Sigg's Engine Overhaul Course | Sachs 503, 50/2, 50/3 (DE)

Engine Overhaul Course for Sachs 503, 50/2, and 50/3 (DE) manual transmission engines, in which you will perform a complete overhaul of your own engine under expert supervision.

This course is intended exclusively for manual transmission engines. Automatic transmission engines are not overhauled in this course.

What to expect from the course:
You don’t want to just take your engine apart haphazardly and hope it runs again afterward, do you? In this course, you’ll perform the complete engine overhaul yourself, with our support, the right tools, and a check after every important step.

We’ll walk you through the process step by step using a sample engine. Then you’ll apply what you’ve learned directly to your own engine. This way, you’ll not only know what needs to be done, but you’ll also understand why and what to look out for along the way.

Schedule over four course days:
Course Day 1:
Disassemble the engine, assess the condition of the individual components, and determine the necessary replacement parts. Together, we’ll figure out what your engine really needs. You’ll order the parts to be delivered directly to your home and bring them with you on the next course day.

Course Day 2:
Finish cleaning the parts and engine case, prepare the components, and set the correct clearance on the shafts.

Course Days 3 & 4:
Reassemble the engine step by step. We’ll check the important intermediate steps before moving on.

This course focuses solely on engine overhaul. You’ll handle the removal and installation of the engine, fine-tuning, and other work on the entire moped at home or here at our Open Garage.

The big advantage:
You do the work yourself, but you’re not on your own. We demonstrate each step, monitor your progress, and help you select the right parts. This helps you avoid unnecessary trial-and-error and unsuitable components as much as possible.

We exclusively install points-type or VEC ignition systems. We’re also happy to advise you on individual components such as cylinders, carburetors, exhausts, or tuning parts. However, these are not part of the actual engine overhaul.

Course Information:
Course dates, every Wednesday:
November 4, 2026
; November 11, 2026
; November 18, 2026
; November 25, 2026

Meeting time
: 1:15 p.m. Course start: 1:30 p.m.
Break: 3:00–3:15 p.m.
Course end (including cleanup): 5:30 p.m.

Number of participants: 3–6 people

Notes:
This course is intended exclusively for Sachs 503, 50/2, and 50/3 (DE) engines with manual transmissions. Automatic transmission engines are excluded from this course.
The cost of materials for your engine overhaul is not included in the course price.
As a rough estimate, you can expect additional material costs of approximately 600.- for a Sachs engine. This includes ball bearings, shaft seals, the crankshaft, the ignition system, and the necessary small parts.
Any additional parts that are required or desired—such as a clutch, cylinder, or tuning components—will incur further costs. In some cases, it’s not clear what’s actually needed until after the engine has been disassembled.
Everyone works on their own engine.
Your engine case must be in serviceable condition on the outside. Broken case parts or similar major damage should be ruled out before the course begins.
In exceptional cases, additional replacement parts must be arranged between course days. We do not keep replacement engine cases in stock.
We provide the workstation, hand tools, and hearing and eye protection.
Open-toed shoes are not permitted in the workshop.
A small selection of beverages is available for purchase on-site.

Disclaimer:
Please review the downloadable disclaimer. It must be printed out, signed, and brought to the course.

For minors, the second page must also be signed by a parent or legal guardian.

If you do not have access to a printer, copies are available on site. The form must be completed and signed before the course begins. For minors, the form can only be completed on site if a parent or legal guardian is present.