Sym MB10A7-A series Service Manual page 114

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Rotate the valve seat cutter clockwise and
counterclockwise with 4 to 5 kg pressure in
order to fix the uneven part.
Caution
Apply motor oil to the contact face while
grinding it.
Use the 45 degree valve seat cutter to remove
any roughness on the valve seat.
Caution
Reface the valve seat with 45 degree
valve seat cutter after removing the valve
guide.
Use the 32 degree cutter to remove the upper
1/4 part of the valve seat.
Use the 60 degree cutter to remove the
bottom 1/4 part of the seat and check the new
valve seat.
To this chapter contents
7. Cylinder Head / Valve
Rotate clockwise / counterclockwise
Roughness
45°
Old valve seat width
Old valve seat width
4~5kg
32°
60°
7-13