I have a Stihl MS290.
Last year I stuck my good bar in a tree. I used the old bar / chain to get it back out.
The old bar / chain was cutting pretty good and I just left it on the saw.
Yesterday it started to cut poorly and it shouldn't have (chain was just sharpened....) I finished with another saw and today I tore it down to clean it and check it out.
There was some sawdust / dirt in the oiler channel and evidence that the oil had been going elsewhere.
Cleaned everything up and put the newer bar back on the saw along with a new chain.
When I started the saw to run in the chain I wasn't getting any oil off of the chain, but it was dripping out from under the saw.
The bar, including the hole for the oil is clean. I doubled checked and the hole in the bar is lining up properly. I ran the saw without the bar and the oil is coming out from the right spot.
I flipped the bar over and tried it again and the same result.
This bar has been used on this saw and it has worked fine. So, what am I screwing up?