I get the thing on the deck being horizontal, but the tyres are probably the same extra height in profile both front and back over what should be on it. Which is the right thing to do. Or an axle has been moved.
The mudguards have possibly been modified to provide tyre clearance.
I checked out the parts list for the yellow machine, its got fairly reasonable black and white pictures (photocopy of a photo) in it. The red one is no better than line drawings of parts.
The correct tyre sizes in the parts list are Front 350-6 rear 400-8. The tyres are real skinny, check the pics in the other thread. But they might be the same effective diameter still.
The inner and outer on the original front wheel rims are the same part.
Theres two different part numbers for the rear rims, One has the hub in it, other is rim, pic is not that good but it looks like the dish of the halves is about the same.
Look like you have two different back rims, left looks like a two piece and right looks like one.
The front rims look like a deeper outer than the inner.
They look like later wheels to me.
Those brackets on the back on the deck sure look like they are cast. The anti scalping wheels should be a 5" wheel. White nylon centre and a black rubber tread, looks like a pretty cheap part, like you would get in the wheels and castors section of a chain hardware store, same as what is on the later deck with the bolt on brackets (by that i mean theres nothing cast there, the rear of the deck is a smooth radius on the later models). Im tipping its got what its got because the tyres are too fat to take the 5" wheel. IE; dished in too far.
The difference may be with the rear axle too. I dont see anything mentioned about the axle mounting any different so its probably nothing. 25 inch is a 7/8 axle and the 28 inch is a one inch axle.
It is a RH deck, The LH decks have the belt come over the top of the spindle shaft then a 180 deg turn then around the spindle pulley. That reverses rotation.
Theres a couple of threads on the LH decks on here, have a look. I had to ask as it had me miffed too.
All in all I think that machine you have there is a great find.
Think of it as a hot rodded 70's car.
I would advise not to go pulling it apart unless you know you have in your hands the parts to put it all back to right. I dont even think that the parts would be that hard to find. To ship 4 wheels and other bits from Aus to the UK could be the deal killer. I imagine it would be a very unique machine in the UK.
You should be able to find a G65 locally. I did speak to Deutcher about a drive pulley to put a briggs on a slasher that a G65 came on originally and the guy mentioned that the parts were different. Not sure exactly how but on that machine you have the briggs crank might be a different diameter than a honda.
Can i plead, when you pull the clutch appart on the front of the motor can you please please please take heaps of photos and measurements galore for me.
That is one part that I am missing that I could possibly have to get made.
Heres something intersting. just looking at the parts page for the above clutch setup (its the worst pic of the lot), in the description it says;
Modification Rear idler pulley automatic belt adjustment introduced 6.9.73 Frame No 3191284
So it would appear there should be a frame number.
Cheers, Bob.