390323 Carburetor Kit Compatible for Briggs & Stratton 7 8 9 HP 170412 190432 190400 190412 194412 194415 195423 195431 195432 Horizontal Engine Lawn Mower, Replace 398170 394228 299169 Part

What It Is

This carburetor kit replaces the fuel metering system on Briggs & Stratton 7–9 HP horizontal-shaft engines commonly found in walk-behind mowers, tillers, and generators. It includes the carburetor body, gaskets, and hardware to restore proper fuel flow when the original clogs or fails.

Fitment & Compatibility

Before buying, confirm your engine model number (stamped on the blower housing or valve cover) matches one of these: 170412, 190432, 190400, 190412, 194412, 194415, 195423, 195431, or 195432. This kit replaces OEM part numbers 398170, 394228, and 299169. It is an aftermarket part, not genuine Briggs & Stratton, so verify the mounting pattern (two-bolt flange, 3.5-inch center-to-center) and that your engine uses a horizontal shaft (shaft points sideways, not down). It will not fit vertical-shaft engines or larger displacement models above 10 HP. Measure the carburetor throat diameter—this kit is designed for 0.75-inch or 1.0-inch bores.

Key Things to Know

• Quality: At $23.99, this is a budget aftermarket option. Expect plastic parts that may be less durable than OEM metal components; inspect the float and needle for burrs before installation.
• Installation difficulty: Moderate. You’ll need to remove the air filter, fuel line, and two mounting bolts, then transfer your old throttle linkage and governor spring to the new carb. A small screwdriver and pliers are sufficient.
• Common gotchas: The included gaskets may be too thick or thin—compare with your old ones. If the engine surges after install, adjust the idle mixture screw (usually 1.5 turns out from lightly seated). Also, check that the fuel line fits snugly; aftermarket carb inlets can be slightly smaller than OEM.
• No tuning instructions: The kit lacks detailed setup specs; you’ll need a shop manual or YouTube video for proper float height (typically 1/4 inch) and governor adjustment.

Should You Buy It

Buy this if you need a quick, low-cost fix for a 7–9 HP Briggs horizontal engine that won’t start or runs poorly due to a gummed-up carburetor, and you’re comfortable with basic small-engine repair. Skip it if you want OEM durability, have a vertical-shaft engine, or need a perfect fit without tinkering—in those cases, spend more on a genuine Briggs & Stratton carburetor.