Technical Data; Engine; Engine Tolerance, Wear Limits - Husqvarna FC 250 2015 Repair Manual

24

TECHNICAL DATA

24.1

Engine

Design
Displacement
Stroke
Bore
Compression ratio
Idle speed
Control
Valve diameter, intake
Valve diameter, exhaust
Valve clearance
Intake at: 20 °C (68 °F)
Exhaust at: 20 °C (68 °F)
Crankshaft bearing
Conrod bearing
Piston pin bearing
Pistons
Piston rings
Engine lubrication
Primary transmission
Clutch
Gearbox
Transmission ratio
1st gear
2nd gear
3rd gear
4th gear
5th gear
Alternator
Ignition
Spark plug
Spark plug electrode gap
Cooling
Starting aid
24.2

Engine tolerance, wear limits

Camshaft bearing - sleeve bearing
Radial clearance
Wear limit
Valve spring
Minimum length of intake valve
Minimum length of exhaust valve
Valve - sealing seat width
Intake
Exhaust
Valve - run-out
At the valve plate
Valve spring seat - thickness
Cylinder/cylinder head - distortion of sealing area
1-cylinder 4-stroke engine, water-cooled
249.91 cm (15.2505 cu in)
3
52.3 mm (2.059 in)
78 mm (3.07 in)
13.9:1
2,250 ... 2,350 rpm
DOHC, four valves controlled via cam lever, drive via timing
chain
32.5 mm (1.28 in)
26.5 mm (1.043 in)
0.10 ... 0.15 mm (0.0039 ... 0.0059 in)
0.13 ... 0.18 mm (0.0051 ... 0.0071 in)
2 cylinder bearings
Slide bearing
Bearing bush
Forged light alloy
1 compression ring, 1 oil scraper ring
Pressure circulation lubrication with two Eaton pumps
24:73
Multidisc clutch in oil bath/hydraulically activated
5-gear, claw shifted
13:32
16:32
17:28
19:26
21 :25
12V, 66W
Contactless controlled fully electronic ignition with digital igni-
tion adjustment
NGK LMAR9Al-8
0.8 mm (0.031 in)
Water cooling, permanent circulation of coolant by water pump
Electric starter
0.020 ... 0.054 mm (0.00079 ... 0.00213 in)
0.065 mm (0.00256 in)
41.20 mm (1 .622 in)
41.10 mm(1.6181 in)
1 .40 mm (0.0551 in)
1 .40 mm (0.0551 in)
s: 0.05 mm (S: 0.002 in)
1.40 ... 1.50 mm (0.0551 ... 0.0591 in)
s: 0.10 mm (S: 0.0039 in)
198