YX 70cc Kick Start Semi-Auto (Motor Only)

This YX 70cc engine is built on the classic Honda horizontal 2-bolt motor mount pattern, making it a direct bolt-in replacement for a wide range of Honda 50–70cc platforms, not just CT70. It retains the exact physical size of a stock CT70 motor, while upgrading airflow, ignition output, and overall performance.

Equipped with larger valves and a modern full-wave stator, this engine delivers strong usable power and reliable 12-volt lighting output (which can be regulated down to 6V) without changing the look or fitment of your bike. The semi-automatic transmission keeps things simple and rider-friendly — no clutch lever required.

This is an ideal engine for restorations, trail bikes, pit bikes, and vintage mini builds where factory fitment matters but modern reliability is the goal.

Key Features

• Same physical size as a stock CT70 engine
• Honda horizontal 2-bolt mounting pattern
• Larger valves for improved airflow and power
• Modern full-wave stator with lighting output
• Semi-automatic transmission (no clutch lever)
• 4 Speed
• Kick-start simplicity and reliability

Base Kit Includes

• Intake and Gaskets
  
• Sprocket Cover
• Breather Tube
  
• 420 15T Sprocket (17mm Shaft)
• Shifter Lever
• Kick Start Lever

Direct Bolt-In Fitment (Honda Horizontal Mount Pattern)

Fits frames originally equipped with Honda horizontal 50–70cc engines, including:

• Honda CT70
• Honda ST70 / DAX70
• Honda Z50
• Honda CRF50 / Honda XR50
• Honda ATC70
• Honda TRX70
• Honda CL70
• Honda SL70
• Honda XL70

Also compatible with many aftermarket pit bike and mini frames designed around the Honda horizontal engine pattern.