6) Valve Springs - Rotax MMH-912 Series Maintenance Manual

3.11.6) Valve springs

Fig. 72-71
5
Effectivity 912/914 Series
Edition 1 / Rev. 0
BRP-Rotax
Maintenance Manual
See Figs. 72-71 and 72-72.
Carry out a visual inspection of the valve springs for damage and wear.
Depending on engine version, dual or single valve spring configurations
are planned. However, dual and single valve springs must not be used
on the same engine.
◆ NOTE: The valve springs can be distinguished by the different
wire thickness and the different spring strength.
The springs for inlet and outlet are equivalent and sym-
metrical.
Dual valve spring configuration:
– Inner valve spring (1)
– Outer valve spring (2)
Single valve spring configuration:
– Single valve spring (3)
3
07414
2.3 mm (0.09 in)
3.5 mm (0.14 in)
3.85 mm (0.15 in)
2
1
72-00-00
4
page 67
May 01/2007