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 237.30
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
EUR 265.80
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
EUR 116.20
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
EUR 106.70
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 118.10
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
EUR 181.50
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
EUR 148.30
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 236.30
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 128.70
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
EUR 181.50
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 27.10
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 · Ø inside: 14.4 mm · Total length: 9.5 mm · Alternative version of the Piaggio OEM number: 103137
EUR 27.10
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
EUR 118.60
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
EUR 13.90
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
EUR 41.40
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
EUR 94.40
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