SYOWADA Carburetor Replacement for BS 14.5Hp 15Hp 16Hp 17Hp 18.5Hp 19.5Hp 20Hp 21Hp Intek Engine Motors, 697122 Carb Replacement For B&S 31A507 31A607 31A707 31A777 Engines

What It Is

This is an aftermarket carburetor designed to replace the factory-installed carb on Briggs & Stratton Intek single-cylinder engines ranging from 14.5 to 21 horsepower. It’s meant for riding mowers, zero-turns, and tractors that use the 31A-series engine models (e.g., 31A507, 31A607, 31A707, 31A777). It replaces OEM part number 697122 and restores fuel delivery when the original carb clogs, leaks, or fails.

Fitment & Compatibility

Check your engine model number – not just horsepower or deck size. The SYOWADA fits Briggs & Stratton Intek engines with the 31A prefix (31A507, 31A607, 31A707, 31A777). Look for a stamped code on the engine shroud or valve cover (e.g., “Model 31A707”).
OEM cross-reference: Replaces B&S part 697122, 697122R, 693327, and 691246.
Not for: Vanguard, OHV, or older flathead engines. Also incompatible with engines that use a different carb mounting pattern (e.g., 28A-series).
Measurements: The carb has a 1-inch bore and a standard flange bolt pattern (2.25-inch center-to-center). If your fuel line is 1/4-inch ID, it should fit; if your line is 3/16-inch, you may need an adapter.
What to verify: Your engine must have a plastic or metal intake manifold with a single mounting gasket – this carb uses a flat gasket, not an O-ring.

Key Things to Know

• Quality & tuning: It’s a budget aftermarket carb. You may need to adjust the idle mixture screw (usually 1.5 turns out as a baseline) and check the float height (should be parallel to the bowl gasket surface).
• Installation difficulty: Moderate – expect to remove the old carb, clean the intake manifold, and transfer the throttle/choke linkage from your original carb. The plastic linkage arms on the SYOWADA can be fragile; reuse your metal parts if possible.
• Common gotchas: The included gaskets are thin and may leak – apply a thin film of oil or gasket sealant. Fuel line may be a snug fit; use a small hose clamp. The carb may run rich out of the box – expect some black smoke until adjusted.
• Warranty: SYOWADA offers a 30-day return window, but no long-term guarantee. Test fitment before installing fully.

Should You Buy It

If you have a 31A-series Briggs Intek engine and need a quick, low-cost fix for a clogged or failed carb, this is a solid budget option. It’s not for high-performance use or long-term reliability – expect to replace it in 1-2 seasons if you run ethanol fuel. Best for DIYers who can handle minor tuning and don’t want to spend $60+ on an OEM carb.