BMW K75 Repair Manual page 58

Engine
Specifications
Model
K75
IK75C
I K75S IK 100
I K 100 RSI K 100 RTIK 100 LT
Valve seatwidth
inlet
mm 1.15 ± 0.25
exhaust
mm 1.35 ± 0.25
Wearlimit
inlet
mm 2.50
exhaust mm 3.00
Valve guide totallength
inlet
mm 45
exhaust
mm 45
External diameter
mm
13 +0.044
u6- 0.036
Internal diameter
mm
7H7+ 0.015
- 0
Wearlimit
mm 7.100
Bore in cylinder head mm
13 H7 +0.018
- 0
Repair oversize mm
13.2 H 7
~ ~.018
Valve stem clearance
inlet
mm 0.025 ... 0.050
exhaust
mm 0.040 ... 0.070
Wearlimit
inlet mm 0.150
exhaust mm 0.165
Valvegear
Valve actuation Direct, by bucket-type tappets
Camshaft drive Pre-stretched, endless single roller chain
Number of links 126
Valve springs
Wire tickness mm 4.25
External winding dia.
mm
29.25±0.2
Spring length, relaxed mm 44.5
Wearlimit
mm 43.0
Pitch direction
clockwise
No. of active windings
4.5 ... 3.8
Total number of windings
6.3
11 - 06.0
8.87