Hi
ironmandreamer, and a warm welcome to the forum. It's always great to welcome another Scott Bonnar owner aboard as we all like to learn new things and tinker here.

Grumpy is quite correct here, we need plenty of pics showing both machines from different angles and particularly the cylinder reels and bottom (bedknife) blades and a couple with the side chain-case covers removed, showing the chains and sprockets particularly the sprockets where they are not covered by the chains.

Instructions for using our forum 'Inline Uploader' for uploading pics can be found
HERE You can upload around 8 pics per post...you may have to make a couple of posts to complete your upload.

When you say "an old mower that a mate gave me with a 3.5hp motor that was found to need a crack welded" do you mean that the
motor had a crack somewhere...or the crack was somewhere else on the machine....
Once again ironmandreamer,

to OutdoorKing.