The ultimate foundation for anyone who wants to give their moped with a Sachs 503 manual transmission engine a new lease on life and ensure it runs smoothly: With the Signature Engine Overhaul, you’re getting an exclusive service from one of the most renowned moped shops in the scene. This isn’t a mass-produced item—it’s precision craftsmanship with character, expertise, and genuine cult appeal.
This offer is for anyone who wants to breathe new life into their moped with a Sachs 503 engine or is looking for a reliable foundation for a custom project. The engine block is intentionally overhauled without the ignition system—ideal for anyone who wants to customize their own setup.
For those who need an original ignition system, we also offer it in our shop.
At Siggnature, every engine block is completely disassembled, thoroughly cleaned, and professionally overhauled. All wear parts—such as bearings, oil seals, and even the crankshaft—are systematically replaced with new parts. All components are precisely measured, neatly assembled, and put back together as befits a professional engine rebuild. The result is a technically optimized engine that runs smoothly, performs reliably, and is ready for many trouble-free kilometers.
Even with the robust Sachs 503 engine, wear and tolerance issues often only become apparent upon disassembly. With this engine overhaul, you’ll create a solid, long-lasting foundation—whether for a faithful restoration or a setup with a little more punch.
Service Process: You can follow the exact process in Sigg’s video. In addition, your package includes a detailed step-by-step guide straight from the workshop to take home with you.
Note: The engine must, of course, be complete and show no damage to the casing. If defects are found during the initial inspection that aren’t included in the rebuild, we’ll contact you so we can work together to find a simple solution.
An awesome custom product straight from the Siggnature workshop.
Dimension needle bearing: 12 / 15 x 14.2 mm (axe 12) · Manufacturer: swiing® ingenious parts · Cheek type: standard · Crankshaft stroke: 42 mm · Connecting rod length center-center: 85 mm · Total length of crankpin on clutch side: 43.1 mm · Total length crankpin ignition side: 63.4 mm · Ø crank webs: 85 mm · Ø piston pin (B): 12 mm · Ø Connecting rod eye: 15 mm · Ø Bearing seat (clutch side): 15 mm · Ø Bearing seat (ignition side): 15 mm · Thread type: MF10x1 (fine pitch thread) · Thread length: 8 mm, 12 mm · Wide crank webs: 30 mm · Length 1st paragraph: 21 mm · Length 2nd paragraph: 14 mm · Ø 1st step (on the coupling side): 15 mm · Ø 2nd shoulder (on the clutch side): 12 mm · Length of shoulder (ignition side): 34 mm · Weight: 901 g · Number of gears: 2 pcs · Area of application: High End
Place of use: none, enlarging, downsizing, Oberflächenbehandlung · Manufacturer: mofakult Acadamy
![[DL] Siggnature small parts, consumables & cleaning](https://www.mofakult.de/uploads/media/120w@2x/06/322086-ee7e50b0dc18b6c550941e0434ee.jpg?v=1-0 "[DL] Siggnature small parts, consumables & cleaning")
Manufacturer: Siggnature
![[DL] Siggnature chemicals](https://www.mofakult.de/uploads/media/120w@2x/07/322087-20f6b6fdaf9d9ec266058fe9923d.jpg?v=1-0 "[DL] Siggnature chemicals")
Manufacturer: Siggnature
Manufacturer: Siggnature
Hole pattern [mm]: 60 x 40 · Material: Sealing paper, Sealing carton, Aluminum, Fiber, Copper · Number of components: 14 pcs · Hole spacing inlet: 32 mm · Ø outlet inside: 13.3 mm · Area of application: Standard
Manufacturer: GPO · Material: NBR · Ø inside: 12.8 mm · Ø outside: 19 mm · Thickness: 2.4 mm · Pony OEM number: A3844 · Sachs OEM no.: 0650 017 000
Manufacturer: NSK · Material: Steel, Brass · Area of application: Standard · Bearing type: Shoulder bearing · Stock number: BO15 · Ø inside: 15 mm · Ø outside: 40 mm · Width: 10 mm · Inner ring width: 10 mm · Ball bearing closed: No · Bearing cage: Brass cage ball-guided · Pony OEM number: A4502 · Sachs OEM no.: 0932 007 001
Manufacturer: swiing® revival parts · Material: Steel · Area of application: Standard, High End · Bearing type: Deep groove ball bearing · Stock number: E15 · Bearing clearance: CN (standard) · Ø inside: 15 mm · Ø outside: 35 mm · Width: 8 mm · Inner ring width: 25.6 mm · Bearing cage: Sheet steel cage ball-guided · Thread type: MF20.8x1 LH (fine/left-hand thread) · Pony OEM number: A2531 · Sachs OEM no.: 0286 079 105
Manufacturer: swiing® revival parts · Material: Steel, Composite materials · Recording type: Interlocking · Ø inside: 29.7 mm, 36 mm · Ø outside: 93.7 mm · Number of slats: 2 pcs · Thickness: 3.3 mm · Area of application: Standard · Pony OEM number: A3887 · Sachs OEM no.: 0659 010 006
Pony OEM number: A3884 · Sachs OEM no.: 0659 006 000 · Manufacturer: swiing® revival parts
Manufacturer: swiing® revival parts · Spring design: Pressure spring · Pony OEM number: A1325 · Sachs OEM no.: 0239 015 000
Material: Steel · Surface: galvanized (blue) · Number of lobes: 1 pcs · Ø inside: 21 mm · Ø outside: 32 mm · Thickness: 0.5 mm
Manufacturer: swiing® revival parts · Material: Chrome steel (colloquially known as stainless steel) · Number of lobes: 1 pcs · Thickness: 0.5 mm · Pony OEM number: A1717 · Sachs OEM no.: 0246 049 000, A1717 · Ø inside: 10.2 mm · Ø outside: 23 mm
Manufacturer: swiing® revival parts · Material: Rubber · Ø Cable bushing: 5.2 mm · Ø mounting hole: 8.5 mm · Ø outside: 10.5 mm · Ø Bundle: 10.5 mm · Waistband height: 3 mm · Color: black · Pony OEM number: A4520, A4521 · Sachs OEM no.: 0960 135 000, 0960 136 000
Material: Rubber · Ø Cable bushing: 2.2 mm · Ø mounting hole: 8.5 mm · Ø outside: 12.8 mm · Ø Bundle: 10.5 mm · Waistband height: 2 mm · Total length: 7 mm · Color: black · Pony OEM number: A1923 · Sachs OEM no.: 0260 020 000
Manufacturer: swiing® revival parts · Material: Steel · Surface: blank / oiled · Ø inside: 12.5 mm, 15.2 mm · Ø outside: 18 mm, 21 mm · Thickness: 0.1 mm, 0.15 mm, 0.2 mm, 0.4 mm, 0.45 mm, 0.5 mm, 1 mm · Nominal diameter inside: 13 mm
| Sachs | 503 - AAL , ABL |
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