RE: How to adjust high and low speed needle valve on Evolution .46?
The Evo 46 has a blue collar on the Low-End needle that prevents it from moving too much.
Remove the collar, open the carb 1 millimeter and close the Low-End needle. Now, re-open it 1 1/5 (one and one fifth) turns. Replace the blue colar so it is centered between the stops.
This is where it is supposed to be set at the factory.