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Thread: What octane gas do you run in your 250r?

  1. 08-07-2003, 09:07 PM #16
    ATC350X 85
    ATC350X 85 is offline At The Back Of The Pack Arm chair racerFirst time rider
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    I used ATC 250R gaskets so everything is within factory specs. Almost everything on my R is OEM, the things that arent OEM were not put on it by me which is tires, air filter, handlebars, silencer, and a tether kill switch. I go with OEM cause in my opinion its best for it and my 250R is 90% original so thats my outlook on it, thanks MR ATC.
    Justin
    04 Trx 450r
    85 Atc 350x
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    98 Toyota Tacoma 4x4 xtra cab
    99 400ex, 97 xr400, 85 Atc 110, 86 Atc 200x, 85 Atc 350X, 87 Trx 250X, 86 Atc 250R (mint), 78 Atc 90 all sold
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  2. 08-08-2003, 09:35 AM #17
    TG
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    86 octane at stock bore n stroke 86 ATC250R Octane isnt only about compression, its mainly about heat. Cooler it runs, the less octane you need. But high comp does make it run hotter.
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  3. 08-08-2003, 11:46 AM #18
    Manny55
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    welcome TG
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  4. 08-09-2003, 05:22 PM #19
    85250Rfanatic
    85250Rfanatic is offline New to the board Arm chair racerNew to the board
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    I run 93 octane, Synnergyn Tcw3, 32:1
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  5. 08-10-2003, 12:19 PM #20
    TG
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    Thx, Manny. hopefully Ill get my bag-o-bolts runnign and see you guys on the oregon dunes.
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  6. 08-10-2003, 01:23 PM #21
    250rmanfmf's Avatar
    250rmanfmf
    250rmanfmf is offline Got The Holeshot Arm chair racerJust too addicted
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    Dont Forget Guys

    I run 110 race fuel, and dont forget what race fuel does. It takes heat out of the motor, like Avation fuel draws heat to the motor. I run 110 race fuel w/ Dumounde Tech Caster 32:1 mixure
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  7. 08-20-2003, 04:50 PM #22
    Eddie McApeshit
    Eddie McApeshit is offline Registered User New to the board
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    fuel additives

    Are there any fuel additives that are recommended & actually works with two strokes?
    86 250R
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  8. 08-21-2003, 11:24 AM #23
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    Jeb
    Jeb is offline Power User Teaching quads a lesson
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    I've never ran any fuel additives in my two strokes.

    I ran 92 Octane with Bel-Ray MC-1 or H1-R at 32:1 for years. A couple years ago, I started running 50:1. Now I'm running Blue Marble at 50:1. I run this in both my KXT and YTZ. You can bet I'll run the same in my R someday when I get her running!

    There's a formula anyone can use to make their own race gas. I need to look it up again as I've been meaning to try it. It was in DirtWheels or DirtBike (or both). All these years, I never have tried it. You go to the pump and mix a certain amount of 87 octane with a certain amount of 92 octane. Add some octane booster and hello high octane race gas.

    Maybe someone here has tried this or does this.
    1986 Tecate
    1984 Tecate
    1985 Tri-Z
    1986 ATC350X
    1985 ATC250R (2)
    1985 ATC125M (2)
    1982 ATC70 - Original Owner

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  9. 08-21-2003, 12:03 PM #24
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    TimSr
    TimSr is offline Banned The day begins with 3WW
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    I was using octane booster additive, probably bringing it up to about 95, because MY 250R wanted it (pinging), and running it in everything else that didint need it, because I use the same 2 stroke can for everything, with MC1 at 50:1. Since I switched to Blue Marble at 50:1, my 250R is happy without the octane booster.
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