Carburetor 594207 593197 for BS 40N777 40N877 Intek Engine Mower Tractor Carb

What It Is

This aftermarket carburetor (cross-referenced as OEM 594207 or 593197) replaces the factory carb on Briggs & Stratton Intek engines, specifically models 40N777 and 40N877. It’s designed for riding mowers and tractors using those engines, controlling the air-fuel mix for combustion.

Fitment & Compatibility

Before buying, confirm your engine model number (e.g., 40N777-0123-E1) – it’s stamped on the valve cover or blower housing. This carb fits Briggs Intek single-cylinder engines with a 40 cubic inch displacement (approx. 656cc). It does not fit V-twin Inteks or older Quantum/Industrial engines. Check that your mower uses a side-draft carb with a plastic float bowl and electric solenoid (most 40N777/40N877 do). Measure mounting bolt spacing: it should be 2.5 inches center-to-center. If your original has a different fuel line diameter (often 1/4-inch), you may need an adapter.

Key Things to Know

• Quality varies – This aftermarket unit may have slightly thinner gaskets or a less precise idle mixture screw than OEM. Reuse your old gaskets if the new ones leak.
• Installation is moderate – You’ll need basic tools (socket set, screwdriver) and about 45 minutes. Watch for the small spring under the throttle plate; it’s easy to lose.
• Common gotcha – The fuel shut-off solenoid often fails on these carbs. If the engine won’t start after install, check that the solenoid’s plunger moves freely and that 12V reaches it with the key on.
• Tuning needed – Expect to adjust the idle speed screw (usually 1.5-2 turns out) and possibly the main jet. Running too lean can cause surging or backfiring.

Should You Buy It

This is a budget-friendly fix if you’re comfortable with minor carb tuning and your OEM carb is beyond cleaning (e.g., warped body, stripped threads). It’s not for beginners or those wanting a drop-in replacement – expect to tweak settings. For $38, it’s a decent stopgap, but if you want zero hassle, spend $60-80 on a genuine Briggs carb.