Ok, I am confident that the starter o-ring is alright, I will test run it later on, if revs are still high, I will recheck it.
I had one of these that a guy was totally fed up with, he took it to the mower shop and it still played up.
When it came to me, it had troubles starting, wouldnt run right.
I replaced the o-ring, ran it, then it started playing up.
So I stripped starter off, o-ring was missing and chewed up inside the case.
What I found was the 3 bolt that hold the starter and seal the case, must have been loose at some point and flogged out the groove where the o-ring sits.
So when I replaced it again, I used gasket goo, let it set.
Ran it the next day and all was fine.
