/2012 9:53am
dv12.com wrote:
Oil takes away octane from the gas. So in theorie, more oil, less octane, more detonation... I used to run 75:1 on YZ125 in SX only...
Oil takes away octane from the gas. So in theorie, more oil, less octane, more detonation... I used to run 75:1 on YZ125 in SX only in the late 90s.
.

DV,
As long as the Carb is jetted correctly (key wording here "jetted correctly") to accept this ratio it would be fine and of course some Race Gas would not hurt either!


Looking at the bike in the photo with a stock pipe on it, my guess there is not a lot of motor work done so a base mixture of 32:1 should be fine with stock jetting(?). Some race fuel ( VP C12 or equivalent) would be good too.

Good luck!

.
burn1986
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burn1986 3/8/2012 9:54am
3/8/2012 9:54am Edited Date/Time 3/8/2012 9:55am
40:1 BelRay H1R

32:1 PJI Goldfire
newmann
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newmann 3/8/2012 10:02am
3/8/2012 10:02am


Chain saws run forever on this stuff. Even doubles your warranty when you use it. Ever see a broken down Stihl??Wink 50 :1 and properly jet the puppy.


Bigger question for the 2 stroke crowd, when you rebuild a top end with fresh bore or plating do you slather everything up with oil for assembly or put it together dry?
reded
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reded 3/8/2012 10:07am
3/8/2012 10:07am
motomental1 wrote:
i thought premix was, for every 2 beers 1 water
Talk about buzzkill.......
reded
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reded 3/8/2012 10:08am
3/8/2012 10:08am
newmann wrote:
[img]http://appomattoxoutdoorequipment.com/images/engine_oil_hp_ultra_2.6oz_001.jpg[/img] Chain saws run forever on this stuff. Even doubles your warranty when you use it. Ever see a broken down Stihl??;) 50 :1 and properly...


Chain saws run forever on this stuff. Even doubles your warranty when you use it. Ever see a broken down Stihl??Wink 50 :1 and properly jet the puppy.


Bigger question for the 2 stroke crowd, when you rebuild a top end with fresh bore or plating do you slather everything up with oil for assembly or put it together dry?
I've done both, never noticed a difference in either method.

Anyone else?

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