TECHNICAL DATA
ENGINE
Type..............................................single cylinder, 2 stroke
Cooling........................................................................liquid
Bore............................................................2.13 in. (54 mm)
Stroke......................................................2.15 in. (54,5 mm)
Displacement................................... 7.62 in3. (124,82 cm3)
Compression ratio
(with closed ports) ..........................................................8,8:1
Starting ................................................................kick start
TIMING SYSTEM
Type..........lamellar valve on suction in the crankcase and
H.T.S. valve with mechanical control on the exhaust
LUBRICATION
Engine .................... 4% (1:25) of oil-gasoline mix
during running in; NOT LESS than 3% (1:33)when running in is
over
Primary drive transmission/Gearbox . .by the oil contained in
the crankcase
IGNITION
Type...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . electronic digital
capacitor-discharge type, with variable advance
Spark plug type . . . . . . . . . . . CHAMPION QN B4/NGK BR9EG
Gap ............................0.0236in.(0,6mm)
FUEL SYSTEM
Type..........................................Carburettor “Mikuni” TMX 38
Venturi diameter............................................1.5 in. (38 mm)
High speed jet (CR)...........................................................460
High speed jet (WR)..........................................................380
Low speed jet (CR) ..............................................................35
Low speed jet (WR) .............................................................15
Starting jet (CR)..................................................................80
Starting jet (WR).................................................................50
Main nozzle.............................................................R-8 (914)
Floater (n° 2).................................................................g 6,1
Throttle piston (CR)............................................................4,0
Throttle piston (WR)...........................................................5,0
Metering pin...............................................................6BFY43
Metering pin slot (CR)....................................................... 3rd
Metering pin slot (WR)......................................................2nd
Idle mixture adjusting screw (CR)......................rounds 1+1/4
Idle mixture adjusting screw(WR)......................rounds 1+1/2
PRIMARY DRIVE
Drive pinion gear- Clutch ring gear .........................Z 22- Z 71
Transmission ratio .........................................................3,227
CLUTCH
Type......oil bath multiple disc clutch, mechanical control
TRANSMISSION
Type........................................ constant mesh gear type
Transmission ratio
1stgear............................2,357(z33/14)
2nd gear............................1,866 (z 28/15)
3rd gear ............................1,579 (Z 30/19)
4thgear............................1,350(Z24/22)
5thgear............................1,181(Z26/22)
6thgear............................1,000(Z21/21)
SECONDARY DRIVE
Transmission sprocket- Rear wheel sprocket ............Z 13- Z 50
Transmission ratio..........................................................3,846
FINAL RATIOS
1st gear ......................................................................29,258
2nd gear......................................................................23,170
3rd gear .....................................................................19,599
4th gear.......................................................................16,757
5th gear ......................................................................14,669
6th gear ......................................................................12,412
FRAME
Type...............................Steel single tube cradle (roud tubes);
light alloy rear frame.
FRONT SUSPENSION
Type...................”Upside-down” telescopic hydraulic front fork
with advanced axle (adjustable in compression and rebound
stroke); stanchions tubes Ø 1.89 in. (Ø 48 mm)
Legs axis stroke.......................................11.8 in. (300 mm)
REAR SUSPENSION
Type..............progressive with hydraulic single shock absorber
Wheel stroke............................................11.6 in. (296 mm)
FRONT BRAKE
Typefixed disc Ø 10.24 in. (Ø 260) “Wave” type with hydraulic
control and floating caliper
REAR BRAKE
Type................... floating disc, Ø 9.45 in. (Ø240) “Wave” type
with hydraulic control and floating caliper