0-1000ft./190main
1000-2000ft./187main
2000-3000ft./185main
3000-3500ft./180main
3500-4500ft./178main
i tend to run a little rich, plug is always a touch grey/black rather than that grey/brown,but it runs extremely good and really fast with the parts i've chosen to run . i also run a 50 pilot/slow as well as being about 2.5 (+or- .25)turns out on the a/f screw. conditions in weather can make a difference in what mains i run aswell small adjustments to the screw.

 

I can't remember for sure but I was thinking Four-Stroke Tech(Mickey Dunlop)did a 500 Plus with water cooled head they made themselves.

 

that would be a one-of-a-kind ,not a kit. most anything past a 440,465cc would be considered custom or one-of i would think. exept for maybe a xr500 cylinder/adapter of some kind.