BMW R 1150 R Repair Manual page 78

Technical Data
Pistons
Piston dia.
A
Wear limit
B
Wear limit
AB
Wear limit
Installed clearance
Total wear clearance of piston and
cylinder
Piston pin bore
Weight classes
Weight difference in one class
Direction of installation
Piston rings
1st groove
Asymmetric piston ring,
curved, oval section
Height
Wear limit
Ring gap
Wear limit
Ring float
Wear limit
2nd groove
Micro-taper compression ring
Height
Wear limit
Ring gap
Wear limit
Ring float
Wear limit
R 1150 R
(Measuring plane A — see Checking pistons and
cylinders)
mm (in) 100.971... 100.983 (3.9753...3.9758)
mm (in) 100.895 (3.9723)
mm (in) 100.983... 100.995 (3.9757...3.9763)
mm (in) 100.905 (3.9727)
mm (in) 100.979... 100.987 (3.9756...3.9759)
mm (in) 100.900 (3.9725)
mm (in) 0.005... 0.029 (0.0002...0.0011)
mm (in) 0.12 (0.0047)
mm (in) 22.005... 22.011 (0.8663...0.8666)
+ and —
grammes 10 (0.353) (complete with pins and rings)
(oz.)
Arrow on piston crown pointing to exhaust side
Production locating point towards exhaust side
(see Installing piston)
mm (in) 1.170... 1.190 (0.0461...0.0469)
mm (in) 1.1 (0.0433)
mm (in) 0.1... 0.3 (0.0039...0.0118)
mm (in) 0.8 (0.0315)
mm (in) 0.030... 0.070 (0.0012...0.0027)
mm (in) 0.15 (0.0059)
mm (in) 1.170... 1.190 (0.0461...0.0469)
mm (in) 1.1 (0.0433)
mm (in) 0.2... 0.4 (0.0078...0.0158)
mm (in) 0.8 (0.0315)
mm (in) 0.030... 0.07 (0.0012...0.0027)
mm (in) 0.15 (0.0059)
11.11