Looking for a specific jetting guide

Rides520

XS400 Enthusiast
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Tucson
There's a guide out there with a pink background or pink writing maybe some blue font as well near the top. It's a race tuning guide and it says that step number 1 is figuring out your main jet and working down. It recommends finding the smallest main with best combination of rev speed a pull. I can't find this website at all anymore. Any one out there have a hot tip.
 
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