Rebuild the top end, after market reeds (for your average everyday rooting and tooting you don't have to but expensive ones), air cleaner, adjustable timming plate used after market pipe if it don't have one and if theirs money left port it.
I have a few questions about jack shafts for a project I'm thinking about doing?
Were do you get them?
Do they come with the bearings?
What holds them in place?
It happened to me I had one standard and one long rod . I didn't notice putting it together until I ran it. I couldn't get it to run right then I did a comp test when I took it apart it was pretty obvious.