Just try the needle on the top clip and ensure the idle screw is low (as per Jakobi) and the start the air screw at 1 1/2.
I have found this the best jetting for a 2011 EC300 with the 38mm carb and the stock 0.5mm base gasket. I ride at similar alt and temps. It is almost unstallable and linear in power.
__________________
EC300 2019 (11 Gassers owned, many more to go)
|