Before  start, I'm a red combine guy.  On our first date I took my (now) wife to look at  our new 750 MF combines on the dealer's lot.  In 1980 we traded for a 1480 and ran it 17 harvests before trading for a used 2166.  A few years ago we traded the 2166 for a 9660 STS.  I told my son in law he  was going to have to drive it, it was like changing religions for me.  I went to back it of the shed one time and had to get out the owner's manual to get the parking brake off.

To me we are losing way to much corn out the back.

Any suggestions on where to look or what to adjust?