BMW AG Motorcycle (F 650 GS). Manual - part 9
11.8
Piston rings
1st groove
Rectangular-section ring
Ring thickness
Ring thickness wear limit
End gap
End-gap wear limit
Groove-height wear limit
Ring float
Ring float, wear limit
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
1.2 (0.05)
1.15 (0.045)
0.2...0.4 (0.008...0.016)
1.0 (0.04)
1.30 (0.051)
0.03...0.065 (0.0012...0.0026)
0.15 (0.045)
2nd groove Micro-taper ring
Ring thickness
Ring thickness wear limit
End gap
End-gap wear limit
Groove-height wear limit
Ring float
Ring float, wear limit
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
1.5 (0.06)
1.45 (0.057)
0.2...0.4 (0.008...0.016)
1.0 (0.04)
1.6 (0.06)
0.03...0.065 (0.0012...0.0026)
0.15 (0.045)
3rd groove Spring-steel oil control ring
End gap
End-gap wear limit
Groove-height wear limit
Ring float
Ring float, wear limit
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
0.2...0.4 (0.008...0.016)
1.0 (0.04)
2.6 (0.10)
0.03...0.065 (0.0012...0.0026)
0.15 (0.045)
Piston pin
Piston pin dia.
Wear limit
mm (in) 21.98 (0.865)
Piston-pin play
in small end bore
Wear limit
in bore in piston
Wear limit
mm (in)
mm (in)
mm (in)
mm (in)
0.015...0.029 (0.0006...0.0011)
0.050 (0.0020)
0.012...0.021 (0.0005...0.0008)
0.050 (0.0020)
Cylinder
Bore
Cylinder “A”
Wear limit
mm (in)
mm (in)
100.000...100.012 (3.9371...3.9376)
100.03 (3.9382)
Bore
Cylinder “B”
Wear limit
mm (in)
mm (in)
100.012...100.024 (3.9376...3.9380)
100.04 (3.9387)
Timing chain
Wear limit
Distance from sealing face of plug to pis-
ton of chain tensioner
mm (in) 9.0 (0.35)
Clutch and gearbox
Clutch friction plates (8 plates)
Size per plate on installation
Wear limit for thickness of plate assembly
(total)
mm (in)
mm (in)
3.45...3.55 (0.136...0.140)
27.5 (1.082)
Copper springs
Wear limit at 190 N
mm (in) 27.4 (1.079)
Oil pump
Oil pumps
primary/secondary
Technical Data
F 650 GS