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Fuel, compression mostly.
I had 13 to1 pistons, plus .010 cut off the block top. That head was stock so my cranking compression was 220 psi.
I used 114 octane fuel and tuned it on the dyno. I kept adding timing and fuel.
With stock carbs and 117 main jets I was at 33-34 hp.
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Top speed 123.369mph. Ohio mile
Worlds fastest 250 ninja
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