594605 17.5 HP Carburetor for 287707 28N707 799727 28N777 28U707 28Q777 14hp 15hp 16hp 17hp 18hp Engine for Craftsman LT1000 LT2000 LT3000 with Drain Valve 5401

What It Is

This is an aftermarket carburetor designed to replace the OEM unit on many Craftsman lawn tractors (LT1000, LT2000, LT3000 series) with 14hp to 18hp single-cylinder engines, including models like 287707, 28N707, 799727, 28N777, 28U707, and 28Q777. It includes a built-in drain valve (part #5401) for easy fuel draining during storage or maintenance.

Fitment & Compatibility

Before buying, confirm your engine’s model number (stamped on the valve cover or blower housing) matches one of the listed numbers: 287707, 28N707, 799727, 28N777, 28U707, or 28Q777. This carb fits 14hp, 15hp, 16hp, 17hp, and 18hp Craftsman engines, but not all 17.5hp engines—check the specific engine model, not just the tractor model. Measure the mounting bolt spacing (typically 2.5 inches center-to-center) and the throat diameter (usually 1 inch) to ensure it matches your intake and air filter housing. This is an aftermarket part, so it may differ slightly from OEM in finish or gasket thickness.

Key Things to Know

• Quality varies: At $22, this is a budget carb. Expect some plastic components (e.g., float bowl) that may crack or warp over time. Inspect for debris or rough casting before installation.
• Installation is moderate: You’ll need a socket set and possibly a new gasket (often included). Clean the intake port and old gasket residue thoroughly. Reuse your original choke linkage and governor spring—these are not always compatible with the aftermarket parts.
• Drain valve is a plus: The built-in drain valve makes winterizing easier, but check it seals tightly to avoid leaks. Some users report it dripping if not fully closed.
• Tuning required: After installation, you may need to adjust the idle and main mixture screws (typically 1.5 turns out from seated) for smooth operation. Expect to tweak it after a few hours of run time.

Should You Buy It

If you have a common Craftsman 14-18hp engine with one of the listed model numbers and you’re comfortable with basic carburetor tuning, this is a cost-effective fix for a clogged or worn original. It’s not for a pro needing OEM durability, but for the price, it often gets a non-running mower back to work with minimal hassle.