594207 Carburetor Carb Kit 597126 Replacement For Briggs & Stratton Intek Engine Mower Tractor Carb 40N777 40N877

What It Is

This is a complete carburetor assembly (part #594207) and gasket kit (part #597126) designed to replace the factory carb on Briggs & Stratton Intek single-cylinder engines, most commonly found on riding lawn tractors and zero-turn mowers from MTD, Cub Cadet, Troy-Bilt, and similar brands.

Fitment & Compatibility

Before buying, confirm your engine’s model number (e.g., 40N777, 40N877) – this kit fits those two families only. Check the stamped numbers on the engine shroud (not the mower deck). This is an aftermarket part, not OEM Briggs. Measure the carb mounting flange bolt spacing: it should be 2.5 inches center-to-center. Also verify your intake manifold gasket matches the included gasket shape – some Intek variants use a different port pattern. If your engine has a plastic fuel bowl or a different primer bulb location, this kit may not align.

Key Things to Know

• Quality is inconsistent – several reviews note rough casting, sticky float needles, or gaskets that don’t seal perfectly. Expect to clean or adjust before it runs right.
• Installation is moderate difficulty: you’ll need to remove the air filter housing, fuel lines, and throttle/governor linkage. Take photos of linkage positions before disassembly.
• The included gaskets are thin – many users recommend buying a separate OEM gasket set for a better seal.
• This kit does NOT include a fuel solenoid or anti-backfire valve – if your original carb had one, you’ll need to swap it over or buy separately.

Should You Buy It

Buy this only if you’re on a tight budget and comfortable with carburetor tuning – it can work, but expect to tinker. For a reliable fix, save up for an OEM Briggs carb or a higher-rated aftermarket kit with better reviews. If you just need a quick patch to finish mowing season, this might get you through.