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N 4.5
851098/1098S - M.Y. 2007 - edition 00
Engine
Valve seat
Visually inspect the valve seats: for cracking or pitting.
Minor damage can be repaired by grinding with special 45° and 60° single-blade grinders. Grind the valves and check the seal.
If the valve seats are excessively damaged, fit oversize seats. Replacement seats are available with 0.03 and 0.06 mm oversized
outside diameters.
Important
When you change the valve seats, change the valve guides as well.
Proceed as follows:
Remove the worn seats, grinding carefully to avoid any damage to cylinder head bores.
Check the diameter of head bores and choose the oversized valve seat that will give an interference fit of 0.04 to 0.10 mm.
60 45
24±0.02 16±0.02
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