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http://www.ultralightnews.com/hirth-engines.htm Page 16 of 30
Home of the L'il Hustler SS
4.Specifications ? 2703 engine
Table 3.5-1
Manufacturer Göbler-Hirthmotoren KG
Model 2703
Operating mode Two stroke
Number of cylinders Two in line
Piston Capacity 521 cm
3
Stroke Length 64 mm
Bore 72mm
Compression ratio 9.5:1
Performance 38.2 kW (52 HP) single carburettor /40.4kw (55 HP) two
carburettor.
RPM, max. 6500 rpm
Direction of revs Left, looking towards the drive shaft
Starter Electric Starter and/or Recoil Starter
Ignition System Electronic Characteristic Ignition, single or dual
Generator 250 W, 12 V
Sparkplugs BR 8 ES (NGK) WR 4 CC (Bosch), W 24 ERS (ND)
Ignition Timing 16v. OT (at 2000 rpm)
0
Carburation 1 BING 54/38/122; 2 BING 54/38/131, 1/2 Air filters
Cooling Fan Cooling, directly driven via flat belts
Mixing 1:50
Fuel Premium unleaded, 95 Octane
Two Stroke oil Branded two stroke oil for hot (air-cooled) engines
Cylinder head temperature Max 280C/536F
00
Exhaust gas temperature max 680C/1256F
00
Fuel pressure min. 0.3 bar / 5.8 psi
Engine weight without exhaust System 31kg / 70.88lbs
Weight of exhaust system 6 kg / 7.33 lbs
4.1.Installation Drawing - 2703
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