Hi Beammeup,
Welcome aboard!
That Scotty looks like she should come up quite nicely, I'm glad to see a few older Scotty's building up recently on the forum, as it's where I'm planning to take the reel-mower side of my collection, particularly the model 45's like yours.
I can think of a few issues that might cause the problems you are describing, but I'm not an expert on Scotty's or Briggs (I'm learning though) we have some people here very knowledgeable on your engine, and others who are very passionate about the Scotty's, so I'm sure you will find all the help you need.
Might I suggest you pop a thread in the repairs and maintenance section, to help get the ball rolling faster on your issue.
Again welcome, and Good luck with the repairs!
