The main bearings have are of the angular contact type with offset inner races so that the balls transmit loads from one groove to the other along straight lines at an angle to the axis of the bearing. The angle-contact ball bearings are designed for bearing combined loading (radial-axial loads).
Bearings of this type can bear thrust loads in one direction only. In fact, under the action of a radial load inside the bearing, an axial force is created that must be counterbalanced by an axial force acting in the opposite direction; that is Why these bearings are generally fitted back to back in pairs.
Note
The main bearings supplied can be bearings with bushing (a) or flanged bearings (b) with the bushing integrated in the external ring of the bearing.
To renew the bearings proceed as follows:
Bearings with bushing
Important
On worn engines, the bearing holder may no longer be a tight fit in the crankcase half.
After having removed the bushing, check that the interference fit between the crankcase and the bushing, with bearing fitted, is no less than 0.03 Mm, otherwise, replace the crankcase halves.
Note
Fit the bearings (1) and (18) orienting them so that the side with the "letter" (c) is facing the bushings (2) and (17).
Flanged bearings
Important
On badly worn engines, bearing outer rings may have developed clearance in the crankcase halves - normally, bearing outer rings are interference-fit in the casing.
Check that the interference fit between the crankcase and the bearings (1) and (18) installed, is not less than 0.03 Mm, otherwise, replace the crankcase halves.
Important
After installing new main bearings, shim the crankshaft as described in the paragraph "shimming the shafts" and "reassembly of the crankcase halves" of this section.
Removal of the shock absorber support
Remove the rear brake master cylinder (sect. 7 - 4, Removing of the rear
brake control).
Remove the rear shock absorber (see removal of the rear shock absorber of this
section).
Loosen the screws (2) and (7) and their nuts (35).
Remove the side stand (sect. 7 - 16, Removing of the ...
Specific operating strategies
Idle speed
No electric motor is used for idle speed regulation (bypass is modulated
instead with the throttle valve), as idle speed
control is effected by the ride-by-wire system. Idle speed is maintained by the
control unit when the speed drops below a
specific threshold and when the clutch ...
Dashboard diagnosis
This function identifies any abnormal vehicle behaviours.
The dashboard activates any abnormal vehicle behaviours in real time (errors).
At key-on (at the end of the check) one or more "errors" are displayed in red
(only if they are active).
When an "error" is triggered, the indication (r ...