Valve System

Valve System

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Important: The exhaust valves are stellite-coated and should therefore not be machined. Grinding with paste only is advised. Valves in the B235R and B205 R/L have nimonic valves manufactured of a high-temperature resistant material.

Valve Guides

Length 42.5 mm
Outside Diameter 12.039-12.050 mm
Bore for Valve Guides, Diameter 12.000-12.018 mm
Maximum Clearance, Valve Guide* 0.50 mm
*measured across the valve disc with the valve drawn out 3 mm from the valve seat

Valve Springs





Fitted
B205 37.5 mm

Free
B205 57.1-60.1 mm

When Loaded 361-403 N (81-91 lbf)*
B205 31.7 mm
*Twin Coil Springs incl. Valve Disc and Valve Stem Seal

Tappets

Diameter 32.959-32.975 mm
Height 24.0 mm
Bore for Tappets, Diameter 33.000-33.016 mm