Timing System; Fuel Feeding; Lubrication; Cooling - Husqvarna TE 250 Workshop Manual

GENERAL
ENGINE
4-stroke, single cylinder
Bore (250) ....................................................................................... 2.99 in.
Bore (450- 510) ............................................................................... 3.81 in.
Stroke (250) .................................................................................... 2.17 in.
Stroke (450) .................................................................................... 2.39 in.
Stroke (510) .................................................................................... 2.67 in.
Displacement (250) ................................................................. 15.22 cu. in.
Displacement (450) ................................................................. 27.39 cu. in.
Displacement (510) ................................................................. 30.56 cu. in.
Compression ratio ............................................................................. 12.9:1

TIMING SYSTEM

Double overhead camshaft; 4 valves
Valve angle in relation to cylinder:
INLET .................................................................................................... 12°
EXHAUST ............................................................................................. 13°
Valve clearance with cold engine
INLET.................................................................................. 0.004-0.006 in.
EXHAUST........................................................................... 0.006-0.008 in.

FUEL FEEDING

Type (TE-SMR) ......................................... to injection electronic, throttle body MIKUNI D42
Type (TC-TXC 250) .................................. carburetor "Keihin" FCR-MX 37 with acceleration pump and T.P.S. (Throttle Position Sensor)
Type (TC-TXC 450-510-SMR 450-R)....... carburetor "Keihin" FCR-MX 41 with acceleration pump and T.P.S. (Throttle Position Sensor)
Dry type air filter

LUBRICATION

Type .................................. Dry sump with two oil pump rotors and cartridge filter

COOLING

By fluid with double cooler (TC, TXC, SMR 450-R)
By fluid with double cooler and electric fan (TE-SMR)

IGNITION

CDI electronic (TC, TXC, SMR 450-R) inductive discharge (TE, SMR) with adjustable advance (digital control) (•)
Spark plug type ........................................................................ "NGK" CR8EB (excluded SMR 450-R); "NGK" CR9KB (SMR 450-R)
Spark plug gap ......................................................................... 0.7 mm (excluded SMR 450-R); 0.8 mm (SMR 450-R)
STARTING (TC) ................................. kick start (with automatic decompressor) *
STARTING (TE-TXC) ....... electric and kick start (with automatic decompressor)
STARTING (SMR) ............................... electric (with automatic decompressor) **
*: electric start upon request
**: kick start upon request (excluded SMR 450-R)
(•): Replace data on owner's manual no. 8000 B0147 page 8.
Part. N. 8000 B0148 (02-2008) A.3