bimota DB7 - Timing System;Valves; Tension Belts Adjustment at Cold; Engine Shaft

TECHNICAL
SPECIFICATIONS
2
Timing system/valves
Reference Assembly value Check value
With valves clearance 1 mm
Opening 15° BTDC
Intake
Closing 58° ABDC
Opening 60° BBDC
Exhaust
Closing 20° ATDC
Intake valve diameter 42 mm
Timing system
diagram
Exhaust valve diameter 34 mm
Intake 11.8 mm
With valves clearance 0 mm
Exhaust 10.6 mm
Rocker arm opening-intake 0,13 ÷ 0,18 mm 0,10 ÷ 0,25 mm
Rocker arm opening-exhaust 0,13 ÷ 0,18 mm 0,10 ÷ 0,25 mm
Rocker arm closing-intake 0,05 ÷ 0,10 mm 0,05 ÷ 0,25 mm
Valves lift
Rocker arm closing-exhaust 0,05 ÷ 0,10 mm 0,05 ÷ 0,25 mm
Tension belt adjustment at cold
Reference Assembly value (new belt) Restore value (used belt)
DDS 110 ± 5 Hz (horizontal)
110 ± 5 Hz (vertical)
80 ± 5 Hz (horizontal)
80 ± 5 Hz (vertical)
Edge min value at cold 70 Hz 70 Hz
Engine shaft
Reference Normal value Limit value
Out-of-round wear 0,005 mm
Conical shape 0,005 mm
Crankshaft pivots alignment 0,01 mm on diameter
Sub 2-4