Well, I'm taking my 94 TW to Colorado for the 1st time next Saturday. My son and I have been meeting some guys from the CT90 forum for the last two years out there, this time I will be taking my TW as well as 2 CTs. Don't know what to expect, not re jetting or anything like that. We are going to go to Lake City and camping on Lake San Cristobal. Lake City is about 8400' and we will be getting to about 13000' over several passes. Will be riding the alpine loop and doing some in and out trails, been there before, it is really a beautiful area. I will post some pictures when I get back if I can figure out how to do it.
I just got back from there this weekend and will do a ride report once I get a chance to upload pics and videos. The engineer pass/cinnamon pass loop was beautiful! My 98 was pretty good below 9-10,000ft but above that it stuttered pretty bad but never fouled a plug the whole week. I definitely think the air box holes would help.