BMW AG Motorcycle (F 650 GS). Manual - part 23

23.2

23.3

23

Technical Data

F 650

Transmission

Type

Integral 
5-speed gearbox with claw shift

Gear steps

Primary: 37/72=1:1.946

Gearbox ratios:

1st gear

2nd gear

3rd gear

4th gear

5th gear

12/33 = 1:2.750

16/28 = 1:1.750

16/21 = 1:1.313

22/23 = 1:1.045

24/21 = 1:0.875

Engine ratio:

1st gear

2nd gear

3rd gear

4th gear

5th gear

1:5.352

1:3.406

1:2.555

1:2.034

1:1.703

Wear limit values for selector fork:

Selector fork guide journal diameter

mm (in) min. 5.85 (0.230)

Thickness at contact faces

mm (in) min. 3.45 (0.136)

Wear limit values for mainshaft:

Shaft diameter, magneto side

mm (in) min. 24.98 (0.983)

Shaft diameter, clutch side

mm (in) min. 16.98 (0.669)

Wear limit values for countershaft:

Shaft diameter, magneto side

mm (in) min. 16.98 (0.669)

Shaft diameter, clutch side

mm (in) min. 24.97 (0.983)

23.4

23.5

Gearbox shafts, components

E230050

23.6

Gear shift pedal, components

F239030

23.7

23 00 100 

Removing/installing gearbox

e

 Caution:

If there is any mechanical damage, the oil tank must 
be cleaned.

–

Remove the engine.

a

....................................................See Group 11

–

Disassemble the engine.

a

....................................................See Group 11

23 00 640 

Removing selector shaft with 

pawl and index lever

•

Pry the sealing ring of the selector shaft out of the 
cover.

•

Press shift pawl (3) slightly outward and withdraw 
selector shaft with shift pawl (1, 3).

•

Remove index lever (2) and spring.

23 00 158 

Removing selector forks

•

Pull out guide pins (6) of selector forks.

•

Swing the selector forks (5) out and remove 
them.

•

Inspect contact surfaces of selector forks and 
guide pins for signs of wear.

23 00 651 

Removing selector drum

•

Withdraw selector drum (4).

•

Inspect selector drum guide tracks (7) and insu-
lating washer (8) with neutral indicating contact 
(arrow) for signs of wear.

E230010

2

3

4

5

1

6

E230020

7

8

23.8

23 00 600 

Removing, disassembling 

and reassembling gearbox shafts

Removing gearbox shafts

•

Pull sliding gears (13, 16) with bearing (15) and 
washer (14) off the mainshaft.

•

Strike mainshaft (1) and countershaft (17) lightly 
with a plastic-faced hammer and remove them.

23 00 636 

Disassembling and 

reassembling mainshaft

•

Clamp the mainshaft in a vise fitted with protec-
tive jaws.

e

 Caution:

Do not alter the stop on the special pliers, 
BMW No. 23 4 500, in order to avoid opening up the 
circlip too much.

•

Using special pliers, BMW No. 23 4 500, push 
back retaining ring (7) slightly so that retaining 
ring (12), which is retained by angled ring (11), 
can be removed.

•

Pull off gearwheel (10) with needle roller 
bearing (9) and washer (8).

•

Remove retaining ring (7).

•

Remove gearwheel (6).

•

Remove circlip (5) with washer (4).

•

Pull off gearwheel (3).

•

Pull off needle bearing (2).

L

 Note:

Check all bearings, bearing journals, tooth edges, 
keyways and annular grooves for wear.
Always replace gearwheels complete with their 
matching gearwheels as pairs.
Edges of ring grooves must not be blunt.
Always renew circlips and install them only with spe-
cial pliers, BMW No. 23 4 500.

•

Installation is the reverse of the removal proce-
dure: pay particular attention to the following.

•

Position retaining ring (7) approx. 3 mm (0.12 in) 
below the groove. After installing retaining 
ring (12), push retaining ring (7) up with 
gearwheel (6) until the retaining ring is seated in 
its groove.

1

7

13

17

16

12

11

10

6

5

3

2

4

8

14

15

9

E230030

23.9

Checking mainshaft for wear

Wear limits:
“A” Shaft diameter, magneto 
side ......................................... 24.98 mm (0.983 in)
“B” Shaft diameter, clutch 
side ......................................... 16.98 mm (0.669 in)
Runout .................................. 0.02 mm (0.0008 in)

A

B

F230050