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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
where did mr2 go?
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[QUOTE="MikeS, post: 1214449, member: 18813"] Well since I am a self proclaimed VP guru of sorts.. Why would you want to mix those fuels ? What path of logic are you basing getting more power? I am not being smart arsed. MR2 was always a very good fuel for a 2 stroke. It was a tad over kill on octane for some and was trick to jet, it was also AMA legal in the extra 02 it carried. The Pro series fuels are UnLeaded and are supposed to carry the O2 for performance. The Pro series fuels are pricey since VP has to source out some components to get the fuel to perform properly. For years it has been easy to blend up race fuel with low cost components and add TEL and then MTBE. . The U2 or U4 are just the next generation of the MR2 series... the MR9 and MR are really the ticket for 250 4 strokes but you pay for the specialized components that are used to gain performance. Back to your quest, Theoretically U2 should provide the best power for your money as it carries up to 6% oxygen into the mix. U4 has a better distillation curve for a hi revving 2 stroke IMO and still carries good oxygen. I have found it stable as long as you keep it cool and out of the sun. Mixing MR2 and U2 or U4 will only increase the octane some and lower the overall amount of Oxygen. I have added MR8 to U4 only to bring up the octane when running on that ragged edge with our old 125.. I have tested U4, U2, MR2, MR8, C12, And a few other brands at both the track and on a dyno in these bikes KTM300, KTM250SX, TM125/125, CRF250/262. All I can say is that the race fuel makes more power and torque verses pump fuel once you get and adjust timing/curves. NONE of these fuels by themselves broke that magic 2 hp number consistently but they did add 1 hp + some foot pounds or so down early in the rpm range that the rider can feel. [/QUOTE]
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where did mr2 go?
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