20 TECHNICAL DATA
112
20.1
Engine
Design
1-cylinder 2-stroke engine, water-cooled, with reed intake
and exhaust control
Displacement
124.8 cm³ (7.616 cu in)
Stroke
54.5 mm (2.146 in)
Bore
54 mm (2.13 in)
Crankshaft bearing
1 grooved ball bearing/1 roller bearing
Conrod bearing
Needle bearing
Piston pin bearing
Needle bearing
Pistons
Cast aluminum
Piston rings
2 half keystone rings
X (upper edge of piston to upper edge of cylinder)
0 … 0.10 mm (0 … 0.0039 in)
Z (height of control flap)
36.5 mm (1.437 in)
Primary transmission
23:73
Clutch
Multidisc clutch in oil bath/hydraulically activated
Gearbox
6-gear transmission, claw shifted
Transmission ratio
first-gear
14:32
second-gear
15:30
third-gear
17:28
fourth-gear
19:27
fifth-gear
19:23
sixth-gear
22:24
Ignition
Contactless controlled fully electronic ignition with digital
ignition adjustment
Spark plug
NGK BR9 ECMVX
Spark plug electrode gap
0.60 mm (0.0236 in)
Starting aid
Kick starter system
20.2
Engine tightening torques
Screw, inner membrane sheets
EJOTDELTA PT
®
35x25
1 Nm (0.7 lbf ft)
Screw, membrane support plate
EJOTDELTA PT
®
30x12
1 Nm (0.7 lbf ft)
Screw, outer membrane sheets
EJOTDELTA PT
®
30x6
1 Nm (0.7 lbf ft)
Screw, clutch spring retainer
M5
6 Nm (4.4 lbf ft)
Screw, control lever, exhaust control
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™
Screw, crankshaft speed sensor
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™
Screw, exhaust control cap
M5
5 Nm (3.7 lbf ft)
Screw, exhaust control cover
M5
4 Nm (3 lbf ft)
Screw, locking lever
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™
Screw, retaining bracket, rotary valve
M5
6 Nm (4.4 lbf ft)
Loctite
®
2701™
Screw, stator
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™
