21 TECHNICAL DATA
106
21.1
Engine
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
692.7 cm³ (42.271 cu in)
Stroke
80 mm (3.15 in)
Bore
105 mm (4.13 in)
Compression ratio
12.7:1
Idle speed
Coolant temperature:
≥
70 °C (
≥
158 °F)
1,650 ± 50 rpm
Control
OHC, intake with cam levers, exhaust controlled by rocker
arm, chain drive
Valve diameter, intake
42 mm (1.65 in)
Valve diameter, exhaust
34 mm (1.34 in)
Valve play, cold
Intake at: 20 °C (68 °F)
0.10 … 0.15 mm (0.0039 … 0.0059 in)
Exhaust at: 20 °C (68 °F)
0.22 … 0.27 mm (0.0087 … 0.0106 in)
Crankshaft bearing
2 roller bearings
Conrod bearing
Slide bearing
Piston pin bearing
Piston pin with
DLC
coating
Pistons
Forged light alloy
Piston rings
1 compression ring, 1 lower compression ring, 1 oil ring
with spring expander
Engine lubrication
Semi-dry sump lubrication system with two trochoid
pumps
Primary transmission
36:79
Clutch
APTC™
antihopping clutch in oil bath/hydraulically oper-
ated
Transmission
6-gear transmission, claw shifted
Transmission ratio
First gear
14:35
Second gear
16:28
Third gear
20:27
Fourth gear
21:23
Fifth gear
23:22
Sixth gear
23:20
Mixture preparation
Electronic fuel injection
Ignition
Contactless controlled fully electronic ignition with digital
ignition adjustment
Alternator
12 V, 300 W
Spark plug
Inside spark plug
NGK LKAR9BI
‑
10
Outside spark plug
NGK LMAR7DI
‑
10
Spark plug electrode gap
1.0 mm (0.039 in)
Cooling
Water cooling, permanent circulation of coolant by water
pump
Starting aid
Starter motor, automatic decompression
Summary of Contents for SM 700 2023
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