Hi seanstuch, I have done a little researching on the Rover 14" Thoroughbred for you and what I have found is not encouraging...Rover stopped manufacturing the Thoroughbred after the acquisition of Scott Bonnar and concentrated their cylinder mower efforts on the Model 45 Scotty.
Consequently, no new parts are available; second hand parts are also very thin on the ground....The fact that no parts are interchangeable with the SB Model 45 further compounds the issue...
This makes your restoration a real challenge unless you can source the parts you need...
Could you please post some pics especially of the chain case (without the cover) so a we can get an idea of the sprockets general condition.

There is an Illustrated Parts List in the Scott Bonnar Parts Lists and Manuals for the Thoroughbred, you would need to subscribe to the manuals area to download it. Instructions how to access the Manuals area is in the second post in any topic on the main forum page...Click
HERE This may come in handy, if you decide to proceed. Hope this is of help,
