40:1?

40Plus_922mx
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40Plus_922mx
Edited Date/Time 8/13/2012 5:59pm
Ok so as I go through this entire bike I am happily surprised and reminded how basic the smokers are to work on. I am real curious as to mix ratios. I rode smokers for two decades and used 927 40:1 in every bike with zero failures. What would you run, and what ratio? I am 200lbs, slowing down to now about novice. these days. I ride mostly Racetown395' Comp edge, Milestone. 03 yz 250

Thanks guys.
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FIREfish148
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FIREfish148 8/12/2012 2:34am
8/12/2012 2:34am
40:1 was always the magic number for me.
FGR01
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FGR01 8/12/2012 2:39am
8/12/2012 2:39am
My experience with 927 has not been good. Previous owner of my YZ250 ran it. It took me about 2 days to remove all the caked up carbon and packing from the silencer. It might run good but it clogs everything up. I run Super-M at 32:1. I tried 40:1 but it richened the bike up and caused spooge. If you run 40:1 you might need to lean the jets a bit.
KICKERMAN360 8/12/2012 4:52am
8/12/2012 4:52am
I do 32:1. Never fowled a plug whilst riding. I guess it depends on how you ride and what you ride. I know my friend fowled 3 plugs on a brand new YZ125 because he wasn't giving it enough (Running 40:1 on that bike).
dirtbikersa 8/12/2012 4:53am
8/12/2012 4:53am
Just curious FGR01 - How does 40:1 make a bike run richer than 32:1? 32:1 is higher oil to fuel ratio.

The Shop

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motox731tuner 8/12/2012 5:18am
8/12/2012 5:18am
dirtbikersa wrote:
Just curious FGR01 - How does 40:1 make a bike run richer than 32:1? 32:1 is higher oil to fuel ratio.
The more oil in your fuel thickens it, which in turn flows less fuel through carb. Less fuel to air equals a leaner burn.
project racer 8/12/2012 5:51am
8/12/2012 5:51am
dirtbikersa wrote:
Just curious FGR01 - How does 40:1 make a bike run richer than 32:1? 32:1 is higher oil to fuel ratio.
motox731tuner wrote:
The more oil in your fuel thickens it, which in turn flows less fuel through carb. Less fuel to air equals a leaner burn.
Yes. An oil rich mixture occurs as more oil is introduced to the fuel. That leans the actual carburetion metering settings.
MR. X
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MR. X 8/12/2012 6:31am
8/12/2012 6:31am
He said it caused spooge though , gas doesnt spooge , to much oil does.
FGR01
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FGR01 8/12/2012 6:58am
8/12/2012 6:58am
Not true. Rich jetting, i.e. too much gas, contributes to spooge.

Like others have said, when you lean out the gas/oil ratio (less oil) you are actually richening the gas/air ratio (more gas).

When your gas/air ratio is rich you have a cooler and less complete combustion which results in a lower exhaust gas temperature which is the main cause of spooge.

When I change from 40:1 to 32:1 on my YZ125 and YZ250 I can even see the blue/orange color on the bare pipes extend further down the pipe from the increased exhaust temp.
Falcon
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Falcon 8/12/2012 8:18am
8/12/2012 8:18am
40:1 is great if you run a really good oil. 927 ranks right up there, but like the others have said it causes a gummy buildup. That's the nature of castor.
I run Bel-Ray H1-R at 40:1 with great results in my YZ250.
4stroke4DWIN
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4stroke4DWIN 8/12/2012 8:27am
8/12/2012 8:27am
I run 32:1 in both my kids race bikes, I tried 40:1 and it ran like shit, waaaay to rich. Lot of it has to do with oil, some run good on 40:1
40Plus_922mx
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40Plus_922mx 8/12/2012 9:11am
8/12/2012 9:11am
Thanks guys!
I know this bike was raced pro level (probably amature pro) As the suspension has fork tube stickers from 03, with heavier springs, and valving, and an AMA frame sticker on the stem. Also had a hole shot device. Then it sat for like a year out in the sun in Havasu. Then a 17 yr old kid rode it around barely off idle trail riding. So the spooge was insane all down the rear brake master and swing arm. He also ran 40:1 which I thought would cut down on the spooge. In this case I can see how it would actually contribute. I will ride the bike like it's meant to be ridden.

