Check the condition of the front coupling dogs of the gears. They must be in perfect condition and with no sign of wear on the edges of the teeth.
The idler gears must rotate freely on their shafts.
When refitting, make sure the circlips are correctly positioned.
Check the needle roller bearings for wear.
The threads and splines of the shafts must be in perfect condition.
Also check that the component parts of the gear selector mechanism are in good condition.
Engage

Engage the gears and check that the gearchange mechanism does not stick (selector fork - gear groove, and fork pin - desmodromic drum groove) due to incorrect end float. Restore the correct end float by shimming the gearbox shafts and the selector drum with suitable shims.
For the total gearbox shaft and selector drum end clearance values, refer to sect. 3 - 1.1, Gearbox.
Disassembly of the gearbox shafts
Inspection of the gear selector forksDisassembly of the oil pump
Hold the oil pump (1) in a vice taking care not to damage the drive gear
(12).
Warning
Make sure that vice jaws are faced with soft material.
Remove the plug (14) and extract the spring (16) and by-pass valve (17).
Check the condition of the above components.
Remove the circlip (6) ...
Steering head: steering
Screw
Steering head
Screw
Lower rh u-bolt
Lower lh u-bolt
Bearing
Screw
Sealing ring
Washer
Spacer
Washer
Nut
Washer
Screw
Bottom yoke
Dowel
Nut
Screw
Special screw
Clip nut
Left-hand support
Front splashguard
Right-hand support
Front support
S ...
Dashboard on tank
Menu 1 (tot, trip1, trip2, trip fuel).
Menu 2 (cons.Avg., Cons., Speed avg, air and trip time) if active.
Gear / neutral indication.
Icon referred to the function below from menu 1.
Indication of engine setting for the currently set riding style.
Currently set riding style (riding mode) ...