cylinder kit swiing 39mm tuning for Zündapp Bergsteiger (type 247)

Cylinder kit with 39mm bore for Zündapp Bergsteiger.

Suitable for mopeds with Zündapp type 247 engine. This was installed in Zündapp models such as Belmondo, Bergsteiger M25 / M50, as well as Alpa Spezial 3000 and Alpa Black River.

Correctly adjusted, the kit achieves 2.8 HP on the rear wheel. When installed, the racing cylinder does not look any different from the original. You get even more power with a 44 mm tuning cylinder.

Features and benefits:

• Trapezoidal outlet window
• Maximum passage through rectangular inlet
• Nikasil coating for smooth running, optimal heat dissipation and lubrication as well as durability
• Optimized fuel-air mixture flow through split transfer channels
• centered cylinder head
• Pore-free and flat surface
• Plane-milled sealing and connection surfaces

Cylinder kit including VERTEX piston, two silent blocks for the cylinder head and stud bolts for inlet and outlet.