Kevin (2 broke 2 ride) inspired me with the return of the Mac carburetor off his 440 so I did a little fooling around, removed the large welch plug, cleaned the screen underneath, replaced the metering needle, and it seems to work well on one of my 440 saws. I could never get this one to run right before with the Mac that was on it so in essence he has given me another saw...
It would not oil at all however, so I decided to look into that today. I did not take any photos, but the issues were the same as the 1st 440 that I worked on with the manual oiler piston being stuck, and the check valve in the automatic pumps stuck. In addition, the oil tank had a terrible layer of sludge on the bottom, no way it was ever going to work. I removed the front wrap handle, then removed the oil tank (only 4 bolts for the tank). The gasket was damaged removing the tank but no problem there, just get a new one from the attic. I had to take the automatic pump apart about a dozen times and ended up replacing the check ball, again no issue since I have a supply of 3/32" balls on hand. Put it back together and with a little priming through the plug over the pick up tube we had chain oiler action again. It was a shame to have to dig into this one as it was in very good condition and had never been worked on before. Even the paint is in very good condition. If memory serves me, I got this one from Wigglesworth when I attended the WKY GTG a few years back.
I did make one mistake (that I'll talk about...), when testing the oiler after putting it back together I started by pumping the wrong button. I didn't understand why I wasn't getting any bar oil when I saw and smelled the fuel mix coming from the muffler...
I will try to put this one in some wood next week and see if it is really ready to go.
The power head is certainly heavy enough to hold up a long bar like that...I only have a 24" on this one but that is about all I would care to lug about anyway.
Mark