Yamaha WR250F 2021 - Page 220

CAMSHAFT
5-20
b. With the tensioner rod fully wound and the
chain tensioner “UP” mark “a” facing up-
ward, install the gasket “1”, the timing
chain tensioner “2” and tighten the bolts
“3”.
c. Release the screwdriver, check that the
tensioner rod comes out smoothly, and
tighten the gasket “4” and the cap bolt “5”.
3. Turn:
• Crankshaft
Counterclockwise several turns.
4. Check:
• Top dead center (TDC) mark on the genera-
tor rotor
Align with the crankcase alignment mark.
• Camshaft match marks
Align with the cylinder head surface.
Out of alignment  Adjust.
5. Install:
• Timing chain guide (top side) “1”
• Cylinder head cover gasket “2”
• Cylinder head cover “3”
• Bolt (cylinder head cover) “4”
TIP
Before installation, apply the sealant to the cylin-
der head cover gasket.
6. Install:
• Cylinder head breather hose
• Spark plug
Bolt (timing chain tensioner)
10 N·m (1.0 kgf·m, 7.4 lb·ft)
Tensioner cap bolt
6 N·m (0.6 kgf·m, 4.4 lb·ft)
T
R
.
.
2
2
2
a
a
3
3
1
1
3
3
T
R
.
.
4
4
4
5
5
Bolt (cylinder head cover)
10 N·m (1.0 kgf·m, 7.4 lb·ft)
Yamaha bond No. 1215
90890-85505
Three bond No. 1215®
Spark plug
13 N·m (1.3 kgf·m, 9.6 lb·ft)
New
T
R
.
.
1
3
4
2
T
R
.
.