Duke convection oven adjustment for more air to burner

Adjust the air mixture on the oven burner. This is a metal part where the brass orifice is mounted on the burner valve. You loosten the screw on the side of it enough to be able to slide it back and forth. Get a flame going and move the barrel until the tips of the flame in the burner is completely blue...no part of the flame should be orange. Once that is done tighten the screw . automotive brake fluid is an excellent soot cleaner. It smells bad so use it with a lot of ventilation.

Do the rangetop burners act OK, Brenda? It's just the oven that's causing a problem?

Go back to the oven burner, right where you installed the new orifice. That orifice should fit inside an air mixture tube, probably stainless steel, leading to the burner itself. Right where the orifice fits into it will be some means of adjusting the air mixture - a sliding window of some sort, whether flat or round. You'll need to loosen the screw holding it in place (DO NOT remove the screw, only loosen it) and turn it so the air opening is larger. Right now you're getting too "rich" a mixture, too much propane & not enough air. Before you close it all up, try the oven again - see if your adjustment worked correctly. If not, adjust it again - this is a trial-and-error process, and it's different for every different altitude and climate.

At some setting, you'll get a nice blue flame with very little orange in it. If you live in a very high humidity area, you'll have much more orange color than people who live where it's very dry, but the flame should at least be MOSTLY blue, and should never be sooty.

The oven flame needs to be adjusted so more air will mix with the gas. This is unsafe since the amount of carbon monoxide is greater under the circumstances.

If you are getting soot residue, it could be a number of things, First, is this a natural gas or propane oven? If you bought an oven to be used for propane, it may need to be converted from natural gas to propane or it will soot everything up. 2nd, have you recently spilled food/liquid onto the oven burner? If the burner holes are partially plugged, the remaining holes will burn large yellow flames and soot up the oven. Check the burner flames, they should be mostly blue with little to no yellow tips. Also make sure the oven burner flames are not too big. They should never exceed the width of the flame spreader pan directly above the burner, in fact they should be less than half the width. You could also have other issues like improper air shutter adjustment to the oven burner or very low regulator pressure, but most likely it has just been spilled on recently.

It shouldn't be burning yellow and emitting soot at all;sounds like on of these possible causes-
(a)blocked burner airways(this can lead to yellow tipping and sooting on LPG powered appliances because insufficient air is getting through to the burner causing it;you can also get this effect on LPG barbecues say if dead insects or spiderwebs are in the burner pipes and airways after a period of storage),
(b)incorrect aeration being set when the burner was converted using LPG jets(too much gas and not enough air causing yellow flames/smells and sooting),
or (c) if you use propane cylinder gas a dicky or faulty regulator. I would get it looked at investigating all the possibilities I mention and taking action to correct this where necessary ie clearing the burner airways(if this is causing your problem), adjusting the aeration in the burners until you get a clear noiseless blue flame without any excessive yellow and sooting(but even after good adjustment you may find still get a very slight yellow tip without sooting at the top of the flame;this does happen with propane gas and there is a slight tendancy for this to happen more often with butane-butane tends to display very slight yellow tips on ignition increasing slightly as the burner warms up to full temperature) or if you use propane cylinder gas replacing the regulator if that is necessary.

clean the orfices and tubes and then if possible adjust your air mixture setting also

This is a definate sign of improper gas/air mixture. The flame needs to be even and blue.
Make sure the orifice is clean. Usually the burner (oven) will have a "Door" or "Shutter" type adjustment where you can turn it and add or choke off air. This is the primary air supply. The secondary air supply is usually supplied by louvers or vents close to the burner area.

The vent (shutter) allowing air to mix with the gas has shut. Access the burner with the oven off, of course, and look for the shutter (a sliding 'door'). It usually has one screw holding it n place and an elongated slot to permit adjustment. It may also turn. Since your burner is producing soot, you need to open the shutter more. Loosen the screw and slide the shutter open more. Turn the oven on and look for a nice blue flame, and one that doesn't run too far over the burner. Keeping in mind that everything there will be hot when the burner is on, and also for a long time after it is off, you can use a long-bladed screwdriver to push the shutter back and forth to get the flame you are looking for. If the screw is loose, a gentle tap will be enough. When you are see that optimum blue flame and you are satisfied, let the oven cool off for an hour or so, and final tighten the screw--making sure you haven't moved the shutter much when tightening. If this doesn't work you have a bigger problem and need to call a service person. Your local gas company sometimes will direct you to a person.

yes i can help locate the pressure regulater where the gas line hooks up there will be a square lookin nut on top of it unscrew it and in side will be an insert and a spring one side of the insert will have nat thats for natural gas flip it over and the other will say lp then screw the nut back down should be fine o tay lol

If you oven temp is off by +- 50 degrees, thermostat needed to be change. to check and adjust the oven thermostat usually we place the oven thermometer in the center of the oven, run the oven at 350 degrees for minimum 30 minutes and check the oven temperature, It should be +- 25 degrees, if it needed adjusting, there is the adjusting slot screw in the center of the thermostat stem, to adjusting it ( do not turn thermostat stem during adjusting ), turn adjusting screw counter clockwise to raise the the temp, clockwise to lower the temp, turn it a little at a time and wait 15-30 minutes before do the next adjustment until the temp match with the oven knob. To adjust the oven burner air and gas mixture, first turn the air shutter close, you will see yellow flame, then open the shutter until the yellow flame disappear and them open it a little more, now you are done. For the oven uneven cooking? you may have a bad oven burner tube, during operation some of the flame may be lift off, disappear or flame being uneven, you can check it with the kick panels off to see the flame, if these are the case, you needed to change the oven burner tube,