BMW R 1150 RT Repair Manual

11.33
11 25 Checking pistons and cylinders
Reference temperature for measurements:
...........................................................20 C (68 °F)
Measure cylinder bore with internal probe at
20 mm (0.7874 in) and 100 mm (3.9370 in) from the
top in direction of piston pin, and again at a right an-
gle to the first measurement (
a 11.10).
Measuring plane A:..................... 6 mm (0.2362 in)
Piston sizes (
a 11.11).
•
Install piston rings in cylinder.
•
Measure end gap using feeler gauge (a 11.11).
11 25
Assembling pistons
L Note:
Make sure that the gap of the coiled spring is offset
approximately 180° from the gap of the oil control
ring.
Install with “TOP” uppermost.
•
Carefully fit piston rings to piston in the following
sequence, using piston ring pliers:
3rd groove - coiled-spring ring
2nd groove - micro-chamfer ring
1st groove - asymmetric piston ring, oval section
(
a 11.11).
RS110180
100
20
RS110970
A
RS110200
R21110050
1.
2.
3.

BMW R 1150 RT Specifications

General

Displacement	1130 cc
Transmission	5-speed
Final Drive	Shaft
Bore x Stroke	101 mm x 70.5 mm
Compression Ratio	10.3:1
ABS	Optional
Engine Type	Air/oil-cooled, four-stroke, Boxer twin
Power	95 hp at 7, 250 rpm
Torque	100 Nm at 5, 500 rpm
Dry Weight	259 kg
Front Suspension	Telelever
Rear Suspension	Paralever
Front Brakes	Dual disc
Rear Brakes	Single disc
Wheelbase	1485 mm (58.5 in)