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Working on a customers saw and one problem is is puts out an awful lot of oil on the chain. Too much!
Is there any way to slow that down? I don’t see an adjuster, anything that can be done to help that problem?
Thanks

No
You can change the oil pump
Are you sure the pump is pumping too much or is the oil leaking from the pump ?

I would try a thicker oil first as parts are very difficult to find for those.