Not knowing what it should be 100 psi sounds like it got plenty of compression ! My moneys on the chain saw mix oils that you use I would get some fresh gas and NEW 2cycle oil and mix it ! We used to do it in the 70`s when my Yammi 360 enduro`s injector pump went out and it worked fine !! although 32:1 seen kinda rich !! I use to run my 88LT250R at 50:1 JMO