
Cylinder head compatible with Cilo Cross, Pony Cross, and GTX mopeds equipped with a Beta 521 or 512 engine.
The high-compression cylinder head features high-quality craftsmanship and a precise fit. With a squish edge reduced by 1.1 mm compared to the original head, it now measures 2.5 mm instead of 3.6 mm (measured with the original 1 mm-thick gasket). A lower squish edge ensures better combustion due to increased turbulence in the combustion chamber, which noticeably boosts power and efficiency.
Note: A spark plug with a long thread is required.
If you want to reduce the compression edge even further, you’ll find 0.3- and 0.5-mm-thick gaskets in the accessories section.
A good, affordable standard replacement part. GPO – GOOD PARTS ONLY.
Alternative to the original Pony part number: A8113
| Manufacturer | GPO |
| Material | Aluminum |
| Camouflaged | Yes |
| Surface | varnished |
| Total length | 120 mm |
| Width | 108 mm |
| Ø cylinder | 40 mm |
| Number of fixing points | 4 pcs |
| Ø screw holder | 6.5 mm |
| Candle thread | short |
| Hole pattern [mm] | 48 x 48 |
| Alternative version of the Pony OEM number | A8113 |
| Pony / Cilo (Beta 521 & 512) | Beta 512 Beta 521 (engine) |
Accessories & related products
GPO 40 mm cylinder head "original" | Pony GTX, Cross 521 (A8113)
Manufacturer: GPO · Material: Aluminum · Surface: varnished · Ø cylinder: 40 mm · Number of fixing points: 4 pcs · Ø screw holder: 6.5 mm · Hole pattern [mm]: 48 x 48 · Candle thread: short · Total length: 120 mm · Width: 108 mm · Pony OEM number: A8113
CHF 64.90
GPO 43.5 mm cylinder head Airsal cylinder | Pony GTX, Cross 521 (A8113)
Manufacturer: GPO · Material: Aluminum · Surface: varnished · Ø cylinder: 43.5 mm · Camouflaged: Yes · Number of fixing points: 4 pcs · Ø screw holder: 6.5 mm · Hole pattern [mm]: 48 x 48 · Candle thread: short · Total length: 120 mm · Width: 108 mm · Area of application: Racing · Area of application: Tuning · Alternative version of the Pony OEM number: A8113
CHF 74.90
GPO gasket 0.3 mm cylinder head 40 mm cylinder | Pony GTX, Cross 521
Manufacturer: GPO · Material: Aluminum · Place of use: Cylinder head · Thickness: 0.3 mm · Nominal diameter: 40 mm · Ø inside: 40.5 mm · Ø cylinder: 40 mm · Hole pattern [mm]: 48 x 48 · Alternative version of the Pony OEM number: A8098
CHF 2.90
GPO gasket 0.5 mm cylinder head 40 mm cylinder | Pony GTX, Cross 521
Manufacturer: GPO · Material: Aluminum · Place of use: Cylinder head · Thickness: 0.5 mm · Nominal diameter: 40 mm · Ø inside: 40.5 mm · Ø cylinder: 40 mm · Hole pattern [mm]: 48 x 48 · Alternative version of the Pony OEM number: A8098
CHF 2.90
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GPO gasket 0.3 mm cylinder head 40 mm cylinder | Pony GTX, Cross 521
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GPO gasket 0.5 mm cylinder head 40 mm cylinder | Pony GTX, Cross 521
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GPO 40 mm cylinder (without piston & gasket set) "original" | Pony GTX, Cross 521
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