bimota DB7 - Cylinder;Piston; Gearbox

TECHNICAL
SPECIFICATIONS
2
Cylinder/piston
Reference Normal value Limit value
Max. out-of-round wear 0.03 mm
Max. conical shape 0.03 mm
Section A diameter 104.000 mm ÷ 104.010 mm
Section B diameter 104.010 mm ÷ 104.020 mm
Cylinder
Section C diameter 104.020 mm ÷ 104.030 mm
Piston – cylinder coupling
cleareance
0.085 ÷ 0.105
Piston external diameter
measured at 6.0 mm from
the piston base
100 mm 0 ÷ 0.01 mm
Section A diameter 103.905 mm ÷ 103.915 mm
Section B diameter 103.915 mm ÷ 103.925 mm
Piston
Section C diameter 103.925 mm ÷ 103.935 mm
Connecting rod Connecting rod head
diameter
45 mm
Shaftt class Connecting rod class Semi-bearings class
A A Blue+Yellow
B A Yellow+Yellow
A B Blue+Blue
Coupling of connecting
rod semi-bearings
B B Blue+Yellow
Piston – gudgeon pin
clearance
0.010 ÷ 0.018 mm 0.035 mm
Connecting rod –
gudgeon pin clearance
0.035 ÷ 0.048 mm 0.065 mm
Compression of engine
cylinders
13 ÷ 15 bar 11 bar (MIN.),
difference between the two
cylinders: 2 bar (MAX.)
Gearbox
Reference Normal value Limit value
Gearbox shafts Axial clearance 0.05 ÷ 0.25 mm
Gearbox drum Axial clearance 0.10 ÷ 0.40 mm
Fork sliding shoe thickness 3,90 ÷ 4,00 mm
Speed selection fork
Fork – gear clearance 0,070 ÷ 0.285 mm 0,4 mm
Sub 2-5