Your engine idle speed should be 1350 +/- 50 rpms. The engine should be completely warmed when it is adjusted.
2000-3000 rpms is a common idle speed range for when the choke is on. They key is reducing the amount of choke (small increments) during the warm up until the bike can maintain a steady set idle speed on it's own. It is also acceptable to ride off with the choke on a short distance until the bike is warmed.
It is also common for the idle speed to change due to varying season (cold-hot) changes, so small idle adjustments may be necessary.
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