Do not rule out the STIC metering block for your Keihin as an option as well.
I installed the STIC on my 2018 Gas Gas 250 a couple of weeks ago and just got the jetting dialed yesterday. I was a little skeptical at the beginning, but after getting the jetting correct I am very impressed. I rode the bike yesterday with temperatures from mid 70's to mid 90's and elevations from 4000' to 7,500'. Bike ran cleanly all day.
I will write a more thorough review when I have a chance.
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