Chainsaw Repair

1manband, very nice project. I always wanted to restore one of these old girls. Almost had one once like brand new.
Like Roy said the Canadian National Railway used to use them.  I had a tree removal customer about 10 years ago who worked for the railway and he took ownership of one that only ran a tank of fuel through it. The painted letters on the bar weren't even scratched.
Well about 5 years later when I learned the history on these saws I called the fellow up and asked him if he still wanted to sell it. Well he had a sad reply, he said it was collecting dust for too long in his shop so he threw it out in the garbage dump

Anyways here's some history on the saw. I even got a copy of a parts manual for it

The 650 was introduced in 1964 and discontinued in 1976. There was also the 750 and 850.
The design of these saws started way back in 1956 with the IEL/Pioneer RA model as my other pics show.

Now check out the very last pic of the Stihl Contra/Lightening introduced in 1959.
Check out the Stihl's design similarities to the 1956-57 Pioneer RA.
Looks to me the Stihl 090 was a IEL/Pioneer imitation.