The way my bike is geared 1st is really only for speeds up to 15-20Kmh, after that you use 2nd, so 1st you really don't need except for pulling away or to get some bite out of unusually tight uphill hairpin. Also if you overtake on the bike you shouldn't usually need to shift gears in an overtake. Start the overtake in whatever gear you are in at in the torque band at 5,-6,000 rpm and then wind the bike up to 8-9,000 to pass the vehicle, should be OK.
Also jet kits sound complex, in reality if you understand a flush toilet and a water pistol, you understand a carb. Use a narrower jet at higher altitudes, or a lower octane number. Don't let it stress you out unless you are above 1,500 meters plus all the roadside mechanics probably have jets that you might need. Pull out the jet look for a tiny number, and on the net find the number for the one that is one less for above 1,500 meters.
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