Saving Old Seagulls

I actually live in Toowoomba, but am in Brissy a lot. I would love to know of a supplier/ seagull person in Bbne.
Hume

Progress Report:
I pulled the power unit off this morning, and the cylinder and crank seem pretty good, so I have left that intact. THe flywheel spins beuatifully, and there is no side to side play.
Instead, the gear box is decidedly crunchy!!
Pulled the gear box apart, and the pinion anad crown ...

I got given a Century Seagull recently. Initially, it ran OK, for ~ 15 mins. THen there was a bit of a clunk, and it started vibrating ++, and lost power. Any ideas as to what is going on inside. I wonder about bearings. THere is a bit of vertical play witht eh flywheel, (which I assume is normal ...

I pulled the flywheel off this afternoon; My intention is to chek the bearings (see other message: Vibrating and poor power).
I was in a hurry, as I had an assistant, and totally forgot to set the iston at Bottom Dead Centre. BOTHER!!
What damage could I have done, and how can I tell? What will I ...