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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
where did mr2 go?
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[QUOTE="MikeS, post: 1215043, member: 18813"] In my findings a custom Vortex ignition is sweet on a 124 or 144. Using a good fuel like MR2 was or now U2 I actually retarded the timing some and got better top end power. Running a tight squish or small chamber would help throttle response and give a better burn without the need for aggressive advance that the factory uses to light off pump fuel. I played roulette since I would drop the main until it popped on a straight then when up a size. As far as trying to enhance the U2 fuel by blending, I have added a tail to it to get better piston cooling, the old U4 actually worked well for us, just rain my last batch of U4 today. Anyway if you can scrub some timing and a tad of octane requirement I would look at adding some VP MS105L as it will raise the tail, not kill your octane and almost hold your throttle response... MR9 will work too but watch your detonation. I found I never needed much over 100 MON in our motors (actually 92-96MON has been enough). [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
where did mr2 go?
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