Chainsaw Repair

I was given this toy the other week, a local saw from a local log cutter / weekend pub racer.
(late 60's early 70's I believe) It was used (i'm told) for work duties mostly but ,from time to time was run behind local hotels for some social racing.
The prizes were big bottles of beer and bragging rights in the hotel.
Wood chopping and cross cut sawing were also done on the same after noon.

This example of coarse a Solo Rex, but i'm told it has the larger cylinder giving it 140 odd cc's and he called it a super rex.
Took 15 minutes to get going and run's surprisingly good, it has 1/2 inch chain on it.

edit,,, forgot to mention, this mongrel likes to snap back, caught me a few times now.