Hmmm...
I can't help with anything but the gearing question. In order to do 1st and 2nd gear power wheelies and cruise comfortably at 70 m.p.h. you'll need to buy yet antoher engine, maybe a really new, cutting edge one that has been designed in the last 20 years.
But seriously , 15/42 seems like a pretty good all around gearing on my u.s. model 1989 xt600. I think Klaus recommends 15/40 for 3ajs and earlier but I think that is due to reducing 5th gear wear? So it might not be needed to go this low on a later engine, due to stronger 5th gear. I would go with 15/42 if you are using a newer gearbox.
HTH,
Nate
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