The Miller Bobcat 250 is the most refined gas engine-driven welder in its class. The stick arc is smoother than any comparably priced Lincoln. The EFI option eliminates the carburetor headaches that plague engine-driven welders during storage. Auto-Speed engine management reduces fuel consumption and noise between welds. And the 11,000W generator output is clean enough to power sensitive electronics.
The trade-off is price and power. At $5,000-$6,000, the Bobcat 250 costs $500-$1,500 more than the Lincoln Ranger 250 GXT and $500 more than the Ranger 305G, which delivers 55 more amps. The Bobcat wins on arc refinement and fuel efficiency. The Lincoln wins on raw power and value. The right choice depends on which matters more for your work.
Who This Machine Is For
- Farm and ranch owners who want the best arc quality for diverse repair and fabrication work
- Maintenance professionals who value smooth welding and clean generator power for tools
- Mobile welders building a rig around a premium power source
- Contractors who need reliable welding and job site power from a single machine
- Users who store their machine for extended periods (EFI model avoids carburetor issues)
Specifications
| Specification | Detail |
|---|---|
| Welding Output (CC) | 20-250A |
| Welding Output (CV) | 14-26V |
| Duty Cycle | 100% @ 200A, 50% @ 250A |
| Open Circuit Voltage | 75V |
| Stick Rod Capacity | Up to 5/32" (7018, 6010) |
| MIG Wire Capacity | .024-.045 (with wire feeder) |
| Generator Peak | 11,000 watts |
| Generator Continuous | 9,500 watts |
| Engine | Kohler CH740 (725cc, carb or EFI) |
| Fuel Type | Regular unleaded gasoline |
| Fuel Tank | 12 gallons |
| Fuel Consumption | ~0.9-1.4 GPH (welding load) |
| Starting | Electric start (recoil backup) |
| Outlets | 2x 120V GFCI duplex, 1x 120/240V twist-lock |
| Weight | 505 lbs (wet) |
| Dimensions | 43" L x 21" W x 30" H |
| Warranty | 3 years |
Arc Quality: The Bobcat Advantage
The Bobcat 250’s stick arc is noticeably smoother than the Lincoln Ranger at equivalent amperages. Miller’s inverter-aided generator design (Excel power) produces a more refined welding output with less AC ripple on the DC output.
7018 performance: This is where the Bobcat shines brightest. The 7018 arc is quiet, stable, and produces excellent puddle fluidity. Slag releases cleanly. Spatter is minimal. The bead appearance on 7018 fill and cap passes is as good as it gets from an engine-driven machine.
6010 performance: Good but not exceptional. Lincoln’s Ranger line has better 6010 characteristics, which isn’t surprising given Lincoln’s pipeline focus. The Bobcat runs 6010 capably, but the dig isn’t as crisp and the freeze isn’t as fast as the Lincoln. For occasional 6010 use, the Bobcat is fine. For daily 6010 work, the Lincoln is the better choice.
7024 drag rods: Excellent performance. The smooth arc and stable voltage make high-deposition drag rods run at their best. Flat-position filling is fast and clean.
6013 and light-duty rods: Very smooth at low amperages. The Bobcat is forgiving of travel speed and arc length variations, making it easy to use for less experienced operators.
EFI Option: Worth the Upgrade
The Bobcat 250 with EFI (Electronic Fuel Injection) costs $500-$800 more than the carburetor model. For machines that see regular use, EFI is worth every dollar. For machines that sit for months between uses, EFI is critical.
Benefits of EFI:
- No carburetor. No jets to clog, no float to stick, no varnish buildup during storage. EFI fuel injection is sealed and doesn’t interact with fuel during storage.
- Better fuel efficiency. EFI optimizes the fuel-air mixture in real-time, burning 10-20% less fuel than a carburetor at equivalent power output.
- Easier starting. EFI calculates the correct fuel delivery for cold and hot starts automatically. No choke adjustment needed.
- Altitude compensation. EFI adjusts fuel delivery automatically at altitude, maintaining power output. Carburetors run rich at altitude without manual jetting changes.
- Emission compliance. EFI meets stricter emission standards without sacrificing performance.
The storage problem with carburetors: Engine-driven welders that sit for 30-60+ days between uses develop carburetor problems. Ethanol in gasoline attracts moisture and creates varnish that clogs jets and passages. EFI eliminates this failure mode entirely. For farm machines that might sit all summer between fence-building and harvest repairs, EFI prevents the “won’t start when you need it” problem.
Auto-Speed Engine Management
Auto-Speed is Miller’s idle-down feature that reduces engine RPM and fuel consumption when you’re not actively welding. When you stop the arc, the engine RPM drops to idle. When you strike an arc, the engine ramps up to welding speed.
