What octane gas do you use with your premix?

Question

Hello, I have question for Yamaha YZ490 owners. What octane gas do you use with your premix? Regular or Premium? Thank you for answers.

Warner Lane 7 years 26 Answers 2652 views 0

Answers ( 26 )

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    Premium 91 octane

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    Premium always no she’ll gas or gasoline with alcohol in it . Washes the oil away. EC2

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    Lukes oil pretty good bean oil castor smells bitchen.messy though.

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    Premium at least.

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    Premium always. 93 octane or higher if available.

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    I’ve always ran Cam 2 purple with Yamalube 2r at 32/1, never had a problem.

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    VP C-12 always

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    1 gallon of 110 car race gas to 1 gallon of 91 octane premium (preferably without Methanol) – some specialty places have it like Lube/oil wholesalers. = 103 octane! Perfect even if U dont do the head mods + I can also run Higher timing !!

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    Personally I run Sunoco 110 leaded with Klotz R50 36:1. The gas is readily available in my area. Unleaded gas in a 2 stroke is not a problem but the ethanol in it is a problem cause it absorbs moisture. Don’t leave it sitting in your carb!

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      we actually have 1 station in a small town 10 miles from me that carries the “Non-Ethanol” premium. But its only 91 octane.

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      That’s all you need.

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    If you can get it they love 101 LL AV gas.

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      I found AV gas to run cooler and race gas to run perkier. Search AV gas and U will find that its octane rating isn’t equal to Gas octane ratings AND its designed for higher elevations. I was amazed at the difference between Race Gas and AV gas ! Search Av Gas vs race gas fyi, if U want. I do know Race gas burns a lot hotter so on the 490/500 U best not putt around all day being air cooled, lol. I can also run higher timing on race gas which is supposed to be a big no-no on these bikes.

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      I live in Denver, I don’t run it, but vp100 works fine at this elevation too. 110 starts pinging pretty quick.

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      I do agree 110 is just too high and too hot for an air-cooled rare bike to run. Also a lot to do with all this is where U live too.and what is available.

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      100 octane , yamalube R 32:1

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      Bill Sharp if it’s pinging, it ain’t because of the gas! OMG!

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      Well Dan I dont no shit but i do know it don’t do it with 100octane? I think it’s pinging cuz it’s hot cuz?

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    My 92 WR 500 large owners manual says 95 octane or higher = FYI and its basically an 89 YZ 490 engine.

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    I run AVgas. 100 octane. I buy it at the airport 2 miles from home.

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    In other words pump gas won’t do!

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    Well I feel silly. Lol. I’ve been using 86. Better add some octane booster!

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    All I run is pump gas. All I have ever ran is pump gas. Ive been riding 2 strokes since I was about 13 years old and now Im 45. If you get motor work and require higher octane then thats a different story. But I have had a KX250 with a MaxPower 310 stroker kit. Most recent bikes. 06CR250. 2000KX500. 2011YZ250 and other bikes I have owned in my life.. I have never had a problem running pump gas. But if spending $10 a gal makes you feel better.

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      Touché.

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      Listen to who you want but all the guys who have these bikes say 93 octanes or more.

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      I run pump gas in everything else I have, just not my 490 that has a high compression head. I also use AVgas in machines I don’t ride very often because it has a 3 year lifespan. It’s $4.60 a gallon.

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