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Amazon.com: Motorcycle AM6 70cc 90cc Cylinder Head 47mm 49mm,AM6 49mm 90cc Big Bore Cylinder Kit & Crankshaft For,GOOFIT 47mm Cylinder Head for 70cc Dirt Bikes - High Quality,Amazon.com: 49mm 90cc Big Bore Cylinder Kit & Head for,TB 70cc/47mm Cylinder - Stock Honda 70 - TBparts.com

• PRECISION CRAFTSMANSHIP: The manufacturing process of the cylinder head is excellent, the precision of each part in the size and shape, ensuring a perfect fit with the engine
• Optimized valve design: valve construction and size are optimized to improve intake and exhaust efficiency and increase engine performance
• Reduces Noise and Vibration: The streamlined structure design reduces engine noise and vibration to improve driving comfort
• ENHANCED HEAT CAPACITY: Excellent heat dissipation channel and heat dissipation area can effectively reduce engine operating temperature and ensure stable operation
• Easy to install and debug: The installation procedure of the product is simple and clear, and it is easy to debug after installation to achieve optimal working condition

The inner diameter of the 70cc cylinder head is 47mm.
The inner diameter of the 90cc cylinder head is 49mm.
This product fits the following models:
Furia Cross 50 2000-2004 (AM6)
Furia Enduro 50 LC 2T 1997-2004 (AM6)
Furia Fan Bike 50 SM 2000-2002 (AM6)
Furia Max Enduro 50 LC 2T 2005-2010 (AM6)
Furia Max SM 50 LC 2T 2005 (AM6)
Furia SM 50 LC 2T 1997-2010 (AM6)
RX 50 LC 2T 2000-2004 (AM6)
RX 50 LC 2T 2005-2007 (AM6)
Racing 50 RX 2000-2010 (AM6)
RX-R 50 LC 2T 2008 (AM6)
RYZ Enduro 50 LC 2T 2002-2004 (AM6)
RYZ Enduro 50 LC 2T 2005-2010 (AM6)
RYZ Pro Enduro 50 LC 2T 2003-2004 (AM6)
RYZ Pro Enduro 50 LC 2T 2005 (AM6)
RYZ 50 Pro Racing Enduro 2006-2010 (AM6)
RYZ 50 Pro Racing Super Motard 2006-2010 (AM6)
RYZ 50 Pro Racing Urban Bike 2006-2010 (AM6)
RYZ Pro SM 50 LC 2T 2003-2004 (AM6)
RYZ Pro SM 50 LC 2T 2005 (AM6)
RYZ Pro Urban Bike 50 LC 2T 2006-2010 (AM6)