THE JENN AIR BOTTOM BURNER IN THE GAS OVEN IS BURNING YELLOW

You have to be careful when adjusting the flame because you can cause carbon monoxide issues. There are two adjustments. the orifice hood and the air shutter. the orifice hood when turned will adjust the flame amount and the air shutter will adjust the burning of the gas. the hood will be on the line feeding the burner usually on them safety valve and should be a 1/2 inch nut. The air shutter is the door like opening on the burner tube itself. Your flame should be a nice blue cone without any yellow and should not blow and walk off the burner.

Something spilled into the area where the flame is Those big gaps in the bottom plate is how the heat gets into the oven from the burner . Try letting the oven burn off whatever spilled in it

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.

This is cars and trucks but i will endevour to give some sort of answer ,the flame being to high could be caused by a faulty regulator if used from a gas bottle or again the regulator on the gas meter if mains gas ,alternativly the jet that feed the burner has a enlarged hole in the part that you can see with the flames ,well at the bottom of that a jet that injects the gas into the burner which also has air holes in the bottom to mix the gas so look at the burner first and see what you can see in the way of any air holes being blocked with dried fat

Normally not the thermostat. Blue flames signify that the gas is burning clean, a yellow flame signify that some contaminate is burning with the gas. I would guess that something has leaked onto the burner or you have some corrosion build up. Try taking it out and giving it a good cleaning with a soft bristled brush and see if that is any better.

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.

Can I assume that you determined that the bottom burner flame is burning properly? To do this, remove the oven bottom insert. The flames should have approximately 1" of blue cone and should burn with no yellowing tip, if on natural gas. (A small yellow tip on the end of the outer cone is normal with most LP gas.) The flmaes should not lift off the burner ports. If the flame is lifting, gradually reduce the air shutter until the flame stabilizes.

Go to the following website for your particular manual.

http://www.hammerwall.com/Manuals/Kenmore/Description/362.75585890/Kenmore%20Free%20Standing%20Gas%20Range%20Owners%20Manual/L0522834/

This sounds like a weak igniter, it would have to be a gas oven and the symptoms usually are: takes longer than normal to ignite the burner, may or may not smell gas in the oven, does not maintain set temperature or burner does not come on fully, eventually won't heat at all. On gas ovens, a glo igniter is like a light bulb, the more you cook, the faster it wears out. Bottom line, needs to be replaced. Good luck. 

If the burner bar has an adjustable slider for increasing or decreasing air into the bar.That would be it. If not then there is a defect with the gas valve or burner bar.

I think ill give it a try for you. The gas lines come in thru you cutoff valve then thru you gas valve and on to the burner. right before the burner you will see a bell shape fitting. The gas line is in the center of the fitting and there will be some opening around this fitting That fitting has dust clogging it up. This is where the gas mixes with the air Turn your oven off and blow this fitting out.