More power, less talking
GPO Ø 41 mm "Sombrero" cylinder kit | Puch X30 Velux, NG-2AH
Nominal diameter: 41 mm · Manufacturer: GPO · Material: Gray cast iron · Displacement: 57 ccm · Crankshaft stroke: 43 mm · Ø cylinder neck: 44.7 mm · Ø outlet inside: 25 mm · Ø Inlet inside: 19 mm · Thread inlet: M6x1 (standard thread) · Hole spacing inlet: 32 mm · Ø piston pin (B): 10 mm · Ø piston pin (B): 12 mm · Outlet type: straight · Hole spacing outlet: 42 mm · Thread outlet: M6x1 (standard thread) · Number of fixing points: 4 pcs · Hole pattern [mm]: 44 x 44 · Decompressor: No · Camouflaged: No · Area of application: Tuning
CHF 199.90
GPO 43 mm "Pomodoro" cylinder kit | Sachs 503
Nominal diameter: 43 mm · Manufacturer: GPO · Material: Gray cast iron · Area of application: Tuning · Displacement: 63 ccm · Crankshaft stroke: 43 mm · Ø cylinder neck: 45 mm · Ø Outlet outside: 26 mm · Ø outlet inside: 22 mm · Ø Inlet inside: 19 mm · Thread inlet: M6x1 (standard thread) · Hole spacing inlet: 32 mm · Ø piston pin (B): 12 mm · Outlet type: clamped · Hole pattern [mm]: 40 x 60 / 37 x 37
CHF 224.90
GPO 41 mm cylinder | Sachs 50/3, 50/4 (square inlet) fan-cooled (DE)
Nominal diameter: 41 mm · Manufacturer: GPO · Material: Gray cast iron · Surface: raw · Displacement: 55 ccm · Crankshaft stroke: 42 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
CHF 97.90
GPO 44 mm cylinder kit tuning 12 mm KoBo | Tomos A35
Nominal diameter: 44 mm · Manufacturer: GPO · Material: Aluminum · Surface: sandblasted · Displacement: 65 ccm · Crankshaft stroke: 43 mm · Ø cylinder neck: 47.8 mm · Ø outlet inside: 22.8 mm · Inlet window: 35.5 x 29.5 · Thread inlet: M5x0.8 (standard thread) · Hole spacing inlet: 36 mm · Hole spacing inlet: 39 mm · Ø piston pin (B): 12 mm · Outlet type: slanted · Number of fixing points: 4 pcs · Hole spacing outlet: 42 mm · Thread outlet: M6x1 (standard thread) · Hole pattern [mm]: 44 x 44 · Decompressor: No · Camouflaged: No · Area of application: Tuning
CHF 89.90
GPO 45 mm cylinder kit 70 ccm | Puch
Manufacturer: GPO · Material: Aluminum · Camouflaged: No · Surface: sandblasted · Crankshaft stroke: 43 mm · Displacement: 70 ccm · Number of fixing points: 4 pcs · Hole spacing inlet: 38 mm · Ø cylinder neck: 47.8 mm · Nominal diameter: 45 mm · Ø outlet inside: 23.4 mm · Ø piston pin (B): 12 mm · Inlet window: 21.4 x 13.5 · Thread inlet: M6x1 (standard thread) · Hole spacing outlet: 42 mm · Hole pattern [mm]: 44 x 44 · Outlet type: straight · Thread outlet: M6x1 (standard thread) · Area of application: Tuning · Decompressor: No
CHF 99.90
GPO 41 mm cylinder kit fan-cooled diaphragm | Sachs 50/2, 50/3, 50/4 (DE)
Nominal diameter: 41 mm · Manufacturer: GPO · Material: Gray cast iron · Surface: sandblasted · Displacement: 55 ccm · Crankshaft stroke: 42 mm · Thread inlet: M5x0.8 (standard thread) · Hole spacing inlet: 67 mm · Ø piston pin (B): 12 mm · Outlet type: Union nut · Number of fixing points: 4 pcs · Thread outlet: M35x2 (standard thread) · Hole pattern [mm]: 51 x 40 · Camouflaged: No · Area of application: Tuning
CHF 152.90
GPO 38 mm original cylinder fan-cooled 12 mm KoBo | Velux/NG-2AH
Nominal diameter: 38 mm · Manufacturer: GPO · Material: Gray cast iron · Surface: sandblasted · Displacement: 50 ccm · Crankshaft stroke: 43 mm · Thread inlet: M6x1 (standard thread) · Hole spacing inlet: 32 mm · Ø piston pin (B): 12 mm · Outlet type: straight · Hole spacing outlet: 42 mm · Thread outlet: M6x1 (standard thread) · Number of fixing points: 4 pcs · Hole pattern [mm]: 44 x 44 · Camouflaged: No · Area of application: Standard
CHF 124.90
GPO 41 mm "Sombrero" cylinder kit | Puch M50, MS50, VS50, DS50, VZ50
Nominal diameter: 41 mm · Manufacturer: GPO · Material: Gray cast iron · Displacement: 57 ccm · Crankshaft stroke: 43 mm · Ø cylinder neck: 43 mm · Ø outlet inside: 25 mm · Ø Inlet inside: 19 mm · Thread inlet: M6x1 (standard thread) · Hole spacing inlet: 42 mm · Ø piston pin (B): 10 mm · Ø piston pin (B): 12 mm · Outlet type: straight · Hole spacing outlet: 42 mm · Thread outlet: M6x1 (standard thread) · Number of fixing points: 4 pcs · Hole pattern [mm]: 44 x 44 · Decompressor: No · Camouflaged: No · Area of application: Tuning
CHF 199.90
GPO 40 mm cylinder kit | Solex
Manufacturer: GPO · Material: Aluminum · Camouflaged: No · Surface: sandblasted · Nominal diameter: 40 mm · Ø piston pin (B): 12 mm · Number of fixing points: 4 pcs · Ø Inlet inside: 10 mm · Ø outlet inside: 15 mm · Thread inlet: M6x1 (standard thread) · Hole spacing outlet: 32.5 mm · Hole pattern [mm]: 41.5 · Outlet type: straight · Thread outlet: M6x1 (standard thread) · Area of application: Tuning · Decompressor: Yes · Hole spacing inlet: 32.5 mm
CHF 108.90
GPO 41 mm cylinder kit square inlet | Sachs 50/3, 50/4 LKH
Nominal diameter: 41 mm · Manufacturer: GPO · Material: Gray cast iron · Surface: sandblasted · Displacement: 55 ccm · Crankshaft stroke: 42 mm · Thread inlet: M5x0.8 (standard thread) · Hole spacing inlet: 31 mm · Ø piston pin (B): 12 mm · Outlet type: Union nut · Thread outlet: MF40x1.5 (fine pitch thread) · Number of fixing points: 4 pcs · Hole pattern [mm]: 51 x 40 · Camouflaged: No · Area of application: Tuning
CHF 152.90
Retracting cylinders – how to do it correctly
Although pistons, rings, and cylinders are manufactured with precision, they do not yet fit together perfectly. During the running-in process, they slowly grind themselves into place—and this is the only way to achieve a clean fit without material breakouts. Driving at full throttle immediately after assembly can cause serious damage.
