Checking The Camshafts - Yamaha FJR13AEV(C) Service Manual

EAS23850

CHECKING THE CAMSHAFTS

1. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches → Re-
place the camshaft.
2. Measure:
• Camshaft lobe dimensions "a" and "b"
Out of specification → Replace the camshaft.
Camshaft lobe dimensions
Intake A
33.050–33.150 mm (1.3012–
1.3051 in)
Limit
32.050 mm (1.2618 in)
Intake B
24.997–25.097 mm (0.9841–
0.9881 in)
Limit
23.997 mm (0.9448 in)
Exhaust A
33.050–33.150 mm (1.3012–
1.3051 in)
Limit
32.950 mm (1.2972 in)
Exhaust B
24.997–25.097 mm (0.9841–
0.9881 in)
Limit
24.897 mm (0.9802 in)
3. Measure:
• Camshaft runout
Out of specification → Replace.
Camshaft runout limit
0.030 mm (0.0012 in)
4. Measure:
• Camshaft-journal-to-camshaft-cap clearance
Out of specification → Measure the camshaft
journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
0.028–0.062 mm (0.0011–0.0024
in)
M MMM M MMM M M MMM M
a. Install the camshaft into the cylinder head
(without the dowel pins and camshaft caps).
b. Position a strip of Plastigauge
camshaft journal as shown.
c. Install the dowel pins and camshaft caps.
5-15
CAMSHAFTS
M MMM M M MMM M M MMM M MMM
®
"1" onto the