Fuel Recommendation

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1/24/2018 12:21 PM

No, this isn’t the ordinary “should I run race fuel” thread, lol...
I am sending my 02 CR250R cylinder and head to PC for porting and head mods. In speaking with them, they recommend VP C12 for fuel, but said that they can tailor it (porting/head) to VP110 instead of I’d like, but that I would notice a difference in power (lower with the 110 I presume). The rub is that the 110 is about 10.00/gal vs 20.00/gal for C12.
I am an over 40 intermediate at best. Mainly I want improved spread in the power vs stock. On one hand I don’t want to spend an extra 10.00/gal, but the flip side is I’m willing to do so if the difference is noticeable, particularly in breadth of power and/or usability.

Anyone have experience with either or both?

FWIW, bike has a Vforce, PC works pipe/factory 304 (full length) and I have both the stock TMX and a JD Keihin airstriker to play with.

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1/24/2018 12:36 PM

You pay to play man. If youre doing that kind of motor work then yea you need to run the race gas. If it were me, id go with the 110. I also run race gas but im not paying no $20/gallon regardless of mods.

Have you tried a flywheel weight? That smooths out the power

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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

1/24/2018 1:33 PM

C10 is an unleaded 100 octane race fuel. C12 is 112.5 octane leaded race fuel. I personally run C12 in my bike and shifter kart and have zero problems with it. I noticed a big difference in performance when I switched to C12 from CAM2 and TurboBlue race fuels and have not gone back.

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2018 KTM 250sx
Instagram CamaroAJ

1/24/2018 1:37 PM

I would skip both and try the vp T2 fuel. It's got oil, mtbe and lead.... All good things 2 strokes like.

Once you get to 110 octane leaded, you are building in major compression to get the most from it

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1/24/2018 7:11 PM

I agree with Bruce. T2 is 105 R+M/2, and 101 Mon. PC should have no problem setting it up for that.

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1/25/2018 6:09 AM
Edited Date/Time: 1/25/2018 6:16 AM

Thanks for the info everyone. I should’ve been more clear. My only two consistently available choices locally (that I’ve been able to find) are VP110 and C12. I don’t have an issue buying the 110 at 10/gal, but the 20/gal (for C12) gives me pause unless the difference between what PC can do with each is significant. My gut is telling me that the big difference would be between a pump gas build and either of my choices, not as much between the two race gas options.

Unfortunately in the time I’ve stepped away from riding it seems that race fuel has gotten harder to come by in my area.

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1/25/2018 3:46 PM

That's crazy C12 is $20/gallon. I remember paying $5/gallon back in the day.

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1/25/2018 4:07 PM

Braaaphole wrote:

That's crazy C12 is $20/gallon. I remember paying $5/gallon back in the day.

Everything was cheaper back in the day. Had a friend mod a motor, then complained on$20-30 gallon for pro6. Yea drop $$on motor mods and complain on fuel prices. Makes sense. The same type of dude that complains. His 90k. SUV gets 13mpg.

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1/27/2018 5:32 AM

I would not go for the C12, just go with the lower cost race fuel. I paid $124 for 5 gallons of MRX02 about 3 years ago. I sure as hell hope someone is ripping you off at $20 per gallon. I also bought U4.4 at $76 at the same time.

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1/28/2018 2:15 PM

If you haven't looked...search out circle track suppliers or even call any local oval race track. Our local racecar parts supplier carries Sunuco 110 and 112. 110 is about $8-$9 a gallon ! Some local Sunco stations also carry it.. I useit in my 2 strokes and it makes power and last without going stale or varnishing. I see http://evergreenspeedway.com/ is near you and I'd visit or call them for race fuel sources. Where theres race cars their be race fuel...and no $20 gallon.
Another source,,
small and sons in auburn has 3 flavors at the pump. 106 114 and 119 octane. 1725 Auburn Way N. Auburn, WA 98071 http://smallandsonsoil.com/racefuels/trick_race_fuels.php


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1/28/2018 4:18 PM

Braaaphole wrote:

That's crazy C12 is $20/gallon. I remember paying $5/gallon back in the day.

mxb2 wrote:

Everything was cheaper back in the day. Had a friend mod a motor, then complained on$20-30 gallon for pro6. Yea drop $$on motor mods and complain on fuel prices. Makes sense. The same type of dude that complains. His 90k. SUV gets 13mpg.

We all use C12 in our 2 strokes ,haven't found anything that runs nearly as good. But at $20/gal someone is tearing your eyelids off. I pay $ 62 for a 5 gal can. Just bought one last week. You need to find a new source.

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1/28/2018 6:04 PM

You may want to read up on gasoline characteristics. Just because it is high octane does not mean it is the best for the very short intake tract of a dirt bike.

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1/28/2018 6:28 PM

Have you considered mixing pump with 110? I do a 50/50 mix and it works well for my application (TX300 with an RKTek head).

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