Miles SinclairBy Miles Sinclair

Updated November 2026

The Yoder YS640S pellet grill is a heavy-duty, insulated cooker built for steady low-and-slow smoking and high-heat searing. This guide walks you through unboxing, the first burn-in, temperature calibration, and a practical first cook so you finish with a grill that runs predictably. Most of the steps below apply to any pellet grill, but the details reflect the YS640S’s larger cook chamber and controller.

Prepare the Yoder YS640S Before the First Fire

Set the grill on a level, non-combustible surface with at least several feet of clearance from walls, overhangs and fences. Confirm the hopper, drip tray and grease bucket are seated correctly. Check that the temperature probe is routed away from grates and that the cooking grates are clean of packing residue.

Shopping for one? See our guide: Pellet Grill vs Electric Smoker (2026): Which Is Better for Smoking?.

Plug the grill into a dedicated outlet, not a shared extension cord. The auger and fan draw steady current, and a weak connection causes feed interruptions mid-cook.

Run a Proper Burn-In Cycle

A burn-in removes manufacturing oils and cures the paint and firebox. Fill the hopper with quality hardwood pellets, set the controller to 350°F, and let the grill run with the lid closed for 30 to 45 minutes. Expect some smoke and a mild factory odor; this is normal. Yoder’s own guidance focuses on ventilation rather than a specific number, so keep the area open and the lid shut only during this cycle.

After the burn-in, let the grill cool completely, then empty the firepot and check that pellets are feeding evenly.

Calibrate Temperature and Learn Your Pellet Behavior

Pellet grills run within a range, and the displayed temperature is only as accurate as the probe position. Place a separate reliable thermometer at grate level near the middle of the chamber, then compare readings at 225°F, 275°F and 325°F. Note any consistent offset and keep it in mind rather than chasing the display.

  1. Set the grill to 225°F and wait 20 minutes for stabilization.
  2. Compare the grate thermometer to the controller reading and record the difference.
  3. Repeat at 275°F and 325°F to see whether the offset shrinks or grows.
  4. Use the lower grate for thin cuts and the upper grate for larger, slower items if your readings show hot or cool zones.

Some owners report that the chamber runs slightly cooler near the door on windy days, so reposition meat or shield the grill when weather changes.

Run a Simple First Cook

Start with something forgiving, such as pork shoulder or whole chicken thighs, so you can judge smoke, bark and timing without a lot of risk. Set the grill to 250°F, add a light coat of oil and rub, and cook until the internal temperature reaches the target for the cut. For chicken, the USDA specifies 165°F in the thickest part; for pork shoulder, many pitmasters pull around 195 to 205°F for shreddable texture. Use a leave-in probe and verify it against an instant-read thermometer.

Once your first cook is done, record the pellet brand, setting, weather and total time. Those notes are the fastest way to dial in future cooks.

Tools and Supplies Checklist

  • Hardwood pellets suited to smoking (oak, hickory, or a blend)
  • Instant-read thermometer for verification
  • Grate-level backup thermometer for calibration
  • Heat-resistant gloves and a long-handled brush
  • Foil pans and a meat-safe cutting board
  • Notebook or phone notes for logging cooks

Common Mistakes

  • Skipping the burn-in, which can leave off-flavors on early cooks.
  • Trusting the controller display without checking grate-level temperature.
  • Letting the hopper run low mid-cook, which can cause temperature swings.
  • Opening the lid frequently, which drops chamber temperature and extends cook time.
  • Storing pellets in damp conditions, which affects burn quality and feed.
  • Dual-probe digital thermometer: Lets you track meat and chamber temperature at the same time. View on Amazon
  • Hardwood smoking pellets: A consistent fuel source keeps flavor and feed steady across cooks. View on Amazon
  • Grill cover: Protects the cabinet and controller from rain and UV between cooks. View on Amazon

For more on the broader category, see Pit Boss Pellet Grill: A Step-by-Step Guide for First-Time Owners and Pit Boss Pellet Grill Temperature Probe: Accurate Readings Guide, which cover probe placement and controller habits that apply to most pellet cookers. If you are still comparing options, Pellet Smoker vs Pellet Grill: Is There a Real Difference? explains how the two categories overlap.

FAQ

How long should I run the Yoder YS640S burn-in?

A burn-in of 30 to 45 minutes at 350°F is a common starting point. Keep the lid closed and the area ventilated while it runs.

Why does my Yoder YS640S read a different temperature than my thermometer?

The controller probe sits in one spot, so readings near the grate or door can differ. Compare against a grate-level thermometer and note the offset for future cooks.

Is it safe to leave the grill unattended during a long smoke?

Monitor the hopper level and temperature regularly, especially in wind or rain. For questions about electrical or fire safety, consult the manufacturer’s manual or a qualified technician.

Conclusion

A careful setup, a complete burn-in and a quick calibration check will make your Yoder YS640S far more predictable from the first cook onward. Start with a forgiving cut, log your results, and adjust from there. Consistent notes are what turn a good grill into a reliable one.

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Miles Sinclair

About Miles Sinclair

Miles Sinclair is part of our editorial team and reviews and edits our BBQ & grilling guides, checking product details against manufacturer specifications and owner feedback.