I think I started using 927 back in 1990 when I went riding with a friend and loved the smell. LoL. But I have heard that it does leave gunk behind. My brother in law poppd the motor on his old 91 KDX200 (man that was a fune playbike) and he told me the cylinder and pistion had crap all over it.

BAMX
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BAMX 8/12/2012 9:23am
8/12/2012 9:23am
927 is fine but after using both Redline and Motorex systhetics, I would never go back. The motor and exhaust valves are just way cleaner using the synthetics. As or the ratio, I remember reading an article where Dick Lechein said that all of his oils were meant to run 32:1. I was a long time ago so maybe Maxima has newer stuff that has higher ratios. Back then they had 927 and Super M.
2strokerider 8/12/2012 10:24am
8/12/2012 10:24am
depends on the quality of oil you are using- we run motul 800 factory line at 50:1 in both my yz 125 and my rm 250. Most decent ester based fully synthetic oils are recommended to use between 40 and 50:1 - just jet it to suit.

ktm recommend 60:1 in their 2 strokes dont they? (using motorex fully syth 2 stroke oil)
munsch121
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munsch121 8/12/2012 10:29am
8/12/2012 10:29am
I wouldn't bother with 927, I made the switch to H1R and never looked back, burns super clean and always ran 40-1
NorcalVet
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NorcalVet 8/12/2012 10:30am
8/12/2012 10:30am Edited Date/Time 8/12/2012 10:32am
I run 32-1 (927) in my RM 250 w/ 100 octane VP pump gas from a local 76 Station

runs perfect, no spooge at all...............Smells sweeeeet

** Supposedly more power from 32-1 then 40-1 bikes on Dyno
"quoted by a Master rider/ mechanic from our club"
YZBooster
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YZBooster 8/12/2012 10:43am
8/12/2012 10:43am
40Plus_922mx wrote:
Thanks guys! I know this bike was raced pro level (probably amature pro) As the suspension has fork tube stickers from 03, with heavier springs, and...
Thanks guys!
I know this bike was raced pro level (probably amature pro) As the suspension has fork tube stickers from 03, with heavier springs, and valving, and an AMA frame sticker on the stem. Also had a hole shot device. Then it sat for like a year out in the sun in Havasu. Then a 17 yr old kid rode it around barely off idle trail riding. So the spooge was insane all down the rear brake master and swing arm. He also ran 40:1 which I thought would cut down on the spooge. In this case I can see how it would actually contribute. I will ride the bike like it's meant to be ridden.

I think I started using 927 back in 1990 when I went riding with a friend and loved the smell. LoL. But I have heard that it does leave gunk behind. My brother in law poppd the motor on his old 91 KDX200 (man that was a fune playbike) and he told me the cylinder and pistion had crap all over it.

Hey 40+
As long as you have it torn down, be sure to check under the chain guide on top of the swingarm. Make sure the chain isn't carving a canyon!
snowy816
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snowy816 8/12/2012 4:02pm
8/12/2012 4:02pm
dirtbikersa wrote:
Just curious FGR01 - How does 40:1 make a bike run richer than 32:1? 32:1 is higher oil to fuel ratio.
When I got my PC RM250 they reccomended 32:1 however I was running 114octane VP race fuel too..
theycallmeebryan 8/12/2012 4:09pm
8/12/2012 4:09pm
Klotz Benol 32:1 and Jet the bike properly. Mine runs like a raped ape, no spooge, crisp as hell, smells great too!

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CR500Rider
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CR500Rider 8/12/2012 4:53pm
8/12/2012 4:53pm
I've used Yamalube mixed at 40:1 since the 70's with zero lubrication failures.
machine
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machine 8/12/2012 5:01pm
8/12/2012 5:01pm
I've always ran 50:1 in my bikes with motul 800t. It's "thicker" out of the bottle than some other oils, so you can run higher ratio numbers. KTM recommended 60:1 in the owners manual for my 09 250SX with motorex, but i didn't have the balls to try it.
T-Fish
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T-Fish 8/12/2012 7:07pm
8/12/2012 7:07pm
machine wrote:
I've always ran 50:1 in my bikes with motul 800t. It's "thicker" out of the bottle than some other oils, so you can run higher ratio...
I've always ran 50:1 in my bikes with motul 800t. It's "thicker" out of the bottle than some other oils, so you can run higher ratio numbers. KTM recommended 60:1 in the owners manual for my 09 250SX with motorex, but i didn't have the balls to try it.
I saw that in my '09 SX manual and thought it was a misprint, until I checked elsewhere.

