41mm tuning cylinder with square intake for Sachs 3- and 4-speed engines with blower cover, which was used on Hercules 50/ALS 50/2 S 50/KS 50/2 DK 50/3 LS 50/4 LKS, Gritzner etc., among others.
The smaller cooling fins facilitate installation on a Swiss Sachs 50/2 (502) engine, as the fan cowl can be fitted without any adjustments. However, adjustments in the area of the stud bolt holes are essential.
The cylinder should preferably be used with a 17 mm Bing SSB carburetor.
Exhaust thread: M40x1.5
Ø outer: ~92 mm
Ø bore: 41.01 mm
Ø piston: 40.94 mm
For matching add-on parts, see accessories.
Good, inexpensive standard spare part. GPO – GOOD PARTS ONLY.
The set includes the following fixed parts:
Manufacturer: GPO · Nominal diameter: 40 mm · Ø outside piston (A): 40.94 mm · Ø piston pin (B): 12 mm · Compression height (C): 28 mm · Curvature (D): 3.2 mm · Total piston height (E): 49.4 mm · Number of piston rings (F): 2 pcs · Piston ring mold: Rectangular ring · Piston ring impact: Internal fuse (IS) · Piston ring height: 1.5 mm · Thick piston ring: 1.8 mm · Piston weight: 86 g
Manufacturer: GPO · Material: Gray cast iron · Surface: raw · Displacement: 55 ccm · Crankshaft stroke: 42 mm · Nominal diameter: 41 mm · Ø Outlet outside: 40 mm · Hole spacing inlet: 31 mm · Outlet type: Union nut · Cooling type: Fan air cooling · Number of fixing points: 4 pcs · Area of application: Tuning
Material: Copper · Ø inside: 30.6 mm · Ø outside: 37.8 mm
Hole pattern [mm]: 40.5 x 51 · Manufacturer: swiing® revival parts · Material: Oiled paper · Place of use: Cylinder base · Thickness: 0.5 mm
Place of use: Admission · Thickness: 2.6 mm · Hole spacing inlet: 30 mm
Manufacturer: swiing® revival parts · Material: Steel · Surface: galvanized (blue) · Area of application: Standard · Diameter: 4.9 mm · Thread type: M5x0.8 (standard thread) · Total length: 23 mm · Thread length: 6 mm, 12 mm · Pony OEM number: A3700 · Sachs OEM number: 0640 016 101, 0640 016 102
Details
| Manufacturer | GPO |
| Material | Gray cast iron |
| Displacement | 55 ccm |
| Area of application | Tuning |
| Surface | sandblasted |
| Crankshaft stroke | 42 mm |
| Ø piston pin (B) | 12 mm |
| Nominal diameter | 41 mm |
| Camouflaged | No |
| Hole pattern [mm] | 51 x 40 |
| Thread inlet | M5x0.8 (standard thread) |
| Number of fixing points | 4 pcs |
| Outlet type | Union nut |
| Thread outlet | MF40x1.5 (fine pitch thread) |
| Hole spacing inlet | 31 mm |
Suitable for the following models
| Sachs | 50 (Fahrtwind, 1.25 / 1.5 PS, DE) 50/3 50/4 - MLFB (2.6 PS), LKH (4.5 PS) |
Accessories & related products
Carburetor 17 mm Bing SSB 1/17/69 reproduction
Material: Aluminum · Area of application: Standard · Area of application: Tuning · Total length: 116 mm · Carburetor type: SSB · Width: 86 mm · Nominal diameter: 17 mm · Height: 99 mm · Camouflaged: No · Ø fuel hose connection: 6.2 mm · Mixed oil connection: No · Vacuum connection: Yes · Choke control: without choke · Nozzle thread: MF7x0.75 (fine pitch thread) · Mounting type: Stud bolts & nuts · Nozzle size: 76 · Hole spacing inlet: 31 mm · Clamping screw torque (max.): 3 N/m · Clamping screw torque (max.): 4 N/m
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GPO 41 mm cylinder | Sachs 50/3, 50/4 (square inlet) fan-cooled (DE)
Manufacturer: GPO · Material: Gray cast iron · Surface: raw · Displacement: 55 ccm · Crankshaft stroke: 42 mm · Nominal diameter: 41 mm · Ø Outlet outside: 40 mm · Hole spacing inlet: 31 mm · Outlet type: Union nut · Cooling type: Fan air cooling · Number of fixing points: 4 pcs · Area of application: Tuning
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GPO piston 40.94 mm | Sachs 502, 50/2, 50/3, 50/4
Manufacturer: GPO · Nominal diameter: 40 mm · Ø outside piston (A): 40.94 mm · Ø piston pin (B): 12 mm · Compression height (C): 28 mm · Curvature (D): 3.2 mm · Total piston height (E): 49.4 mm · Number of piston rings (F): 2 pcs · Piston ring mold: Rectangular ring · Piston ring impact: Internal fuse (IS) · Piston ring height: 1.5 mm · Thick piston ring: 1.8 mm · Piston weight: 86 g
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swiing® ingenious cylinder head gasket 41 mm | Sachs 503, 502, 50/2, 50/3, 50/4
Manufacturer: swiing® ingenious parts · Material: Aluminum · Place of use: Cylinder head · Thickness: 0.3 mm · Nominal diameter: 41 mm · Ø inside: 41.7 mm · Ø cylinder: 41 mm · Hole pattern [mm]: 37 x 37 · Area of application: Standard
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Manufacturer: swiing® revival parts · Thread type: M5x0.8 (standard thread) · Thread length: 6 mm · Thread length: 12 mm · Total length: 23 mm · Diameter: 4.9 mm · Area of application: Standard · Material: Steel · Surface: galvanized (blue) · Pony OEM number: A3700 · Sachs OEM number: 0640 016 101 · Sachs OEM number: 0640 016 102
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GPO piston 40.94 mm | Sachs 502, 50/2, 50/3, 50/4
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