Interesting comment about the MS290. I have one as well and I see nothing on the underside that would increase or decrease oil delivery.
No there not.Like I said, you need to pull the clutch drum and check the drive tang. Stihl's are noted for tang failure.
I ran for about 45 minutes of cutting and didn’t hear anything when I opened the cap. The pump is def doing something. So I am gonna drain the tank and flush it with some gas and then add a 1/2 tank of lube and run it and take it somewhere quiet to open it up.Have you tested the vent yet?
You need air to enter the oil reservoir as oil and air leave the reservoir. Basic fluid dynamics.
Definitely sucks air when I open the cap. I Put in a couple of cups of fuel and spews out to start and creates a vacuum. Where is the vent?No there not.
The first step with oil issues is always the vent. Start with the vent.
Use diesel instead of gas...I ran for about 45 minutes of cutting and didn’t hear anything when I opened the cap. The pump is def doing something. So I am gonna drain the tank and flush it with some gas and then add a 1/2 tank of lube and run it and take it somewhere quiet to open it up.
Start at page 60...The vent is right by the chain adjuster.Definitely sucks air when I open the cap. I Put in a couple of cups of fuel and spews out to start and creates a vacuum. Where is the vent?