Quote:
Originally Posted by jkv45
And that looks a lot better than stock! What size Main Jet are you running?
People just don't believe it could be possible that it's jetted RICH from the factory, and always want to increase the Main Jet size.
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I went down to 96 mains from factory 98. But that's not complete story because factory jetting is both lean AND rich.
With full exhaust, we pick up about 2.5hp. But is still leaving about 2.5hp on table due to super rich high-end. Lean mid-range is out of range for pilot-screw adjustment. Shimming stock needles just slides entire curve to left, making rich high-end occur sooner. Actual correction requires this.
Not obvious is Dynojet's needle is slightly thinner in midrange compared to stock and it adds fuel. Combined with fat thicker tip which removes high-end fuel. This combined with one size smaller jet reduces high-end fuel enough to pick up an additional 2.5hp for +5hp total over stock. Now we've got Ninja 300 power without the extra weight.
