I've Officialy Joined the 2 Stroke Nuts

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12/29/2013 11:57 AM

Well my 450 bit the dust so I decided (with the wife's permission of course) to turn to the dark side and went and picked this 2013 Yz 250 up. The guy bought it for his son and his son wasn't quite ready to transition from the 125 so he decided to sell it for $4500.

Only bad thing is it's sprung for a 150lb rider so I'll be getting new springs then it'll be ready for the first ride. I took it for a test ride on the street and holy crap, it feels like it hits harder than the 450 did. The 450 was my first race bike so I'm sure I'm going to have a learning curve to go through. Just excited to get out and ride it. I race hare scrambles so I may end up getting a flywheel weight.

Got a couple of fuel mixture questions. The guy told me to run a 30:1 ratio. From what I can collect, that seems a little on the rich side. What are the pros and cons of running a rich mixture? Is there anything wrong with running it that rich? The previous owner has been running yamalube. Good brand or no? I know that may be suggestive. Just looking for a collective opinion. Also, how necessary is it to run a mix of premium and race fuel? It's been suggested that I mix a gallon of race fuel with 4 gallons of premium. My concern is I don't get to ride as often as I'd like and the race fuel will go bad faster than I can use it.

Hope you guys all had a Merry Christmas!!!

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12/29/2013 12:07 PM
Edited Date/Time: 12/29/2013 12:10 PM

The mixture ratio depends on the type of oil that you use. Some oils are more concentrated and use higher numerical ratios, and some oils are more viscous and require lower numerical ratios. The stock ratio is 32:1 with Yamalube R. I run Lucas at 28:1 because it is a light viscosity oil.

I recommend using 100LL in all two strokes. The YZ's and CR's are borderline on pump gas, and 100LL has the extra octane to keep them from pinging. You can buy 100LL for as little as $4.65/gal in Fort Worth. Plug your zip code into this fuel finder to find the cheapest prices near you. https://www.airnav.com/fuel/local.html

If you keep 100LL stored in an air tight steel container, it will last for years.

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12/29/2013 12:13 PM

Congrats, it's an awesome bike and I'm sure you'll love it. As far as the mixture question, you'll get a bunch of different answers and I'm sure all of them will work. If I were you, I would start with 32:1 using Yamalube and go from there.

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12/29/2013 12:15 PM

That's the beauty of the two stroke, it explodes and actually feels like its getting something done. Even though it's not as fast as your 450 it will feel like it is.

Yamalube is good oil. I've used it a lot and never had any problems. Pretty much any of the oils on the market today are good. I always ran it at 40:1 and jetted appropriately.

Lastly, keep your race fuel in a steel container and it will last quite a while.

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12/29/2013 12:18 PM

Yamalube is actually a really good oil. Yamalube and Hondaline oils are excellent options, at a very reasonable price. 32:! or 40:1 is the best mixtures, but if using an oil like Lucas (like CamP said), try their recommendation and work from there.

Cool bike! it will be very different when you jump or come out of corners with it for the first time! I love the 2 strokes but abandoned my 250SX after a few races having been on 4 strokes for so long. Some people adjust really well and I boner aired everything!

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12/29/2013 12:26 PM

That smell, can't you smell that smell…….

[LINK TO IMAGE]

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12/29/2013 12:27 PM

I'm running 40:1 (also YZ 250! best choice man)
Yamalube should be fine but I use Motul (just because of a dealer that sells it)
I also got a flywheel weight, works perfectly

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12/29/2013 12:56 PM

Spartacus wrote:

That smell, can't you smell that smell…….

[LINK TO IMAGE]

This is what I use - love the smell and its biodegradable. 32:1 in my YZ125 and YZ250. Do NOT run pump gas. Run something like VP Racing Gas "VPR"

http://motocrossactionmag.com/Main/News/RACERS-GUIDE-TO-THE-HIERARCHY-OF-MOTOCROSS-RACING-10439.aspx

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bd

12/29/2013 12:58 PM

congrats....now go hit the YZ 2 stroke forum over on thumpertalk....probably one of the most active forums, with years of threads on all of it....

suggested reading is the timing thread and the squish thread....

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12/29/2013 1:15 PM

40:1 Motul 800 2T

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12/29/2013 1:32 PM

Sweet ! Smoke it up. I run 32:1, klotz Beanol & VP C 12 smell like heaven.

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12/29/2013 1:33 PM

I run mine at 32 to 1. I use Redline, but oil is your call. I run BASE race fuel and my bike runs strong. Highly recommend the V-Force and an FMF Fatty. My bike ran very rich when stock so I rejetted leaner. As I added performance parts, it started running too lean. Now I'm back at stock jetting (except pilot jet still one size leaner from stock) and it runs great.

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12/29/2013 1:39 PM

kijen wrote:

congrats....now go hit the YZ 2 stroke forum over on thumpertalk....probably one of the most active forums, with years of threads on all of it....

suggested reading is the timing thread and the squish thread....

I just took a look at the two threads you referenced. I think it's going to take a lot of learning for me to learn what all that means. I believe I'll run av gas until I understand it all.

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12/29/2013 1:45 PM

Congrats on the sweet ride. I have always used golden spectro at 50 to 1 in my 250 and 40 to 1 in my 125s. Never had an issue. Everyone has their favorite and many are good. Good luck with the new ride. The stock pipe is very good and works well with a Boyesen Rad valve.

