Irv, Several customers in this area have run oats with a machine that have all of our threshing and seperations tricks. In your modifications,have you done all the upgrades ie;wires removed from concave,rear of concave lowered(no wedge),double stacked helicals on thresher side,seperation grate left of concave,channel helical bars on seperator side of cage,shrunken rotor with hi-lo cylinder bar configuration,four paddles on the end of the rotor,F2 toothed cncave bars on the seperator grate. If all of these have been done you should stilll have no problem threshing oats. If the oats are ripe,they are usually pretty easy to thresh. Start with a 1_2"-5_8" concave setting and open up to 3_4" if you can maitain a good thresh. You may have to install one or two filler bars depending on how much wet material there is in a windrow.With a hypered machine,rotor speed should be 400-600rpm.Chaffer setting of 5_8"-3_4",seive setting of 3_8",and fan choke of 5-7 depending on shoe load. The straw coming from this machine should look like it has been run through a crimper. Remember though,if you are running windrows,they will tend to dry the stems and will cause more break-up of the straw. Cutting standing oats leaves the straw more intact. Hope this helps,let us know if it don't. Hyper Harvest II