Jon,
The Rotax installation manual for 912ULS states on p.42: "All ball joints
have to be greased regularly with heat resistant lubricant (e.g. LOCTITE
ANTISEIZE) to avoid gripping and seizing the joints."
I think you can use any recognized copper based exhaust system grease
available at auto supply stores.
Whether such lubricant also has a sealing effect over time is doubtful. If
you have any seizure marks due to stuck joints, some exhaust gas may escape
along these marks.
On the cylinder joints, have you checked that the nuts are torque correctly?
I had a problem with nuts coming loose, but have now safety wired the nuts.
Regards,
Svein
LN-SKJ
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