Tom,

The engine nos on mine are:
The younger red one: 7030
The older burgandy one: 9706

So they make no sense!  2000 apart and only 500 or so tractors made. And the lower serial number on the younger tractor.  The serial number plates are just as inaccessible as the carburettors - if I recall they are to the right of the carbs and part hidden.

Haven't looked at the gears and don't want to!!!! - as long as things are OK - they move OK without any growling or other suspicious noises.

Have you got the original magnetos for yours?

I eventually want to get ours off those awful cut down tractor tyres and onto angle iron strakes as they should be - but I have to confess that they are easier to move on the rubbers!

John