Yamaha 2012 Grizzly 300 Service Manual page 140

VALVES AND VALVE SPRINGS
9.Measure:
• valve spring free length
Out of specification
10.Measure:
• compressed spring force
Out of specification
11.Measure:
• spring tilt
Out of specification
EBS00241
INSTALLING THE VALVES AND VALVE
SPRINGS
1. Apply:
• molybdenum disulfide oil
(onto the valve stem and valve stem seal)
2. Install:
• valve spring seats
• valve stem seals
• valves
• valve springs
• valve spring retainers
TIP
Install the valve springs with the larger pitch
facing upwards.
Smaller pitch
4- 20
ENG
→
Replace.
Valve spring free length
Inner spring
38.700 mm (1.5236 in)
<limit>: 35.200 mm (1.3858 in)
Outer spring
40.400 mm (1.5906 in)
<limit>: 36.900 mm (1.4528 in)
→
Replace.
Installed length
Compressed spring force
Inner spring
41.49 ~57.19 N
(4.23 ~ 5.83 kg, 9.32 ~ 12.85 lb)
Outer spring
73.97 ~ 103.40 N
(7.54 ~ 10.54 kg, 16.63 ~
23.243 lb)
→
Replace.
Spring tilt limit
Inner
2.5°/1.60 mm(2.5°/0.063 in)
New