40.0 mm piston with two 1.5 mm rectangular piston rings with internal locking (IS) for Cilo Cross 521 & 512, Pony Cross 521, Pony GTX 521 mopeds / mopeds.
The detailed dimensions of the piston according to the technical drawing can be found in the details. You can also find out about the relevant piston rings, their stems and locking types on the legend in the pictures.
| Nominal diameter | 40 mm |
| Manufacturer | Meteor |
| Ø outside piston (A) | 39.95 mm |
| Compression height (C) | 27.9 mm |
| Curvature (D) | 4.15 mm |
| Total piston height (E) | 52 mm |
| Number of piston rings (F) | 2 pcs |
| Piston ring mold | Rectangular ring |
| Piston ring impact | Flank safety device (FS) |
| Piston ring height | 1.5 mm |
| Ø piston pin (B) | 12 mm |
| Weight piston kit | 83 g |
| Pony / Cilo (Beta 521 & 512) | Beta 512 Beta 521 (engine) |
Accessories & related products
GPO piston pin extractor Ø 10, 12, 14 mm
Manufacturer: GPO · Material: Steel · Surface: burnished · Diameter: 10 mm · Diameter: 12 mm · Diameter: 14 mm · Total length: 130 mm · Area of application: (Dis)assembly tool · Number of components: 7 pcs · Width across flats: 10 mm · Width across flats: 17 mm
CHF 19.90
Explore categories from Piston
Moped fans also bought
swiing® revival stud bolt inlet/outlet M6 x 30 (10.9 strength)
Manufacturer: swiing® revival parts · Material: Steel · Surface: galvanized (blue) · Thread type: M6x1 (standard thread) · Diameter: 5.95 mm · Nominal diameter (thread): 6 mm · Total length: 30 mm · Thread length: 12 mm · Strength class: 10.9
CHF 1.80
swiing® revival gasket set cylinder original engine | Beta 521, 512
Manufacturer: swiing® revival parts · Material: Copper · Material: Sealing carton · Material: Sealing paper · Material: Sheet metal (steel) · Ø cylinder: 40 mm · Ø outlet inside: 22 mm · Number of components: 3 pcs · Hole pattern [mm]: 48 x 48 mm · Hole spacing outlet: 40 mm · Decompressor: Yes · Area of application: Original
CHF 13.90
Headlight original | Pony Cross, GTX (P8272)
Manufacturer: Pony · Housing material: Plastic · Thread size: M5 · Lens material: Plastic · Color: black · Tension: 12 V · Bulb holder: P26s · Width: 158 mm · Performance: 15 W · Speedometer recording: None · Depth: 87 mm · Height: 93 mm · Switch included: No · Battery operated: No · Number of fixing points: 2 pcs · Test mark: E2 · Mounting type: Screws · Area of application: Standard
CHF 79.90
GPO gasket 0.5 mm cylinder head 40 mm cylinder | Pony GTX, Cross 521
Ø inside: 40.5 mm · Manufacturer: GPO · Material: Aluminum · Nominal diameter: 40 mm · Ø cylinder: 40 mm · Place of use: Cylinder head · Hole pattern [mm]: 48 x 48 · Thickness: 0.5 mm · Alternative version of the Pony OEM number: A8098
CHF 2.90
GPO 40 mm cylinder (without piston & gasket set) "original" | Pony GTX, Cross 521
Manufacturer: GPO · Material: Gray cast iron · Nominal diameter: 40 mm · Displacement: 50 ccm · Ø cylinder neck: 45 mm · Number of fixing points: 4 pcs · Hole spacing for cylinder mounting: 48 mm · Outlet type: straight · Hole spacing outlet: 39 mm · Area of application: Original
CHF 89.90
GPO 40 mm cylinder kit (Meteor Edition) "original" | Pony GTX, Cross 521
Manufacturer: GPO · Material: Gray cast iron · Nominal diameter: 40 mm · Displacement: 50 ccm · Ø cylinder neck: 45 mm · Ø outlet inside: 21.5 mm · Ø piston pin (B): 12 mm · Hole pattern [mm]: 48 x 48 · Outlet type: straight · Hole spacing outlet: 39 mm · Thread outlet: M6x1 (standard thread) · Area of application: Original
CHF 149.90
Attention: new opening hours from 16.02.2026 & new evening sale on Thursday 17:30-20:00
