Bore: 94 mm/3.70 in.
Stroke: 68 mm/2.67 in.
Capacity: 944 cm³/57.58 cu. in.
Compression ratio: 10.2±0.5:1
Max. power at crankshaft (95/1 /EC): 61 kW (83 CV) at: 8,500 rpm
Max. engine speed: 9,000 rpm
Timing system
Desmodromic valve timing gear. Two valves per cylinder controlled by four rocker arms (two closing and two opening). Overhead camshaft with four lobes.
Timing gear, crankshaft-driven over cylindrical gears, pulleys and toothed belts.
Desmodromic valve timing
1) Opening (or upper) rocker arm. 2) Opening (or upper) rocker arm adjuster. 3) Split rings. 4) Closing (or lower) rocker arm adjuster. 5) Lower rocker return spring. 6) Closing (or lower) rocker arm. 7) Camshaft. 8) Valve.
Valves
Inlet valve diameter: 43 mm/1.69 in.
Exhaust valve diameter: 38 mm/1.49 in.
Timing
Data measured with 1 mm clearance and timing belts tensioned with service tool no. 051.2.001.1A at 11.5
Inlet valve opens at: 29° before TDC
Inlet valve closes at: 73° after BDC.
Exhaust valve opens at: 71° before BDC.
Exhaust valve closes at: 30° after TDC.
Valve lift
Data measured with 0 mm clearance.
- Inlet: 11.8 mm/0.46 in.
- Exhaust: 11.4 mm/0.44 in.
Tappet clearances (with the engine cold)
Opening rocker arm:
- Inlet: 0.05+0.12 mm/0.0019-0.0047 in.
- Exhaust: 0.05+0,15 mm/0.0019-0.0059 in.
A clearance (A) of up to 0.05 mm/0.0019 in. is permitted: above this clearances must be reset.
Closing rocker arm:
- Inlet and exhaust: 0.03+ 0.20 mm/O.0012-0.0078 in.
A clearance (B) of up to 0.20 mm/0.0078 in. is permitted: above this clearances must be reset.