The transition is smooth and takes about 1-2 seconds. During that ramp-up, the welding output may be slightly reduced, but it’s fast enough that most welders don’t notice a difference in arc quality.
Auto-Speed reduces fuel consumption by 20-40% over a typical work day where actual welding time is 30-50% of run time. On a $5/gallon gasoline day, that’s $2-$5 per shift in savings. Over a year of regular use, Auto-Speed pays for the machine’s overhead.
Noise is also reduced during idle-down. The engine at idle is significantly quieter than at full RPM, making the breaks between welds more pleasant.
Excel Power Generator
The Bobcat 250’s Excel power generator produces cleaner AC output than standard brush-type generators. The inverter-aided circuit reduces voltage fluctuations and harmonic distortion, producing power that’s closer to utility-grade.
This clean power matters for:
- Sensitive electronics. Laptops, phone chargers, and LED lights run without flickering or damage.
- Variable-speed power tools. Angle grinders and drills with electronic speed control work properly.
- Plasma cutters. Running a small plasma cutter on the Bobcat’s generator output works better than on standard generator outputs.
The 11,000W peak / 9,500W continuous output matches the Lincoln Ranger 250 GXT and provides enough power for a full field tool complement: grinder, lights, drill, and a small compressor.
Build Quality
The Bobcat 250 is built to Miller’s industrial standard. The steel frame is welded and powder-coated. The control panel is organized clearly with the welding controls on one side and generator outlets on the other.
The lifting eye is centered for balanced crane lifts. Skid mount holes match standard truck-bed and trailer mounting patterns. The fuel tank filler is accessible without tools.
The panel-mounted controls include:
- Process selector (CC/CV)
- Amperage/voltage fine-adjustment dial
- Range selector
- Arc force (dig) control
- GFCI test/reset buttons
- Hour meter
The hour meter is a useful feature for tracking maintenance intervals and machine usage.
Compared to the Competition
vs. Lincoln Ranger 305G ($4,500-$5,500)
The core comparison in this class. The Lincoln delivers 305A (55 more than the Bobcat), runs 3/16 inch rod, and costs slightly less. The Bobcat has a smoother arc, optional EFI, Auto-Speed, and Excel power.
Buy the Lincoln if: You need 3/16 inch rod capability, prioritize 6010 performance, or want more welding power per dollar.
Buy the Miller if: You prioritize arc quality on 7018, want EFI reliability, and value fuel efficiency.
vs. Lincoln Ranger 250 GXT ($4,000-$5,000)
The Ranger 250 GXT matches the Bobcat’s 250A output at $1,000 less. Generator output is identical at 11,000W. The Lincoln weighs slightly less (490 lbs vs. 505 lbs). The Bobcat’s arc is smoother and the EFI option is unavailable on the Ranger.
For pure value, the Lincoln wins. For arc refinement and EFI, the Miller wins.
vs. Miller Trailblazer 325 ($7,000-$9,000)
The Trailblazer adds 75A (325A total), higher generator output (12,000W), and advanced features like pulse MIG capability. The price premium of $2,000-$3,000 buys genuine performance upgrades. For users who need more than 250A or the Trailblazer’s advanced features, the upgrade is justified. For general 250A work, the Bobcat is sufficient.
Who Should Buy the Bobcat 250
Buy it if arc quality on 7018 and general-purpose rods matters to your work. If you do diverse welding (not just pipeline 6010), the Bobcat’s smooth, forgiving arc makes every rod type easier to run. The EFI option eliminates a major reliability concern for machines with irregular use patterns.
Who Should Skip It
- Pipeline welders who run 6010 primarily. The Lincoln Ranger 305G’s 6010 arc and higher amperage are better matched.
- Budget-conscious buyers who don’t value the arc quality premium. The Lincoln Ranger 250 GXT delivers equivalent welding at $1,000 less.
- Heavy stick welders who need 3/16 inch rod capability. The Bobcat’s 250A limit restricts large electrode use.
Final Verdict
The Miller Bobcat 250 is the most refined gas engine-driven welder in the 250A class. The arc quality on 7018 and general-purpose rods is the best you’ll find without stepping up to the Trailblazer. The EFI option solves the storage and starting reliability problems that frustrate engine-driven welder owners. Auto-Speed and Excel power add real-world benefits in fuel savings and power quality.
The price premium over the Lincoln Ranger line is justified for users who value the smoother arc and EFI reliability. For users who prioritize raw amperage and value, Lincoln’s Ranger line delivers more welding power per dollar.
Prices and availability subject to change. Prices listed reflect typical street prices at time of writing.