'74-'75 Honda CR125M hi-performance top end: hi-flow ported cylinder, high-compression head w/leak-free gasket setup, custom intake & exhaust manifolds, 0.25mm OS piston / rings / bearing / pin / circlips with < 10 hrs use, and intake / exhaust / head / base gaskets. Bore is excellent, dust specks appear in some photos.

Intake manifold: 36.0mm ID, 41.0mm OD     Exhaust manifold: 38.5mm ID, 42.5mm OD