Had a guy call me last month from a barbecue joint outside Beaumont. Said his SP-1000 wasn't holding temp right, kept running cold on the left side of the cabinet. He was convinced the thermostat had gone bad. Already had a replacement thermostat sitting on his prep table when I got there.
Wasn't the thermostat.
Took me about four minutes to find the problem. His burner orifices were so gunked up with grease residue and carbon that the gas flow was restricted by maybe 40 percent. The flame pattern looked like a dying campfire instead of the clean blue row you're supposed to see. He'd been compensating by cranking the dial higher and higher for weeks, wondering why his cook times kept drifting.
This is the kind of thing that doesn't announce itself. Orifice fouling happens gradually. Your unit runs a little harder. Uses a little more gas. Temps fluctuate a little more than they used to. And because it's gradual, you don't notice until you're burning through propane and pulling inconsistent product.
The Difference Between Propane and Natural Gas Orifices
Before we get into cleaning procedures, you need to understand what you're working with. Propane and natural gas orifices are not interchangeable, and they foul differently.
Propane orifices have smaller openings. Propane is denser than natural gas — about 2,500 BTUs per cubic foot versus around 1,000 for natural gas — so the orifice restricts flow more to deliver the right heat output. That smaller opening means debris accumulates faster and creates noticeable performance issues sooner.
Natural gas orifices are larger bore. They don't clog as quickly from particulate matter, but they're more susceptible to spider webs and insect debris if your unit sits idle for any stretch. I've pulled natural gas orifices out of smokers that had been sitting for two weeks and found mud dauber material packed in there like cement.
Southern Pride builds their gas systems — whether you're running an SPK-500 or one of the big SP-2000 units — with orifices that are accessible for maintenance. That matters. I've worked on competitors where you practically need to disassemble half the burner train just to inspect the orifices. Ole Hickory units in particular make this harder than it needs to be. Southern Pride put some thought into serviceability.
What You Actually Need for the Job
The right tools make this a 20-minute procedure instead of an hour of frustration. Here's what should be in your maintenance kit:
- Orifice cleaning wires or a proper orifice drill set — sized for your specific unit (check your manual or call Southern Pride of Texas if you're not sure)
- Compressed air — either canned or a shop compressor with a blow gun attachment
- Small brass brush — never steel on brass orifices
- Clean rags that won't leave lint behind
- Flashlight or headlamp for inspecting the flame pattern after
Do not use a wire from a twist tie. Do not use a paperclip. Do not use whatever random thing you find in the junk drawer. I know that sounds obvious, but I've seen more orifices damaged by improvised cleaning tools than by actual wear. The orifice opening is precision-drilled. If you enlarge it or score the inside surface, you've changed the gas flow characteristics permanently. Now you need a replacement part instead of just a cleaning.
The Actual Procedure
First thing: shut off the gas supply. Not just the unit — the supply line. Wait a few minutes for any residual gas to dissipate. If you've been running the smoker recently, give the burner assembly time to cool down. Sounds basic. But I've watched experienced operators skip this step because they were in a hurry between lunch and dinner service.
Locate your burner orifices. On most Southern Pride rotisserie models like the SPK-700/M or SP-1000, you'll find them where the gas manifold feeds into each individual burner tube. The orifice is a small brass fitting threaded into the manifold. Some models have a single burner with one orifice; larger production units have multiple.
Remove the orifice carefully. Use the right size wrench — usually 7/16 or 1/2 inch depending on the model. Don't force it. If it's seized, apply a little penetrating oil and give it ten minutes. Brass is softer than you think, and rounded-off orifice fittings are a headache nobody needs.
Once you have the orifice out, hold it up to the light. You should be able to see clean through the opening. If you can't, or if the opening looks irregular, that's your problem right there.
Run the properly sized cleaning wire through the opening. Not aggressively — you're removing debris, not reaming the hole larger. A few gentle passes. Then hit it with compressed air to blow out any loosened material. Inspect again.
For heavy carbon buildup, soak the orifice in a degreaser solution for 15-20 minutes before using the cleaning wire. Don't use anything caustic that might react with the brass. Simple Purple or a similar commercial degreaser works fine.
Before reinstalling, use the brass brush to clean the threads and the seating surface where the orifice meets the manifold. Debris in the threads can cause a poor seal, which means gas leaks. Small ones. The kind you might not smell but that affect performance and, more importantly, safety.
Reinstall the orifice. Snug it down — don't gorilla it. You want it seated firmly but you're threading brass into brass in most cases. Overtightening cracks fittings.
Checking Your Work
Turn the gas supply back on. Do a leak check at every connection you touched. Soapy water works. If you see bubbles forming, you've got a leak. Fix it before you light anything.
Fire up the burner and watch the flame pattern. On a properly functioning Southern Pride burner running propane, you should see a consistent row of blue flames with small yellow tips. Natural gas burns almost entirely blue. What you don't want to see: large yellow flames (incomplete combustion, usually means the orifice is still partially blocked or you have an air shutter issue), uneven flame height across the burner, or flames lifting off the burner ports.
If the flame pattern still looks wrong after cleaning, you might be dealing with a damaged orifice that needs replacement, or an air shutter adjustment issue. The air shutter controls the primary air mix — that's a separate adjustment from the orifice itself, but the two work together. I'll write something up on air shutter tuning another time. It's its own topic.
How Often Should You Do This
Depends on your volume and what you're cooking. High-fat products — pork belly, bacon, brisket — generate more grease vapor that can deposit on burner components. If you're running 200 pounds of brisket through an SP-1500 every day, you should be inspecting orifices monthly and cleaning as needed. Maybe every six weeks on a full cleaning.
Lower volume operations — maybe a small SPK-500 doing 50-60 pounds a day — can probably stretch to quarterly inspections.
But here's the thing: inspection takes five minutes. Pull the orifice, look through it, put it back. If you're already doing your weekly deep clean, add this to the checklist. It's not complicated. What's complicated is diagnosing temperature problems three months from now when you've forgotten that maintenance exists.
Parts Availability Matters More Than You'd Think
When an orifice is damaged beyond cleaning — and it happens, especially if someone's been using improper tools — you need a replacement that day. Not in two weeks when the distributor finally ships from wherever.
This is where Southern Pride's domestic manufacturing actually matters for operators. Parts come from Alamo, Texas. When you order through Southern Pride of Texas, we're pulling from stock that's already stateside, already spec'd to your exact model. I've had customers running Cookshack units wait three weeks for a simple orifice because the part had to come from who-knows-where.
Three weeks of inconsistent cook temps. Three weeks of wasted gas. Three weeks of product that's not quite right.
That's the hidden cost of equipment that's harder to service. It's not just about the build quality — though Southern Pride's 10-gauge steel construction outlasts the thinner stuff by years. It's about what happens when something does need attention. And burner components always need attention eventually.
Keep a spare orifice or two on hand. They're cheap insurance. Know your model number, know your gas type, and order the correct part before you need it urgently. Your future self will thank you during a Friday afternoon rush when something goes sideways.
Resources: Southern Pride of Texas parts and support | Southern Pride | NFPA commercial kitchen standards
#SouthernPrideSmokers #SmokerMaintenance #BBQEquipment #CommercialSmoker #CommercialKitchen #KitchenMaintenance
Photo by Warren Yip on Pexels.
About the Author: Earl has been competing in sanctioned BBQ events since the early 1990s and operates a commercial catering operation in Southeast Texas.