bgm PRO MRB cylinder head for pistons with 70-71 mm diameter. The head is CNC milled in Germany from the solid. The surface of the cooling fins is significantly increased compared to the Italian, Indian, Spanish and most other heads. This leads to a significantly higher heat dissipation and amit better cooling.
The head is designed to be warp resistant with an extra large sealing surface to the cylinder.
The compression ratio is 9.25:1 or 9.50:1 depending on the stroke, ideal for all road engines.