I have a 2017 Apollo RX250 with the Mikuni VM26. I think if you are at an elevation of 50-950 ft these settings should be good. I have no issues with this set up, and the bike is stock.
* Pilot Jet - 27.5
* Needle Clip - Middle setting (slot 3)
* Main Jet - 120
* Air Screw is about 2 1/2 - 2 5/8 turns out.
* Float was not adjusted from factory setting
Hope this helps,
Douglass
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