Jabiru 120hp 6 cylinder

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A friend of mine has the new Jabiru 6 cylinder engine in his home built
with ~100 hours on it. He says that every 25 hrs, he has to adjust the
valves. At his 100 hour, he has to do a differential pressure test.
After helping him with his pressure test, we noticed that #6 was out of
spec for losing pressure. It turns out that the fix for the pressure
issue was to tighten the head bolts on #6.

Is this a normal amount of maintenance for a jibaru? Am I the only one
who thinks this is a bit too much effort for maintaining an aircraft engine?

Evan
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