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I have a stock 02 ZR8 that I installed 410 mains in. I rode the sled 150 miles this weekend & checked the plugs a few times. They didn't look as tan as I would have liked. Should I turn the fuel screws or leave them alone ? I ride at 1500 ft in NH & ME.
 

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Have an 02 zr 800 carb.  I went up to 450 mains with a power breather and gutted airbox.  This is good down to zero degrees.  I run in New Hampshire mostly and the sled gets 15 mpg faithfully have 461 miles on it.  I would say that you are probabbly a little lean.  I always jet for safety and this seems close. I would go up a few sizes.  Stock jetting is pretty close.  Unless you are racing leave it stock
 
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