A JE Pistons single piston for the Honda CRF450, listed with a 13.5:1 compression specification and supplied as one replacement piston. The overview describes its use in engine rebuilds or maintenance on CRF450 bikes, noting the compression figure where provided and avoiding any unsupported technical extrapolation beyond fitment and purpose.
JE Pistons Honda CRF450 13.5 to 1 Piston Single