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12/29/2013 1:48 PM

So how do you know if your bike is running lean or rich? My guess is it smokes a lot when you run it rich? Not sure though.

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12/29/2013 1:51 PM

IWreckALot wrote:

So how do you know if your bike is running lean or rich? My guess is it smokes a lot when you run it rich? Not sure though.

The easiest way for me is to feel how the motor is responding to throttle inputs as well as how the motor sounds. It's pretty easy it just takes some experience.

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12/29/2013 2:07 PM

I run Maxima Formula K2 at 40:1, Top End looks perfect everytime I change it

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12/29/2013 2:08 PM

IWreckALot wrote:

So how do you know if your bike is running lean or rich? My guess is it smokes a lot when you run it rich? Not sure though.

Go directly to Jail. Do not pass go, do not collect $200.

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12/29/2013 2:12 PM

IWreckALot wrote:

So how do you know if your bike is running lean or rich? My guess is it smokes a lot when you run it rich? Not sure though.

sound. looking at the plug, checking to see if oil is pouring out the silencer. everything should burn a nice clean golden brown.

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12/29/2013 2:44 PM

Bytor wrote:

40:1 Motul 800 2T

Amen brother!! Try to find boat gas also.... It's cheaper than 'race gas' but without the ethanol content it has the same effect.

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Washed up moto and enduro weekend warrior.

12/29/2013 2:49 PM

Just broke into my son's RM85 to build a supermini after running Lucas for over 6 months. No cylinder marks, piston was nice on the sides. Only thing was a little bit of black carbon on head and piston, but we run pump gas (I'm sure that was what caused it). I like the fact that I can get it at O'Riliey's even on Sunday.

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12/29/2013 2:50 PM

So what is it that gives off that classic 2 stroke sweet smell? Is it the gas or a specific brand of oil. I've always run Yamalube but it smells very generic.

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12/29/2013 2:56 PM

MXD wrote:

So what is it that gives off that classic 2 stroke sweet smell? Is it the gas or a specific brand of oil. I've always run Yamalube but it smells very generic.

The 927... I use it for my line trimmer, only reason I enjoy doing the lawn.

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12/29/2013 2:57 PM

IWreckALot wrote:

So how do you know if your bike is running lean or rich? My guess is it smokes a lot when you run it rich? Not sure though.

Spartacus wrote:

Go directly to Jail. Do not pass go, do not collect $200.

I'm a two stroke noob. Give me a break man. Lol. I always steered clear of digging into the engine on my 450. I've got some buddies that know a few things about two strokes so I hope to start learning how to do just about everything I can myself. That's the biggest reason I made the switch. I wasn't happy about the $1,500 pill I was going to have to swallow when my 4 stroke gave it up.

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12/29/2013 3:01 PM

Oh and to clear up what I said, I know all two strokes smoke. . . I just figured they would smoke more than normal if it was running rich. I wasn't trying to say that I was hoping for a two stroke that doesn't smoke at all.

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12/29/2013 3:02 PM

IWreckALot wrote:

So how do you know if your bike is running lean or rich? My guess is it smokes a lot when you run it rich? Not sure though.

Spartacus wrote:

Go directly to Jail. Do not pass go, do not collect $200.

IWreckALot wrote:

I'm a two stroke noob. Give me a break man. Lol. I always steered clear of digging into the engine on my 450. I've got some buddies that know a few things about two strokes so I hope to start learning how to do just about everything I can myself. That's the biggest reason I made the switch. I wasn't happy about the $1,500 pill I was going to have to swallow when my 4 stroke gave it up.

It's $1500 if you catch it before gives up. It's about twice that if you let it go boom first.

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12/29/2013 3:03 PM

MXD wrote:

So what is it that gives off that classic 2 stroke sweet smell? Is it the gas or a specific brand of oil. I've always run Yamalube but it smells very generic.

EZZA 95B wrote:

The 927... I use it for my line trimmer, only reason I enjoy doing the lawn.

Is there anything special to know about using the 927? Should I mix it the same as I do the Yamalube? Does it burn dirty or clean? Because I hate cleaning power valves LOL

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12/29/2013 3:04 PM

Sweet bike man, what's the plan for the 450?

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12/29/2013 3:15 PM

just run fresh premium unleaded and jet it properly, if it still pings then do 50/50 race gas and premium. I read a really good article regarding avgas and i will try to look for it. I never really understood the avgas thing and what the article said was even though it is 100 octane it doesn't use the same formula as automobile fuel. when using the the automobile formula such as RON, the octane number is actually lower than 91. what you do get is no ethanol and lead which the 2 stroke will love!

I know there are a lot of opinions on this and i am not trying to say i am right and others are wrong, but, there is a shit ton of info out there on all these subjects and none of them are right or wrong!

welcome to the darkside now go out and rip it! remember keep your momentum up and you don't worry about a 450 having more power and all that crap!

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Never try to argue with idiots; they will only bring you down to their level.....and being more experienced, they will beat you at their own game!


2006 KX250

12/29/2013 3:19 PM

MXD wrote:

So what is it that gives off that classic 2 stroke sweet smell? Is it the gas or a specific brand of oil. I've always run Yamalube but it smells very generic.

EZZA 95B wrote:

The 927... I use it for my line trimmer, only reason I enjoy doing the lawn.

MXD wrote:

Is there anything special to know about using the 927? Should I mix it the same as I do the Yamalube? Does it burn dirty or clean? Because I hate cleaning power valves LOL

Stick with Yamalube.

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