I have 48 " 6 burner stove natural gas.Stove is

Yes you will need to change them. The flame will be large and eratic if not changed.

Although the natural gas orifices for the stove top burners were replaceable with propane orifices, many ovens/broilers orifices are simply adjustable using a 1/2" open end wrench to convert from one gas to another. Some brands are adjustable and some have to be changed out. It depends on the make and model. Do you have your owner's manual? It contains detailed info on converting your unit. I included a link below to choose from the list to download your manual. You'll need your exact model # listed on your stove. Pull out the bottom drawer and look at the data plate for the model # and then find it on the list for the correct manual. Douglas

http://shared.whirlpoolcorp.com/product_literature/search_results.jsp?searchTerm=KGST307&siteCd=WHRCOM&userType=Consumer

First check the book to see if you have a igniter on this stove if so it takes a moment or two to get started, if not you need to light pilot
make sure gas is getting to burner when called for by the thermostat or oven control..

Silver solder up all burner jets and redrill to .6 mm then reset adjusters so you get a nice blue flame with small orange tips.and oven burner to .8mm i have just done a new world 75 last week.Works perfect

the fuel to air mixture is set incorrectlty or your pressure at the ouitlet for the gas valve is too low.
you culd play around adjusting the first part of this but for the gas valve part you have to have a manaometer to check it out correctly. then it should be set at 10"wc. Good Luck

 mine was humidifier, orange flame is minerals in the water.

Call Dynasty / Jade ph# 800-884-5233

i would check the wiring tothe gas valve, sounds as if you wired incorrectly

If your top burners are not lighting or will not work, it is possible that the burners have become dirty or wet. Please follow the troubleshooting directions below before calling service:

1. Turn you burner to the Lite position:
   
   If you hear clicking or sparking, go to Step 2.
   
   If you do not, check your circuit breakers. If the circuit breaker is ok, we recommend that you schedule service by calling 1-800-432-2737 or schedule service online.
   
   
2. Clean the burner and electrode:
   
   First remove the burner grate, cap, and head. Use a needle or paper clip to poke through the holes on the burner head. Re-assemble and try the burner.
   
   Remove the burner grate, cap, and head. Even if it looks clean, wipe the tip of the electrode with a clean, dry paper towel and PRESS IT DOWN. Re-assemble and try the burner, again.
   
   Check to see if the burner works, If not, then go to Step 3.
   
   
3. Re-assemble - Make sure that each burner top matches its burner bottom. The burner top will lay flat if put on correctly.
   
   Check to see if the burner works, If not, then go to Step 4.
   
   
4. The spark igniter is operating properly, but the burner is still not lighting. At this point, we would recommend that you schedule service by calling 1-800-432-2737 or schedule service online.
   

no gas flow sounds like a bad gas regulato on the stove. as for the 5 year old ge profile with ignitors not working, you need a part called a spark modual