Rotax 912 Series Service Manual

BRP-Rotax
Maintenance Manual
Effectivity 912/914 Series
Edition 1 / Rev. 0
72-00-00
page 67
May 01/2007
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3.11.6) Valve springs
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) 2.3 mm (0.09 in)
– Outer valve spring (2) 3.5 mm (0.14 in)
Single valve spring configuration:
– Single valve spring (3) 3.85 mm (0.15 in)
07414
Fig. 72-71
4
3
5
1
2

Rotax 912 Series Specifications

General

Redline	5800 rpm
TBO	2000 hours
Displacement	1211 cc
Bore	79.5 mm
Stroke	61 mm
Power Output	80 hp (59.6 kW)
Compression Ratio	9.0:1
Fuel Type	Avgas 100LL
Ignition System	Dual electronic ignition
Fuel System	Fuel Injected
Oil System	Dry sump
Engine Type	4-cylinder, horizontally opposed, 4-stroke