Checking The Tappet Covers; Checking The Camshaft Sprocket - Yamaha YFM400FAR Service Manual

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CYLINDER HEAD

Fasten a safety wire to the timing chain to

prevent it from falling into the crankcase.

When removing the camshaft sprocket, it is

not necessary to separate the timing chain.

Cylinder head

Loosen the 6 mm bolts first.

Working in a crisscross pattern, loosen each

10 mm bolt 1/4 of a turn. After all the bolts

are loosened, remove them.

CHECKING THE TAPPET COVERS

Tappet covers 1

Cracks/damage → Replace.

CHECKING THE TIMING CHAIN

One-way cam operation (tensioner)

Unsmooth operation → Replace.

Camshaft sprocket

Wear/damage → Replace the camshaft

sprocket and timing chain as a set.

a 1/4 of a tooth

1 Timing chain

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