SPECIFICATIONS - OPERATION - MAINTENANCE
EN - 7
EN
TECHNICAL DATA
ENGINE
Inline twin cylinder, 4 stroke, with four valves per cyl-
inder
Cooling....................liquid and electric fan
Bore.........................3,31in.(84mm)
Stroke........................3,19 in. (81 mm)
Displacement . . . . . . . . . . . . . . . . . 54,8 in3(898 cm3)
Compressionratio ........................13:1
Starting ..............................electric
Type of fuel.............unleaded fuel 95ROZ/RON
TIMING SYSTEM
Type . . . . . . double overhead camshaft chain operated;
4 valves per cylinder
Valve clearance (with engine cold)
Intake.........0,0091 ÷ 0,013 in. (0.23 ÷ 0.33 mm)
Exhaust......0,0118 ÷ 0,0161 in. (0.30 ÷ 0.41 mm)
LUBRICATION
Type . . . . . . . . . . dry sump oil circuit with built-in tank,
cartridge filter and oil/water heat exchanger
IGNITION
Type....................Electronicwith adjustable
advance (digital control)
Spark plug type . . . . . . . . . . . . . . . . “NGK” LMAR8C-9
Spark plug electrode gap
..........0,0315 ÷ 0,0354 in. (0.8 ÷ 0.9 mm)
FUEL SYSTEM
Type . . . . . . . . . . . . . . . . . . . . .Electronic injection feed
PRIMARY DRIVE
Drive gear on crankshaft....................Z 35
Driven gear on clutch housing................Z 68
Transmission ratio . . . . . . . . . . . . . . . . . . . . . . . 1.943
CLUTCH
Type . . .oil bath multiple disc clutch, mechanical control
TRANSMISSION
Type . . . . . . . . . . . . . . . . . . . . constant mesh gear type
Transmission ratio
1stgear........................2.462(32/13)
2nd gear........................1.750 (28/16)
3rd gear ........................1.381 (29/21)
4thgear........................1.174(27/23)
5thgear........................1.042(25/24)
6thgear........................0.960(24/25)
SECONDARY DRIVE
Transmission sprocket (NUDA 900) ............Z 17
Transmission sprocket (NUDA 900 R)...........Z 16
Rearwheelsprocket.......................Z42
Transmission ratio (NUDA 900)...............2.47
Transmission ratio (NUDA 900 R) . . . . . . . . . . . . 2.625
Transmission chain dimensions . . .5/8” x 5/16” (525)
FINAL RATIOS
NUDA 900
1stgear..............................11,815
2nd gear...............................8,398
3rd gear ...............................6,627
4thgear...............................5,634
5thgear...............................5,000
6thgear...............................4,607
NUDA 900 R
1stgear..............................12,557
2nd gear...............................8,925
3rd gear ...............................7,043
4thgear...............................5,987
5thgear...............................5,314
6thgear...............................4,896
CHASSIS
Type . . . . tubular steel trellis with removable steel rear
chassis.
FRONT SUSPENSION
NUDA 900
Type upside-down hydraulic fork
..................ø1,89in.(ø48mm)legs
Wheel travel . . . . . . . . . . . . . . . . . . 8,27 in. (210 mm)
NUDA 900 R
Type upside-down hydraulic fork (adjustable compres-
sion, rebound and spring reload)
...................ø 1,89 in. (ø 48 mm) legs
Wheel travel . . . . . . . . . . . . . . . . . . 8,27 in. (210 mm)
REAR SUSPENSION
NUDA 900
Type . . . . . . . . . . . . . . direct with hydraulic monoshock
(adjustable spring preload and hydraulic rebound damp-
ing)
Wheel travel . . . . . . . . . . . . . . . . . . 7,09 in. (180 mm)
NUDA 900 R
Type . . . . . direct with hydraulic monoshock (adjustable
spring preload and hydraulic compression and rebound
damping; adjustable length)
Wheel travel . . . . . . . . . . . . . . . . . . 7,09 in. (180 mm)