Cylinder Stage6 70cc Racing MK2 12mm piston pin China 2-stroke AC / CPI / Keeway

Cylinder kit Stage6 Racing MK2 70cc

Cylinder Stage6 Racing 70cc MK2, 12mm piston pin, China 2-stroke AC. The successor to the successful Stage6 Racing 70cc cylinder is called Stage6 Racing MKII 70cc and comes in a completely revised version with more power out of the box.

Improvements and technical details Stage6 Racing aluminium cylinder

The aluminum cylinder with high-strength hard chrome coating has been completely redesigned:

• Transfer port design: instead of 5, now 6 transfer ports, which significantly improve cylinder filling.
• Piston design: New domed piston crown and 0.8 mm ring, inspired by the R/T piston, for more power and better thermal resilience.
• Optimized cooling: Generous scavenging of the split exhaust, 5-cornered design with internal cooling fins, one-piece cylinder head with cooling channels.
• Port timings: 190°-130°.

The cylinder delivers 2-3 hp more than the MK1 and achieves 17-19 hp in the standard configuration. With appropriate reworking, over 20 hp is possible, making it one of the most powerful 70cc kits on the market.

To exploit the full potential of this cylinder, we recommend the use of a reinforced crankshaft, a minimum 21 mm carburetor and a racing exhaust system.

Scope of delivery Stage6 Racing cylinder kit

• Aluminum cylinder 47.6mm diameter
• 1-ring piston with 12mm piston pin
• One-piece cylinder head
• Gasket set

Notes on installation and maintenance

Before installation, the engine and components should be cleaned and the condition checked. Use a new spark plug and a new piston pin bearing.
Adjust the carburetor settings to prevent tightening. During the running-in phase of 300 km, we recommend a mixture of 1:33 to ensure robustness and longevity.

Caution:

- Original exhausts cannot be fitted to this cylinder.
- The temperature sensor including the thread must not be longer than 18 mm, otherwise it may bump into the cylinder head.

WITHOUT ROAD APPROVAL