Having just fought this battle, I'll weigh in.
Get a 75-80 main jet. Problem solved. We went from 40km/h max speed on the flat, back to around 70km/h+. Bikes runs clean throughout the rev range.
We have one bike with a 75, which is slightly faster than the bike with the 80. Excellent economy now - 350km before reserve
Stock main jet is 95.
Random info; Toyota jets fit just fine in the CGs. So, if you're struggling to get one that small, you can hit up a Toyota parts dealer.
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