Full crank shaft 30 mm stroke.

Gives a higher pressure in the crank case for a better fuel-oxygen mixture. This gives the engine more power.

Only applicable to the following engines with thicker cylinder base gasket.

Fits engines like:

• Zenoah G230
• Zenoah G240
• Zenoah G260
• Zenoah G270
• Zenoah G290
• Chung Yang 23 cc
• Chung Yang 26 cc
• BWS 29 cc