They do exist!
From Mike Acre's site...
Model: 240S
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MANUFACTURED BY: HUSQVARNA VAPENFABRIKS AB
HUSKVARNA, SWEDEN
SERIES OR ASSEMBLY NUMBER:
YEAR INTRODUCED: 1975
YEAR DISCONTINUED:
ENGINE DISPLACEMENT: 40cc (2.4 cu. in.)
NUMBER OF CYLINDERS: 1
CYLINDER BORE: 40mm (1.575 in.)
PISTON STROKE: 32mm (1.260 in.)
CYLINDER TYPE: Aluminum with chrome plated bore
INTAKE METHOD: Piston ported
MANUFACTURER ADVERTISED H.P.:
WEIGHT :
OPERATOR CONFIGURATION: One Man operation
HANDLEBAR SYSTEM:
CHAIN BRAKE:
CLUTCH: Centrifugal
DRIVE TYPE: Direct
CONSTRUCTION: Die cast magnesium
MAGNETO TYPE:
CARBURETOR: Walbro HDC series
AIR FILTER SYSTEM: Nylon mesh cartridge
STARTER TYPE: Husqvarna automatic rewind
OIL PUMP: Automatic, adjustable
OPERATING RPM:
IGNITION TIMING: Points should begin to open when mark on flywheel
is 2.5mm (0.1 in.) from upper edge of lower coil
lamination leg. Use test light or continuity meter for
setting.
BREAKER POINT SETTING: 0.3 to 0.4mm (0.012 to 0.016 in.)
FLYWHEEL/COIL AIR GAP:
SPARK PLUG TYPE: Bosch WS7F
SPARK PLUG GAP: 0.5mm (0.020 in.)
CRANKSHAFT MAIN BEARINGS: Ball
FUEL TANK CAPACITY:
FUEL OIL RATIO: 40:1
RECOMMENDED FUEL OCTANE: Regular
MIX OIL SPECIFICATION: Two-stroke chain saw mix oil
CHAIN PITCH: .325 in.
CHAIN TYPE:
SHORTEST GUIDE BAR SUPPLIED: 33cm (13 in.)
LONGEST GUIDE BAR SUPPLIED:
COLOUR SCHEME: Husqvarna Orange enamel