Thanks very much everyone for the extra info. Benny I was aware of the 40s and 45s being different in how they hold teh chokes in (for want of a beter explanation) but didn't know which was which off the top of my head. If I'm not mistaken, the 40 dcoe 2s are sort of like the equivalent of the 45 dcoe 9s in terms of them being the pick of the litter, the best choices (for each respective size) with regards to tuneability specifically for competition stuff. I know there's some differences in the idle/transition holes on the other models, and speaking broadly the emissions ones are the ones to generally avoid.

Would it be possible to know where in Japan you sourced them from? (and in fairness I understand if it's not something you want to disclose for any reason)

If I could also enquire - with the switch to e85, was there much trouble finding a good 'match' as far as emulsion tubes go? and I'm also not expecting you do divulge precisely what ones you ended up with, just whether or not it was a big drama getting ones that worked well with e85. Did you have any other issues as far as e85 and it's friendliness to any particular carb internals?