25
TECHNICAL DATA
220
25.1
Engine
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
349.7 cm³ (21.34 cu in)
Stroke
57.5 mm (2.264 in)
Bore
88 mm (3.46 in)
Compression ratio
12.3:1
Idle speed
1,950… 2,050 rpm
Control
DOHC, four valves controlled via cam lever, drive via timing
chain
Valve diameter, intake
36.3 mm (1.429 in)
Valve diameter, exhaust
29.1 mm (1.146 in)
Valve clearance
Intake at: 20 °C (68 °F)
0.10… 0.15 mm (0.0039… 0.0059 in)
Exhaust at: 20 °C (68 °F)
0.13… 0.18 mm (0.0051… 0.0071 in)
Crankshaft bearing
2 cylinder bearings
Conrod bearing
Slide bearing
Piston pin bearing
Not a bearing bush - DLC-plated piston pins
Pistons
Forged light alloy
Piston rings
1 compression ring, 1 oil scraper ring
Engine lubrication
Pressure circulation lubrication with two Eaton pumps
Primary transmission
24:73
Clutch
Multidisc clutch in oil bath/hydraulically activated
Transmission ratio
1st gear
14:32
2nd gear
16:26
3rd gear
20:25
4th gear
22:23
5th gear
25:22
6th gear
26:20
Alternator
12 V, 168 W
Ignition
Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Spark plug
NGK LMAR9AI-8
Spark plug electrode gap
0.8 mm (0.031 in)
Cooling
Water cooling, permanent circulation of coolant by water pump
Starting aid
Kick starter and electric starter
25.2
Engine tolerance, wear limits
Valve - run-out
At the valve plate
≤
0.05 mm (
≤
0.002 in)
Valve spring
Minimum length
42.00 mm (1.6535 in)
Valve - sealing seat width
Intake
1.40 mm (0.0551 in)
Exhaust
1.40 mm (0.0551 in)
Valve spring seat - thickness
0.90… 1.10 mm (0.0354… 0.0433 in)
Camshaft bearing - sleeve bearing
Radial clearance
0.020… 0.054 mm (0.00079… 0.00213 in)
Wear limit
0.065 mm (0.00256 in)
Cylinder/cylinder head - distortion of sealing area
≤
0.10 mm (
≤
0.0039 in)
Piston - diameter
Size I
87.965… 87.975 mm (3.46318… 3.46358 in)
Summary of Contents for 350 EXC-F SIX DAYS EU
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