RE: Moki 2.10 running lean when pointed up
Cold air is more dense than warm air. It necessarily requires a richer setting.
The solution to your problem is not to run the needle for MAX rpm. Not only in the cool
weather, but in any weather.
The engine will lean out when it's 120F outside just as it would when it's 20F.
Conservative needle settings are the ticket. Tune for peak, then back off a few hundred rpm
'Race