Stage6 Cylinder Kit 70cc Sport Pro MK2 Aprilia / Piaggio AC. The first generation Sport Pro MK1 cylinders became very popular among scooter tuners, then Stage6 took things to the next level and introduced the successor, the Sport Pro MKII.
The cylinder was completely redesigned; 6 instead of 5 transfer ports ensure optimized cylinder filling. The oval exhaust remained but was optimized as well. The appearance is based on the pentagonal shape of the R/T cylinders. The head is a one-piece unit with cast scavenging canals for better heat dissipation. The piston is a replica of the R/T piston, with a domed piston crown and 0.8 mm thick piston ring to optimise performance and improve thermal stability.
The cylinder delivers 2 to 3 hp more power than the MK1, between 14-17 hp, without any additional modifications and in combination with the corresponding components. Maximum performance and outstanding robustness – we are sure that this cylinder will set new standards in the tuning scene.
We recommend using a reinforced crankshaft, a min. 19mm carburetor and a sport / racing exhaust to exploit the full power of this tuning cylinder..
The kit includes.
- aluminium cylinder, 47.6mm bore
- 1-ring piston with 12mm piston pin
- one-piece cylinder head
- gasket set
We recommend to clean the engine before assembly, check the condition of all components and use a new spark plug and new small end bearing. Do not forget to change your carburetor settings if necessary.
Squish clearance should be between 0.75 and 0.85. The cylinder should be run in for approx. 300 km with a 1:33 mixture to improve robustness and life expectancy.
– Original exhausts cannot be mounted with this cylinder.