Here's how to do it correctly:
- Warm up at idle speed: After starting the engine, let it idle for about 10–15 minutes. This allows the oil to distribute evenly in the cylinder.
- The first few kilometers: Only use half throttle at moderate speed (max. 5000–6000 rpm); occasional speed jumps allow the contact surfaces to run in smoothly. Avoid long hill climbs or high revs during the first 100 km.
- Be patient: After about an hour of running-in time (instead of the old myths of 300 km or 10 hours of running time), you can carefully move on to longer, heavier loads. Approach more load and revs cautiously.
- Take breaks: Allow the engine to rest, especially after periods of stress, as friction causes thermal build-up. This protects against heat damage and warping problems.
- Additional lubrication: Add 50–100 ml of extra 2-stroke oil to the first few tank fillings – this helps with smooth running-in.
Conclusion:
Only with tact and care can you achieve long-lasting and powerful performance. The right temperature, varying speed, and gentle load ensure a cleanly run-in cylinder – and real driving pleasure without consequential damage.
swiing® ingenious ignition cams +/- 2° Athena / Jasil crankshaft | Piaggio Ciao, SI, Bravo, Boxer
Manufacturer: swiing® ingenious parts · Material: Chrome steel (known as Nirosta®) · Surface: electropolished · Total length: 9.5 mm · Ø inside: 14.4 mm · Alternative version of the Piaggio OEM number: 103137
CHF 22.90
swiing® ingenious ignition cams +/- 4° Athena / Jasil crankshaft | Piaggio Ciao, SI, Bravo, Boxer
Manufacturer: swiing® ingenious parts · Material: Chrome steel (known as Nirosta®) · Surface: electropolished · Ø inside: 14.4 mm · Total length: 9.5 mm · Alternative version of the Piaggio OEM number: 103137
CHF 22.90
CEV lamp pot Ø 130 mm black NOS
Manufacturer: CEV · Material: Sheet metal (steel) · Surface: varnished · Color: black · Ø External connection: 124.2 mm · Ø outside: 130 mm · Total length: 70 mm · Thread size: M6 · Width: 132.7 mm · Mounting type: Screws · Number of fixing points: 2 pcs · CEV OEM number: 04601 04785
CHF 99.90
OMG fuel filter "T" metal 8 mm (removable)
Manufacturer: OMG · Material: Plastic · Material: Steel · Surface: galvanized (yellow) · Filter type: Plastic net · demountable: Yes · Color: transparent · Ø outside: 22.5 mm · Outer width: 52 mm · Ø inside: 3.8 mm · Ø inside: 4.6 mm · Ø fuel hose connection: 8 mm · Total length: 58.8 mm
CHF 11.70
swiing® revival wheel axle set cast rim front | Hercules Prima, Optima
Manufacturer: swiing® revival parts · Material: Chrome steel (known as Nirosta®) · Material: Steel · Surface: galvanized (blue) · Thread type: MF11x1 (fine pitch thread) · Ø shaft: 11 mm · Total length: 145 mm · Thread length: 55 mm · Thread length: 65 mm · Shank length: 25 mm · Ball bearing closed: No · Ø ball [inch] / [mm]: 1/4" (6.35 mm) · Hercules OEM number: 0871 207 100
CHF 34.90
Air filter set swiing® ingenious SRF 17 mm | Puch X30 NS, NL
Manufacturer: Made in Switzerland · Material: Plastic · Total length: 350 mm · Filter type: Racing screen · Filter type: Standard sieve · Color: black · Ø Internal connection: 27 mm · Mounting type: Plug connection clamped · Mounting type: Tab for screwing · Area of application: Racing · Area of application: Tuning · Alternative version of the Puch OEM number: 321.2.15.270.0 · Puch OEM number: 321.2.15.270.0
CHF 79.90
Order today – delivered tomorrow!
Your project can't wait? No problem! Thanks to our express shipping until 7 p.m., we'll get your order on its way in record time. That means you can shop for parts today and start working on your moped tomorrow.
What are you waiting for? It pays to be quick!
Our favorite manufacturers
Collection only possible with online purchase and appointment.
