Huh?
Methinks Patrick has never taken a good look at his XT600?
The XT/TT/Tenere 600 and 660 have the YDIS system. Yamaha dual intake system. Means, there's two carbs, each feeding one of the inlet ports. The slide on the first is operated by the cable, the second one by vacuum. Although, at about 1/3 turn of the throttle the valve downstream of the second slide is opened, creating an air flow, vacuum and causing the second carb to kick in.
There's no definite engine speed at which the second carb kicks in. You'll have to remove the tank to see when the throttle starts opening the valve in the second carb.
You'll be easier on the gas as:
- second carb is for the higher speed / power regions. Low speed makes for low consumption
- second carb is set richer than the first, lowering consumption
Auke
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