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mr12 jetting

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From experience using the fuel in road racers I'll give you some tips.

The fuel runs much richer on the main than the pilot.

With u4.4 I went up 1 on the pilot and 1 on the main. Big increase in power.

With mr12 (which I haven't used in my 250f this is just advice based on my experience in road racers) I'd start with 1 up on the pilot and 2 on the main, then tune from there. Mr12 is amazing once you are tuned for it. Someday I'm going to grab 5 gallons to play with it in my 250f, I'm just not fast enough to justify it yet.

I hope someone that has actually used the fuel in a 250f chimes in as I am really curious as to how much more fuel we need using this stuff.

Hope I helped some!

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