Derbi GPR 125 Racing, Workshop Manual

Page: 87 / 247

4 - ENGINE
87
CLASS 1
CLASS 2
RED
BLUE
MIN (mm)
2.005
2.010
HALF-BEARING THICKNESS
Ref. Lower (without orifice)
864591
864590
MAX (mm)
2.010
2.015
Ref. Upper (with orifice)
864589
864588
CRANKSHAFT
CRANKCASE
Example:
Based on an engine comprising a Class A crankcase (diameter between 36.500 and 36.508 mm), and a Class
2 crankshaft (diameter between 32.485 and 32.490 mm), two RED type bearings should be fitted, Ref. 864591
and 864589.
If the crankcases have mixed bearings, they can be fitted regardless of their initial location.
CLASS 2
BLUE+BLUE
RED+BLUE
CLASS 1
RED+BLUE
RED+RED
CLASS 1
CLASS 2
MIN (mm)
32.480
32.485
CRANKSHAFT DIAMETER
REFERENCE
8711475001
8711475002
MAX (mm)
32.485
32.490
CLASS 1
CLASS 2
MIN
(mm)
36.508
36.516 36.500
36.508
MAX
(mm)
CRANKCASE MACHINED DIAMETER (D1)
HALF-BEARING
D1
N.B.: Clearance betwen crankshaft support and semi=bearing: 0,020 - 0,050 mm