Husqvarna SM 50 / 2011, Workshop Manual

Page: 92 / 150

F.26
Ed. 01-09-2010
ENGINE
ENGINE - TECHNICAL DATA
Engine type ..................................2-stroke Otto single-cylinder
with reed infeed
Bore x stroke ......................................................39.5 x 40 mm
Displacement .................................................................49 cm
3
Carburettor .................................................Dell’Orto PHBG 19
Lubrication ...................................................mixture lubrication
Fuel supply ....................... NO 95 unleaded premium gasoline
and 2-stroke high-quality oil mixture
Mixture ratio .............................................3% during running-in
2% after running-in
Primary drive ......................................Spur gear,16: 57 Z ratio
Cooling liquid ......................cooling with 0.5 litres, consisting of
50% antifreeze, 50% distilled water, at least -25°
Air filter ............................................................ wet with sponge
Spark plug .................... NGK BR 8 ECM electrode gap 0.6 mm
Gearbox oil ...................150 cc of oil for automatic transmission
Main bearings ......................................................2 ball bearings
Connecting rod big end bearing ............... needle roller bearing
Connecting rod small end bushing ............ needle roller bearing
Piston rings .........................................................1 R piston ring
MODEL CR 50
Carburettor type Dell’Orto PHBG 19
Main jet 85
Main nozzle 260 AU
Idle jet 48
Taper needle W9
Needle position 3.
Open mixture adjuster screw 3.0
Throttle valve 60
Start jet 60
ORIGINAL CARBURETTOR SETTING
TOLERANCE AND ASSEMBLING CLEARANCES
DESCRIPTION SUBJECT VALUES
Crankshaft shaft axes offset - max 0.050 mm
Handwheels outer measurement - 38 mm ± 0.05 mm
Connecting rod big end bearing Radial clearance max 0.030 mm
Piston Assembly clearance 0.045 - 0.055 mm
Piston ring Gap max 0.20 mm
Clutch shoes Outer diameter 82.5 mm (new)
Clutch drum Diameter max 84.4mm (84.00-84.01)
Spring min. length - 19.6 mm