Cylinder kit including cylinder head from swiing with 39mm bore and 50cc displacement suitable for vehicles with Zündapp engine type 247 (type 247-71). High-quality reproduction of the original 39mm cylinder. This was installed in Zündapp models such as Belmondo, Bergsteiger M25/M50, as well as Alpa Spezial 3000 and Alpa Black River.
Features and benefits:
Correctly adjusted, this kit achieves 1.6 hp at the rear wheel.
Nikasil coating for smooth running, optimum heat dissipation and lubrication and therefore a long service life
Optimized mixture flow thanks to split transfer ports
Secure guidance due to fit on the cylinder head
Non-porous and flat surface
Face-milled sealing and connection surfaces
Cylinder kit including VERTEX pistons, two silent blocks for the cylinder head and stud bolts for intake and exhaust
Dimensions:
Nominal diameter: 39mm
Displacement: 50ccm
Material: aluminum
Surface: sandblasted
Crankshaft stroke: 42mm
Cylinder neck diameter: 48mm
Diameter inlet inside: 9.2mm
Hole spacing intake: 40mm
Hole spacing outlet: 40mm
Thread inlet: M6x1 (standard thread)
Thread outlet: M6x1 (standard thread)
Number of fixing points: 4
Hole pattern: 44x42mm
Piston pin diameter: 18.5 mm
Outlet type: angled
Installation instructions:
The original stud bolts of the engine housing are too short due to the height of the cylinder kit and must be replaced by longer bolts.
For Zündapp engines with an 85 mm short connecting rod, this must first be converted to a long connecting rod with a length of 91 mm (center - center) in order to use the cylinder.
Features and benefits:
Correctly adjusted, this kit achieves 1.6 hp at the rear wheel.
Nikasil coating for smooth running, optimum heat dissipation and lubrication and therefore a long service life
Optimized mixture flow thanks to split transfer ports
Secure guidance due to fit on the cylinder head
Non-porous and flat surface
Face-milled sealing and connection surfaces
Cylinder kit including VERTEX pistons, two silent blocks for the cylinder head and stud bolts for intake and exhaust
Dimensions:
Nominal diameter: 39mm
Displacement: 50ccm
Material: aluminum
Surface: sandblasted
Crankshaft stroke: 42mm
Cylinder neck diameter: 48mm
Diameter inlet inside: 9.2mm
Hole spacing intake: 40mm
Hole spacing outlet: 40mm
Thread inlet: M6x1 (standard thread)
Thread outlet: M6x1 (standard thread)
Number of fixing points: 4
Hole pattern: 44x42mm
Piston pin diameter: 18.5 mm
Outlet type: angled
Installation instructions:
The original stud bolts of the engine housing are too short due to the height of the cylinder kit and must be replaced by longer bolts.
For Zündapp engines with an 85 mm short connecting rod, this must first be converted to a long connecting rod with a length of 91 mm (center - center) in order to use the cylinder.
