TECHNICAL DATA - ENGINE
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TECHNICAL DATA - ENGINE
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
248.60 cm³ (15.1706 cu in)
Stroke
54.80 mm (2.1575 in)
Bore
76 mm (2.99 in)
Compression ratio
12.8:1
Idle speed
1,400… 1,500 rpm
Control
DOHC, four valves controlled via cam lever, drive via tooth-wheel
chain
Valve diameter, intake
30.0 mm (1.181 in)
Valve diameter, exhaust
26.0 mm (1.024 in)
Valve clearance
Exhaust at: 20 °C (68 °F)
0.12… 0.17 mm (0.0047… 0.0067 in)
Intake at: 20 °C (68 °F)
0.10… 0.15 mm (0.0039… 0.0059 in)
Crankshaft bearing
2 cylinder bearings
Conrod bearing
Needle bearing
Piston pin bearing
Bronze bush
Pistons
Forged light alloy
Piston rings
1 compression ring, 1 oil scraper ring
Engine lubrication
Pressure circulation lubrication with two rotary pumps
Primary transmission
22:68
Clutch
Multidisc clutch in oil bath/hydraulically activated
Transmission ratio (EXC
‑
F, EXC
‑
F SIX DAYS, XCF-W)
1st gear
13:33
2nd gear
17:33
3rd gear
19:29
4th gear
23:28
5th gear
23:23
6th gear
26:22
Transmission ratio (SX
‑
F, 250 XC-F USA)
1st gear
13:32
2nd gear
15:30
3rd gear
17:28
4th gear
19:26
5th gear
21:25
6th gear
22:24
Generator (EXC
‑
F, EXC
‑
F SIX DAYS, XCF
‑
W, XC
‑
F)
Light coil and charging coil
12 V, 80 W
Generator (SX
‑
F)
Light coil and charging coil
none
Ignition
Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Spark plug
NGK CR 9 EKB
Spark plug electrode gap
0.7 mm (0.028 in)
Cooling
Water cooling, permanent circulation of coolant by water pump
Starting aid (EXC
‑
F, EXC
‑
F SIX DAYS, XCF
‑
W, XC
‑
F)
Electric starter/kickstarter
Starting aid (SX
‑
F)
Kickstarter
Summary of Contents for 2009 250 EXC-F SIX DAYS
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