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.
Overhaul of the flywheel-alternator assembly
Examine the inner part of alternator rotor (24) for signs of damage. Check
that the starter clutch is working properly and
that the needle races do not show signs of wear or damage of any kind. If there
is any malfunction, remove the whole
assembly.
Disassembling the generator flywheel
U ...
Recovery procedure with no key
When the dashboard is on and the key has been recognised, the hands free
attempts to detect the key every 60 seconds.
If the engine is off and the on/off switch on the handlebar is turned to "run
off", if no key is detected within 10 seconds,
the dashboard switches off automatically.
If t ...
Residual range indication when the service is due
After resetting the first oil service warning (triggered at 1000 km), upon
every key-on the system displays the
indication of which type of service should be performed next (oil service or
desmo service) and the residual range.
A (green) warning (1) is activated for 2 seconds on every key-on ...