Sachs Bikes MadAss Reparaturanleitung Seite 97

CYLINDER HEAD / VALVES
Install a new valve guide (oversize) from the top of the cylinder
head.
CAUTION
When installing a valve guide take care not to damage the
cylinder head.
After driving in the valve guide, ream it with a valve guide
reamer.
NOTE
Use cutting oil on the reamer during this Operation.
Always rotate the reamer clockwise, never counterclockwise.
Clean the cylinder head thoroughly to remove any metal
particles.
Reface the valve seat.
VALVE SEAT INSPECTION/REFACING
VALVE SEAT INSPECTION
Clean the intake and exhaust valves thoroughly to remove
carbon deposits.
Apply a light coating of Prussian Blue to the valve seats. Lap
the valves and seats using a rubber hose or other handlapping
tool. Remove the tool and inspect the width of each valve seat.
STANDARD: 1.0 mm
SERVICE LIMIT: 1.6 mm
If the valve seat is too wide, too narrow or has low spots, the
seat must be ground.
CAUTION
The valve cannot be ground. If a valve face is burned or
badly worn or it contacts the seat unevenly, replace the
valve.
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