VESPA LX 4T USA Workshop Manual page 9

LX 4T USA
Engine
Specification
Stroke
Cubic capacity
Compression ratio
Timing system
Vacuum-type carburettor
CO adjustment
Engine idle speed
Air filter
Starting system
Lubrication
Fuel supply
Max. power (crankshaft)
Cooling system
Valve clearance (cold engine)
ENGINE
Type
Bore
Desc./Quantity
Single-cylinder, 4-stroke, Piaggio Hi-Per 4
39 mm
41,8 mm
49.93 cm³
11,5 ÷ 12 : 1
single overhead camshaft, driven by a chain to the left side.
KEIHIN CVK Ø 18 mm
3.2% ± 0.5
1900 ÷ 2000 rpm
Sponge impregnated with fuel mixture (50% SELENIA air filter
oil and 50% unleaded petrol).
electric starter/kickstarter
engine lubrication with lobe pump (in the crankcase) driven by
a chain. Mesh prefilter and centrifugal on the crankshaft
Gravity feed, with unleaded petrol (with a minimum octane rat-
ing of 95) with carburettor.
2,5 KW (3,4 CV) at 6500 rpm.
forced coolant circulation system
intake 0.10 mm
discharge 0.15 mm
Characteristics
CHAR - 9