A warm welcome to the ODK Forums, Widdo18.

To start with some basics, the manufacture dates of your engines are 9 April 1976 for the 45, and 20 June 1980 for the 430.
So they both have points ignition, and the correct Briggs repair manual for them is P/No CE8069. Illustrated parts lists and owner manuals are free downloads from http://bsintek.basco.com/MDEXResultsPages/default.aspx

That air cleaner element on the 45 isn't correctly installed - the outer lip of the foam is meant to extend over the top edge of the lower housing, to provide sealing. As shown here:
[Linked Image]

The Diplomat models are less than popular for a couple of reasons. One is that they are more awkward to work on than the 45's. But the major one is that they used a very failure-prone drive component from the factory - a nylon driven ring gear in the landroll. Some of these have been replaced by an aluminium gear that SB offered as a replacement, and if you're very lucky that machine will have one fitted.

Unfortunately, the upgraded part is no longer available now and hasn't been for quite some time..

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."