Like you, I've been too chicken to try 60:1.

I go 40:1 or 50:1 using AVGAS, depending on the bike.
mxjef
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mxjef 8/12/2012 7:18pm
8/12/2012 7:18pm
Yamalube 32:1 is what I run in my '08 RM250.

Doesn't leave any dirty crap in the power valve.

Been using it in all my bikes since the early 80's, never had a problem.
mag23
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mag23 8/12/2012 7:46pm
8/12/2012 7:46pm
I use vp ultimate 4.4 and 927 at 32:1, with no issues on my 150sx...
seth505
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seth505 8/12/2012 7:49pm
8/12/2012 7:49pm
Hell yes, I run 40:1 Amsoil in my yz250 and rm125
dirtbikersa 8/13/2012 12:00am
8/13/2012 12:00am
Some good info. I run 40:1 Motul 800 but just recently got some Maxima 927 that I am going to try. Motul is getting ridiculously expensive.
mx757
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mx757 8/13/2012 12:40am
8/13/2012 12:40am
I had my 05 YZ250 and 06YZ125 running at 44:1 on Amsoil Dominator. My bikes always ran super strong, and never had a motor failure. I ran the same top end for 2 years with 30+ races a year in the 250, and still no problems. Thing ran awesome.
40Plus_922mx
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40Plus_922mx 8/13/2012 1:21am
8/13/2012 1:21am
40Plus_922mx wrote:
Thanks guys! I know this bike was raced pro level (probably amature pro) As the suspension has fork tube stickers from 03, with heavier springs, and...
Thanks guys!
I know this bike was raced pro level (probably amature pro) As the suspension has fork tube stickers from 03, with heavier springs, and valving, and an AMA frame sticker on the stem. Also had a hole shot device. Then it sat for like a year out in the sun in Havasu. Then a 17 yr old kid rode it around barely off idle trail riding. So the spooge was insane all down the rear brake master and swing arm. He also ran 40:1 which I thought would cut down on the spooge. In this case I can see how it would actually contribute. I will ride the bike like it's meant to be ridden.

I think I started using 927 back in 1990 when I went riding with a friend and loved the smell. LoL. But I have heard that it does leave gunk behind. My brother in law poppd the motor on his old 91 KDX200 (man that was a fune playbike) and he told me the cylinder and pistion had crap all over it.

YZBooster wrote:
Hey 40+ As long as you have it torn down, be sure to check under the chain guide on top of the swingarm. Make sure the...
Hey 40+
As long as you have it torn down, be sure to check under the chain guide on top of the swingarm. Make sure the chain isn't carving a canyon!
Oh yes
dirtbikersa 8/13/2012 1:41am
8/13/2012 1:41am Edited Date/Time 8/13/2012 5:49am
.
Kartwheel84c
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Kartwheel84c 8/13/2012 1:54am
8/13/2012 1:54am
I am always baffled by the claims that 927 causes buildup. I've used it at 32:1 since the early 80s in everything from 125s to 500s and never had anything like the gunk buildup people claim. I think the problem is if your bike is not jetted properly and is too rich the liquid castor bean oil will build up, where an oil like H1R will not, it will stay liquid and not build up. I recently rebuilt my '79 Maico 440 that had been run a lot for 4 years on 927 and it had virtually no buildup on the piston crown or anywhere else for that matter. I run it in all 28 of my bikes and every one of them have bone dry dark grey exhaust, but they all have spotless jetting too.
E-man811
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E-man811 8/13/2012 5:34am
8/13/2012 5:34am
Kartwheel84c wrote:
I am always baffled by the claims that 927 causes buildup. I've used it at 32:1 since the early 80s in everything from 125s to 500s...
I am always baffled by the claims that 927 causes buildup. I've used it at 32:1 since the early 80s in everything from 125s to 500s and never had anything like the gunk buildup people claim. I think the problem is if your bike is not jetted properly and is too rich the liquid castor bean oil will build up, where an oil like H1R will not, it will stay liquid and not build up. I recently rebuilt my '79 Maico 440 that had been run a lot for 4 years on 927 and it had virtually no buildup on the piston crown or anywhere else for that matter. I run it in all 28 of my bikes and every one of them have bone dry dark grey exhaust, but they all have spotless jetting too.
28 bikes? ! ? ! ?

Holy shit.

(pouting while kicking my pathetic wallet down the street)

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