593433 Carburetor For 699916 794294 Carb 21B000 Engine Motor Fit: Craftsman Lawn tractor Riding Mower

What It Is

This is an aftermarket carburetor designed to replace the OEM 593433, 699916, or 794294 units on Craftsman lawn tractors and riding mowers powered by the 21B000 engine series. It controls the air-fuel mixture entering the engine; if your mower stalls, won’t start, or runs rough, a clogged or failed carb is often the cause.

Fitment & Compatibility

Critical checks before buying:

• Engine model: Must be a 21B000 series engine (check the engine shroud or manual – it’s usually stamped on the valve cover or flywheel housing).
• OEM part numbers: Direct replacement for 593433, 699916, and 794294. If your original carb has a different number, it may not match.
• Deck size & mower model: Fits most Craftsman LT1000, LT1500, LT2000, and similar riding mowers with the 21B000 engine, but deck size (42”, 46”, etc.) isn’t a factor – engine series is what matters.
• Aftermarket vs OEM: This is a non-OEM part. Confirm the gasket kit and mounting bolt spacing match your original. Measure the carb flange hole center-to-center (typically about 2.75” apart) and the throat diameter (usually 0.75”).
• Fuel line connections: Check if your mower uses a pulse fuel pump or gravity feed; this carb works with both, but the pulse line port must be present on your engine.

Key Things to Know

• Installation difficulty: Moderate. You’ll need a socket set, needle-nose pliers, and possibly a small screwdriver. Expect 30–60 minutes if you’ve done it before, longer for first-timers.
• Quality notes: It’s a budget aftermarket carb. Reviews mention occasional casting flaws or gasket leaks – inspect the gasket surfaces and clean any debris before mounting. Some users report it runs slightly rich out of the box; an adjustable main jet is not included, so you may need to tweak the idle screw.
• Common gotcha: The included gaskets may be slightly thinner than OEM. Use a dab of gasket sealant on the intake manifold side to prevent vacuum leaks. Also, the fuel bowl drain screw is often plastic – don’t overtighten.
• What’s not included: Fuel line, air filter, or primer bulb. You’ll reuse your existing ones. Check the old fuel line for cracks; if it’s brittle, replace it.

Should You Buy It

This carb is a solid budget fix if your Craftsman riding mower with a 21B000 engine has a failing original carburetor and you’re comfortable with basic small-engine repair. It’s not a premium rebuild, but at $16.99 it’s often cheaper than a full OEM replacement and works well for most users. Skip it if you want a perfect OEM fit or if your mower has severe engine issues beyond fuel delivery.