699831 Carburetor Tune Up Kit for Briggs & Stratton for 694941 28D702 28D707 28M707 28R707 283702 283707 284702 284707 284777 286702 286707 289702 289707 Lawn Tractor Mower Engines

What It Is

The 699831 Carburetor Tune Up Kit is an aftermarket rebuild set designed for Briggs & Stratton single-cylinder OHV engines commonly found on lawn tractors and zero-turn mowers. It includes gaskets, seals, a replacement carburetor bowl, and a fuel inlet needle—enough parts to restore fuel metering and stop leaks in engines that are hard-starting, surging, or leaking fuel.

Fitment & Compatibility

This kit replaces OEM part 694941 and fits the following Briggs & Stratton engine models: 28D702, 28D707, 28M707, 28R707, 283702, 283707, 284702, 284707, 284777, 286702, 286707, 289702, 289707. Before buying, check your engine’s model number—it’s stamped into the blower housing or valve cover (not the mower deck). The kit will not work on engines with a different carburetor flange pattern or fuel bowl design. Measure the bowl gasket diameter (roughly 2.5 inches) to confirm it matches your existing carb. This is an aftermarket part; it may have slightly thinner gaskets than OEM, but fitment is generally reliable.

Key Things to Know

• Installation difficulty: Moderate. You’ll need a small flathead screwdriver, a socket for the bowl nut, and patience to clean the carb body. Expect 20–40 minutes.
• Common gotcha: The kit includes a new bowl but not a new float or float pin. If your float is stuck or cracked, you’ll need to buy that separately.
• Quality: Gaskets are adequate but not as pliable as OEM—use a thin film of fuel-resistant grease to help them seal. Some users report the bowl nut can be slightly oversized; test fit before tightening.
• Tune-up tip: Replace the air filter and spark plug at the same time for best results. A dirty filter will ruin the new carb tune quickly.

Should You Buy It

Buy this kit if you have one of the listed Briggs & Stratton engines and your mower is hard to start, runs rough, or leaks fuel from the carburetor—and you’re comfortable with basic small-engine repair. At $10.88, it’s a cheap fix compared to a full carburetor assembly, but it’s not a permanent solution for heavily worn engines; if the carb body is corroded or the throttle shaft is loose, replace the whole carb instead.