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The legend is back! The legendary 43.5 mm Metrakit racing cylinder from days gone by has risen like a phoenix from the ashes and is reigniting the passion in your Puch Maxi S, N, X30 Sport NS, NL, as well as Supermaxi LG1 and LG2 mopeds.
The aluminum cylinder with a gray cast iron liner is an optimized replica of the original Metrakit racing cylinder. The valve timing has been revised compared to the original and features more exhaust advance, making the well-known piston seizure problem caused by excessive heat a thing of the past. In addition, the cylinder height has been precisely adjusted, so the extra-thick base gasket that was previously required is now unnecessary.
This GPO racing cylinder is among the strongest and most powerful in its class and has been extensively tested. It delivers robust torque across the entire power band and offers impressively powerful performance. Thanks to the optimizations compared to the original, the cylinder also reaches a noticeably higher RPM, which ensures even more power and driving fun.
To get the most out of this tuned cylinder, we recommend using at least a 15-mm carburetor. However, you’ll achieve noticeably more power with a 17-mm carburetor. Thanks to the generous 19-mm intake, you’ll have plenty of headroom for optimal power delivery.
Note: The cylinder is shipped loose and without a piston, gasket set, studs, or other mounting parts.
A high-quality, affordable standard replacement part. GPO – GOOD PARTS ONLY.
| Manufacturer | GPO |
| Camouflaged | No |
| Material | Aluminum, Gray cast iron |
| Displacement | 64 ccm |
| Surface | varnished |
| Crankshaft stroke | 43 mm |
| Nominal diameter | 43 mm |
| Ø cylinder neck | 47.8 mm |
| Ø outlet inside | 26 mm |
| Ø Inlet inside | 19 mm |
| Area of application | Tuning, Racing |
| Thread inlet | M6x1 (standard thread) |
| Hole spacing outlet | 42 mm |
| Ø piston pin (B) | 12 mm |
| Number of fixing points | 4 pcs |
| Hole pattern [mm] | 44 x 44 |
| Outlet type | straight |
| Thread outlet | M6x1 (standard thread) |
| Hole spacing inlet | 38 mm |
| Puch | E50 ZA50 (air-cooled) Z50 (X30 Sport) |
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