Sachs Bikes MadAss Reparaturanleitung Seite 99

CYLINDER HEAD / VALVES
VALVE SEAT GRINDING
A Valve Seat Cutters, a grinder or equivalent valve seat refacing
equipment are recommended to correct a worn valve seat.
NOTE
Follow the refacer manufacturers operating instructions.
Use a 45 degree cutter to remove any roughness or irregular-
ities from the seat.
NOTE
Reface the valve seat with a 45 degree cutter when a valve
guide is replaced.
Using 32 degree cutter, remove 1 /4 of the existing valve seat
material.
Using 60 degree cutter, remove the bottom 1/4 of the old
seat. Remove the cutter and inspect the area you have just
removed.
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