Technical Specification; The Motor - SHERCO 250 SEF-R Workshop Manual

TECHNICAL SPECIFICATION

THE MOTOR

Type
Displacement
Bore/Stroke
Compression ratio
Fuel
Valve timing
Admission valve diameter
Exhaust admission valve
Thickness admission valve
Thickness exhaust valve
Crankshat bearing
Piston
Lubrification
Motor oil
Primary reduction ratio
Gear box :
st
1
nd
2
rd
3
th
4
th
5
th
6
Final transmission
Clutch
Ignition system / Batterie
Electronic injection
250 SEF-R
Liquid cooled single cylinder 4 strokes engine
248.6 CC
76/54.8mm
13.2 :1
Without lead 95 or 98
4 valves, DOHC driven by tooth type chain
29mm
0.15-0.2mm
0.2-0.25mm
2 roller bearing
Aluminium forge
Lubrication under pressure with 2 trochoidal pumps
1 litre SAE 10W40
13 X 49
Multi-disk in oil bath. Hydraulic command
Electric start/12V 4Ah
300 SEF-R
303.7 CC
84/54.8mm
12.85:1
30mm
25mm
21 :70
6 speed
14 : 33
17 : 30
19 : 28
21 : 26
23 : 24
25 : 22
13 X 48
Synerject
5