I am gonna pick up a 2007 yz 250 this weekend, i have a 18 250sx and i run that at 60:1, i know that isn’t gonna fly with that yamaha. What ratios are you guys running in that?
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YZ 250 smoker
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32:1. Rips. Stock jetting is based for 32:1. If you go 40:1 or 50:1 it will effect the jetting pretty noticeably.
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You'd probably be fine running that with todays oils, I have run 50:1 in my YZ from day 1 and I'm at almost 200 hours now (rebuild every 50 hours, crank at 150). Oil ratios are like favorite colors though, nobody is ever going to agree and will go with what they were taught until the day they die. If it worked in the KTM there's really no reason I'm aware of that it wouldn't work in the YZ, there isn't any major fundamental difference in how they function.
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40:1 straight c12 on my 05 and it rips!
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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F
80% of the time it works every time
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50:1 Redline, Tom Morgan recommended on my build. Only ran 32:1 petrol based for break in. As long as you run good quality oil (I prefer synthetic), correctly jet, good gas, and clean air you will be good.
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40:1 on my 2007 YZ250. I must say that I am pretty slow. I rev the shit out of it before the gate drops, then after the first turn... eh, not so much. :-)
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I run 40:1 with 927, but this bike is setup as a grunt machine (11oz FWW, FMF Fatty) so I don't often wring it out.
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32:1 is perfect. I believe the manual says 28:1 which is pretty heavy. The oil is lubricant for your motor so I wouldn’t skimp out
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Stuntman949 wrote:
32:1 Yamalube 2R
Gotta run Yamalube 2R. Only other stuff I'll run is SuperM if Yamalube isn't available
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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F
80% of the time it works every time
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Been running YZ's since the mid 80's. Started with Super-M at 40:1 but with the power valve era, have been running Honda HP-2 since it first came out. 32:1, perfect. Not a motocross action guy, but this is has been a go to for jetting.
https://motocrossactionmag.com/mxa-wrench-tech-yamaha-yz250-two-stroke-jetting-from-1999-to-2014-2/
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Stuntman949 wrote:
32:1 Yamalube 2R
mattyhamz2 wrote:
Gotta run Yamalube 2R. Only other stuff I'll run is SuperM if Yamalube isn't available
I ran it for one top end as a test and went right back to Lucas. I can pick Lucas down the street at the auto parts store and it runs cleaner, no reason to use the 2R.
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I bought and raced a new YZ250 in the vet classes every year 2008-2015. Ran maxima 927 32:1 with 93 octane pump gas and never had an issue. Stock jetting. Pro circuit pipe and silencer, vforce reeds. Get the suspension dialed in for yourself and you have a race ready machine. Bulletproof. reliability on the YZ250 is second to none
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Also not sure if pro circuit still has any in the rafters somewhere but back in like 2009 or so I was able to score a special YZ250 “reed bend” works pipe. Matthes mentioned it on pulp once and sure enough it was legit thing.... And sure enough I wadded the pipe up a short time later at broome tioga in New York. Rock smashed a baseball size dent in it
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MX114 wrote:
Also not sure if pro circuit still has any in the rafters somewhere but back in like 2009 or so I was able to score a special YZ250 “reed bend” works pipe. Matthes mentioned it on pulp once and sure enough it was legit thing.... And sure enough I wadded the pipe up a short time later at broome tioga in New York. Rock smashed a baseball size dent in it
Send it to pipe repair!
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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F
80% of the time it works every time
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Travis_Hudson wrote:
Hp2 and Yamaha r2 is the exact same oil from the same supplier with a different dye.....just in case there is a shortage of Honda oil or which is cheaper at the moment. Just FYI.
Really? Then please explain this.
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