BMW R75 R80 R90 R100 cylinder head overhaul Twinshock and Monolevermodelle unleaded rebuilding

Important: Please download the order form under Documents here in the item description, fill it out, include it with the cylinder head, and send it to our company address. 

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 finish that is highly suitable for everyday use.

Old valve guides and seat rings are removed, and base bores are precisely milled and honed. New components are installed stress-free using thermal shrinking. Final honing guarantees perfect fits. The valve seats are machined on our SERDI 100 – based on 30 years of experience and specially developed contours. A vacuum test ensures optimal valve sealing.

After installing the new valves and springs, you will receive ready-to-install cylinder heads back – prepared for peak 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 base bores

• Shrink-fitting of new guides and seat rings

• Honing valve guides to final dimension

• Machining valve seats on SERDI 100

• Vacuum leak test

• Assembly of valves, valve spring retainers, and valve springs

Parts package included in the price:

1 exhaust valve seat
2 valve guides
2 valves with 8mm stem
2 valve springs

Note:
Surfacing of the sealing faces (cylinder and valve cover side) can be ordered additionally. We recommend machining both sides to avoid fitment issues caused by warped surfaces.

Price applies per cylinder head.