Countershaft ball bearing 1 and oil seal 2
Using a suitable puller, extract the ball bearing from the crank-
case half and remove the oil seal.
Press in the new oil seal with the open side facing downwards
until it is flush.
Press in the new ball bearing to its abutting end.
Desmodromic mechanism ball bearing 3
Remove screw A.
At a temperature of approximately 150° C the ball bearing co-
mes out of its seat almost spontaneously.
If necessary, hit the crankcase half against a flat wooden board.
Insert the new bearing and push it to its abutting end. Apply Loc-
tite 243 to the thread of screw A and tighten to 5 N·m.
Gear shaft needle roller bearing 4
Push in the needle roller bearing from the outside.
Insert the new bearing, pushing it in from the outside until it is
flush.
– When the crankcase half has cooled down, ensure that the
bearing is securely seated.
Kickstart release plate 5
When replacing the release plate, apply Loctite 243 to the two
screws and tighten to 8 N·m.
Oil pump casing 6 should bear no signs of scoring or seizure.
Ensure that the passages of all oil channels 7 are clear.
To clean all the oil channels and check that their passa-
ges are clear, it is advisable to remove the two jets and
the by-pass valve (see below).
“60” oil jet 8
Remove the oil jet and blow the oil channel with compressed air.
Degrease the oil jet thread, apply Loctite 243 and refit the oil jet.
NOTE: This jet cools down the piston by spraying engine oil on-
to its lower side.
32
Manuale di Officina RR 4T - 400 - 450 - 525
1 2
3 A
4
5
7
6
8
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