been busy with work so the mower again has taken a back seat, but the latest is that the rings are worn, blows plenty of smoke and the carby was past being repaired apparently.
So in the shop they got a spare carby on it and got it running to discover the smoke... for now just going to get it going and will keep the oil topped up and look out for a new (well 2nd hand) motor to put on it.
there's a 12.5 HP B&S on ebay that is local but it's now gone up to $445 and not sure if it's still worth it. A new one is around $800 apparently and at least then I know there will be no problems with it!
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=330429164121&ssPageName=STRK:MEWAX:IT the rest of the mower is pretty good and for the terrain I am using it on it's probably the best one for it, solid axle, plenty of steel etc... a lot of these new mowers all have diffs and all the body work seems to be plastic...
Nathan