Hercules Mopeds Speed Versions
Sachs 505/1 A,B,D specs
from 1980 Repair Manual
For Hercules mopeds, made from 1975 to 1980, that sold new in the USA, here are the things that determine the speed version: cylinder-and-crankcase, exhaust header pipe, intake pipe, carburetor, air filter cover, and rear sprocket.
Exhaust header 20 OD
20 x 350 exposed outer
20 x 250 inside muffler
Ex. Header 26-24 OD
26 x 400 exposed outer
24 x 200 inside muffler
Exhaust Header 26 OD
26 x 360 exposed outer
26 x 100 inside muffler
How to tell: The cylinder says “25km” or “45km”. The cylinder head fins are either slanted (A,B) or straight (D). The exhaust front pipe is thick or thin. The carburetor says “85/10…” or 85/12…”. The air filter inlet hole is big or small. The rear sprocket is big or small. Find the model row in the table that has the same sizes and ID numbers, to determine what speed version your Hercules moped is.
This information was not easily available. Sources are all factory manuals, parts, service, and owners.
| US-models sheet frame: | Engine Power | Cylinder Version | Intake ID mm | Bing Carburetor | Air filter inlet ID | Ignition timing | Header pipe OD | Sprockets Tires |
| 1977-78 P1 1978-79 Westlake 17mph | 504/1B | 25km | 12.0 | 85/10/101 #50 jet | 13mm | 2.5-3mm (25-28°) | 20mm | 11 x 50T 2.00 - 17 |
| 1975-78 P1 1978-79 Westlake 20mph | 504/1B-A 1.5 hp | 25km | 14.0 | 85/10/101 #50 jet | 13mm | 2.5-3mm (25-28°) | 20mm | 11 x 50T 2.00 - 17 |
| 1977-78 P1 1978-79 Westlake 25mph | 504/1A-B 1.5 hp | 40km | 12.0 | 85/12/101 #52 jet | 16mm | 2.5-3mm (25-28°) | 26-24 | 11 x 38T 2.00 - 17 |
| 1977-78 P1 1978-79 Westlake 30mph | 504/1A-A 1.8 hp | 40km | 14.0 | 85/12/101 #52 jet | 16mm | 2.5-3mm (25-28°) | 26-24 | 11 x 38T 2.00 - 17 |
| 1979-80 Sundancer 20mph | 504/1B 1.0 hp | 25km | 14.0 | 85/10/101 #50 jet | 13mm | 2.5-3mm (25-28°) | 20mm | 11 x 50T 2.25 - 17 |
| 1979-80 Sundancer 25mph | 504/1A 1.5 hp | 40km | 14.0 | 85/12/101A #52 jet | 16mm | 2.5-3mm (25-28°) | 26-24 | 11 x 45T 2.25 - 17 |
| 1979-80 Sundancer 30mph | 504/1D 2.0 hp | 14.5 | 85/12/104A #58 jet | 16mm | 1.5-2mm (19-22°) | 26-26 | 11 x 45T 2.25 - 17 | |
| 1979-80 Seville 20mph oil injection | 504/1B-I 1.0 hp | 25km | 14.0 | 85/10/101 #50 jet | 13mm | 2.5-3mm (25-28°) | 20mm | 11 x 50T 2.25 - 17 |
| 1979-80 Seville 25mph oil injection | 504/1A-I 1.5 hp | 40km | 14.0 | 85/12/101A #52 jet | 16mm | 2.5-3mm (25-28°) | 26-24 | 11 x 45T 2.25 - 17 |
| 1979-80 Seville 30mph oil injection | 504/1D-I 2.0 hp | 14.5 | 85/12/104A #58 jet | 16mm | 1.5-2mm (19-22°) | 26mm | 11 x 45T 2.25 - 17 | |
tube frame: | ||||||||
| 1975-77 M4 1978-79 Balboa 20mph | 505/1B 1.5 hp | 25km | 14.0 | 85/10/101 #50 jet | 13mm | 2.5-3mm (25-28°) | 20mm | 11 x 50T 2.25 - 17 |
| 1977-78 M4 1978-79 Balboa 30mph | 505/1A 1.8 hp | 40km | 14.0 | 85/12/101 #52 jet | 16mm | 1.5-2mm (19-22°) | 26mm | 11 x 40T 2.25 - 17 |
| 1979-80 Suburban 1979-80 Prima 20mph | 505/1B 1.5 hp | 25km | 14.0 | 85/10/101 #50 jet | 13mm | 2.5-3mm (25-28°) | 20mm | 11 x 50T 2.25 - 17 |
| 1979-80 Suburban 1979-80 Prima 25mph | 505/1A 1.8 hp | 40km | 14.0 | 85/12/101A #52 jet | 16mm | 2.5-3mm (25-28°) | 26-24 | 11 x 45T 2.25 - 17 |
| 1979-80 Suburban 1979-80 Prima 30mph | 505/1D 2.0 hp | 14.5 | 85/12/104A #58 jet | 16mm | 1.5-2mm (19-22°) | 26mm | 11 x 45T 2.25 - 17 | |
| 1980-80 Prima G3 20mph | 505/1B | 25km | 14.0 | 85/10/101 #50 jet | 13mm | 2.5-3mm (25-28°) | 20mm | 11 x 46T 2.50 - 17 |
| 1980-80 Prima G3 25mph | 505/1A | 40km | 14.0 | 85/12/101A #52 jet | 16mm | 2.5-3mm (25-28°) | 26-24 | 11 x 46T 2.50 - 17 |
| 1980-80 Prima G3 30mph | 505/1D | 14.5 | 85/12/104A #58 jet | 16mm | 1.5-2mm (19-22°) | 26mm | 11 x 46T 2.50 - 17 | |