BMW R45 R65 cylinder head overhaul valve shaft seals Twinshock and Monolevermodelle unleaded

Important: Please download the order form from the documents section here in the item description, fill it out, and include it with the cylinder head.

BMW 2-valve boxer cylinder heads – precision machining at the highest level

Our comprehensive overhaul for BMW 2-valve boxer cylinder heads combines state-of-the-art technology with decades of experience. Each head is thoroughly disassembled, industrially cleaned, and optionally ceramic blasted – for a clean, matte surface with high everyday suitability.

Old valve guides and seat rings are removed, and the base bores are precisely milled and honed. New components are inserted tension-free using thermal shrinkage. Final honing guarantees a perfect fit. The valve seats are machined on our SERDI 100 – based on 30 years of experience and specially developed contours. A vacuum test ensures that the valves are perfectly sealed.

After the new valves and springs have been installed, you will receive cylinder heads that are ready to be installed—ready for top performance and high mileage.

Scope of services per cylinder head:

• Disassembly, cleaning, visual inspection
• (Optional) Ceramic blasting
• Removal of valve guides and seat rings
• Milling and honing of the base bores
• Shrinking new guides and seat rings
• Honing valve guides to final dimensions
• Machining valve seats on SERDI 100
• Vacuum leak test
• Assembly of valves, spring retainers, valve springs

Parts package included in the price:

1 exhaust valve seat
2 valve guides
2 valves 8 mm shaft
2 valve springs

Note:

The planning of the sealing surfaces (cylinder and valve cover side) can be ordered additionally. We recommend machining both sides to avoid fitting problems due to warped surfaces.

Price is per cylinder head.