Adjust the engine idle speed periodically on the engine at normal operating temperature.
To adjust the idle speed:

Engine oil and filter change
Throtile cable playEngine top side disassembly
It is unnecessary to remove the engine assembly from
the frame when servicing the cylinder head cover and
camshafts.
Note
before servicing the engine top side
components (until camshafts removal) with
the engine in place, remove the following
parts:
air cleaner box
...
Clutch cable play inspection and adjustment
Inspect clutch cable play
every 6 000 km (4 000 miles, 12 months)
Inspect and adjust the clutch cable play “a” as follows.
Clutch cable play “a”
10 – 15 mm (0.4 – 0.6 In)
Lift and support the fuel tank. Refer to “fuel tank
removal and installation” in section 1g (page 1g-
9).
  ...
Clutch removal
Drain engine oil. Refer to “engine oil and filter replacement” in
section 0b .
Lift and support the fuel tank with the prop stay.
Refer to “fuel tank removal and installation” in section 1g .
Disconnect the ckp sensor coupler (1).
Remove the clutch cover (2).
...