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Workshop manual RR 4T - 250 - 400 - 450 - 525
Removing the gearshift mechanism and the gear shafts
– Lay down the engine on one side.
– Release the engine fastening on the stand.
– Detach the left-hand crankcase half using suitable tools posi-
tioned on the specially designed supports. Alternatively, gen-
tly tap the driven shaft with a plastic mallet.
TO PREVENT DAMAGE TO THE SEALING SURFACES,
AVOID SEPARATING THE CRANKCASE WITH A
SCREWDRIVER OR A SIMILAR TOOL.
– Remove the left-hand crankcase half with its gasket.
– Remove the two centring bushes from the crankcase and fix
the right-hand crankcase half in the stand.
– Remove thrust washer 1, O-ring 2 and inner ring nut 3.
– Remove the two fork guide rods 4 with the four springs from
the crankcase and turn the gearshift forks to one side.
– Remove desmodromic mechanism 5.
– Remove gearshift forks 6.
During the removal, ensure that gearshift bushes A on
the fork dragging pins are not left in the desmodromic
mechanism.
– Jointly remove the driving shaft and the driven shaft from their
seats.
– Remove 1st speed idler gear 7 from the crankcase together
with the needle roller cage and the two thrust washers.
3
1
4
4
2
6
5
6
7
A
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