I've only got about 60 miles on, mag side in nice brown, PTO is black, and machine is very burbly below 6000, reminds me of an old zirt6. I think I may have a problem with the PTO side carb, dirt,etc. There was some shipping crap in the airbox below the shelf, and it may have injested some before I found it, or possibly choke is hanging up. Switched carb tops to rule out t-flow first, just haven't had a chance to run it since. Got air and fuel screws both at 2 turns out, seems not bad, idle not hanging anymore, and yes they were off.
FYI Barry doesn't recommend airbox mods with the t-flow, however I am unsure why-when not vented in the box it should be OK. On sleds using airbox venting I could understand how it could cause probs. AC900, hows your plugs/wash with the 450's and what elev are you at? Thanks for the replies, Austin