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
EUR 220.50
EUR 245.10
GPO 43 mm "Pomodoro" cylinder kit | Sachs 503
Manufacturer: GPO · Material: Gray cast iron · Crankshaft stroke: 43 mm · Displacement: 63 ccm · Hole spacing inlet: 32 mm · Ø cylinder neck: 45 mm · Ø Outlet outside: 26 mm · Nominal diameter: 43 mm · Ø Inlet inside: 19 mm · Ø outlet inside: 22 mm · Ø piston pin (B): 12 mm · Thread inlet: M6x1 (standard thread) · Hole pattern [mm]: 40 x 60 / 37 x 37 · Outlet type: clamped · Area of application: Tuning
EUR 275.70
GPO 41 mm cylinder | Sachs 50/3, 50/4 (square inlet) fan-cooled (DE)
Manufacturer: GPO · Material: Gray cast iron · Surface: raw · Crankshaft stroke: 42 mm · Displacement: 55 ccm · Number of fixing points: 4 pcs · Hole spacing inlet: 31 mm · Ø Outlet outside: 40 mm · Nominal diameter: 41 mm · Outlet type: Union nut · Cooling type: Fan air cooling · Area of application: Tuning
EUR 107.80
EUR 120.00
GPO 44 mm cylinder kit tuning 12 mm KoBo | Tomos A35
Manufacturer: GPO · Material: Aluminum · Camouflaged: No · Surface: sandblasted · Crankshaft stroke: 43 mm · Displacement: 65 ccm · Number of fixing points: 4 pcs · Hole spacing inlet: 36 mm · Hole spacing inlet: 39 mm · Ø cylinder neck: 47.8 mm · Nominal diameter: 44 mm · Ø outlet inside: 22.8 mm · Ø piston pin (B): 12 mm · Inlet window: 35.5 x 29.5 · Thread inlet: M5x0.8 (standard thread) · Hole spacing outlet: 42 mm · Hole pattern [mm]: 44 x 44 · Outlet type: slanted · Thread outlet: M6x1 (standard thread) · Area of application: Tuning · Decompressor: No
EUR 104.10
EUR 110.20
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
EUR 122.50
GPO 41 mm cylinder kit fan-cooled diaphragm | Sachs 50/2, 50/3, 50/4 (DE)
Manufacturer: GPO · Material: Gray cast iron · Camouflaged: No · Surface: sandblasted · Nominal diameter: 41 mm · Crankshaft stroke: 42 mm · Displacement: 55 ccm · Ø piston pin (B): 12 mm · Number of fixing points: 4 pcs · Thread inlet: M5x0.8 (standard thread) · Hole pattern [mm]: 51 x 40 · Outlet type: Union nut · Thread outlet: M35x2 (standard thread) · Area of application: Tuning · Hole spacing inlet: 67 mm
EUR 167.80
EUR 187.50
GPO 38 mm original cylinder fan-cooled 12 mm KoBo | Velux/NG-2AH
Surface: sandblasted · Nominal diameter: 38 mm · Manufacturer: GPO · Material: Gray cast iron · Displacement: 50 ccm · Crankshaft stroke: 43 mm · Thread inlet: M6x1 (standard thread) · Hole pattern [mm]: 44 x 44 · Hole spacing inlet: 32 mm · Ø piston pin (B): 12 mm · Number of fixing points: 4 pcs · Outlet type: straight · Hole spacing outlet: 42 mm · Thread outlet: M6x1 (standard thread) · Area of application: Standard · Camouflaged: No
EUR 134.70
EUR 153.10
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
EUR 245.10
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
EUR 133.50
GPO 41 mm cylinder kit square inlet | Sachs 50/3, 50/4 LKH
Manufacturer: GPO · Material: Gray cast iron · Camouflaged: No · Surface: sandblasted · Crankshaft stroke: 42 mm · Displacement: 55 ccm · Number of fixing points: 4 pcs · Hole spacing inlet: 31 mm · Nominal diameter: 41 mm · Ø piston pin (B): 12 mm · Thread inlet: M5x0.8 (standard thread) · Hole pattern [mm]: 51 x 40 · Outlet type: Union nut · Thread outlet: MF40x1.5 (fine pitch thread) · Area of application: Tuning
EUR 167.80
EUR 187.50
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
EUR 28.10
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 · Total length: 9.5 mm · Ø inside: 14.4 mm · Alternative version of the Piaggio OEM number: 103137
EUR 28.10
CEV lamp pot Ø 130 mm black NOS
Manufacturer: CEV · Material: Sheet metal (steel) · Surface: varnished · Color: black · Number of fixing points: 2 pcs · Total length: 70 mm · Width: 132.7 mm · Mounting type: Screws · Thread size: M6 · Ø outside: 130 mm · Ø External connection: 124.2 mm · CEV OEM number: 04601 04785
EUR 122.50
OMG fuel filter "T" metal 8 mm (removable)
Manufacturer: OMG · Material: Plastic · Material: Steel · Outer width: 52 mm · Surface: galvanized (yellow) · Color: transparent · Filter type: Plastic net · demountable: Yes · Total length: 58.8 mm · Ø inside: 3.8 mm · Ø inside: 4.6 mm · Ø fuel hose connection: 8 mm · Ø outside: 22.5 mm
EUR 14.30
swiing® revival wheel axle set cast rim front | Hercules Prima
Manufacturer: swiing® revival parts · Material: Chrome steel (known as Nirosta®) · Material: Steel · Surface: galvanized (blue) · Ø ball [inch] / [mm]: 1/4" (6.35 mm) · Ø shaft: 11 mm · Total length: 145 mm · Shank length: 25 mm · Thread type: MF11x1 (fine pitch thread) · Ball bearing closed: No · Thread length: 55 mm · Thread length: 65 mm · Hercules OEM number: 0871 207 100
EUR 42.80
Air filter set swiing® ingenious SRF 17 mm | Puch X30 NS, NL
Manufacturer: Made in Switzerland · Material: Plastic · Color: black · Filter type: Racing screen · Filter type: Standard sieve · Total length: 350 mm · 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
EUR 98.00
Fresh from the workshop, straight to your inbox!
With our newsletter, you'll never miss out on any promotions, new products, or news again.
We'll deliver the latest parts highlights, exclusive offers, and moped vibes straight to your digital mailbox.
Our favorite manufacturers
Collection only possible with online purchase and appointment.
