Jetting for higher altitude

[Gasaholic]

Any suggestions for base jetting ? will be based at about 8000 ft and riding up to 12,000 over passes but basicly riding 8000 to 9500 ft. Riding 2011 EC300 with RB kit done to carb. Anyone have experience at this altitude?
Thanks in advance.

[jeffs2200]

I will be up in the Taylor park area with my Gasser the 18th thru the 24th. Last year I ran the n3ch 1st clip, 42, and I think I ended up with a 155 or maybe even a 152 main. I need to look and see if I wrote it down. I remember it would not rev out so I went to the next lower main and that did the trick.

[Gasaholic]

Thanks for the fast response, will be in that area from 24th to 31st of Aug. Will try those ,thanks again.