There are "starter formulas" that I have seen and as I recall, you go up one jet size (main and pilot) for the headers and one more for the air boxes. That's just a guess, then you tune it from there.
As to where to get them? You might try Bike bandit and see if the available OEM jets go up in size (they do for my 750).
There are also rejetting kits for a lot of bikes, the KZ1000 is so popular I would not be surprised if there were some for it. The internet search key is your best friend.
As to where to get them? You might try Bike bandit and see if the available OEM jets go up in size (they do for my 750).
There are also rejetting kits for a lot of bikes, the KZ1000 is so popular I would not be surprised if there were some for it. The internet search key is your best friend.