Hipa Carburetor for Briggs & Stratton 20–25HP V-Twin Engines — Direct-Fit 407777 Kit with Filters & Gaskets

The Hipa 407777 carburetor kit is a direct-fit replacement designed to restore fuel delivery for Briggs & Stratton 20–25HP 4-cycle V-twin engines used in lawn tractors and riding mowers.

If your mower’s engine is running rough, hard to start, or lacks power, a worn or clogged carburetor is a common cause. This Hipa assembly is built to match common OEM part numbers (including 407777, 796227 and related listings) and arrives as a complete kit so you can swap the unit and several wear components in one repair session. Before installing, verify the solenoid valve location—this kit expects the valve on the left side for proper fitment.

Which engines and models will this Hipa carburetor fit?

This carburetor supports many 400000 and 440000 series Briggs & Stratton V-twin engines rated roughly 20–25 horsepower. It replaces multiple factory part numbers and works across several lawn tractor and mower applications from major OEMs.

• Compatible part numbers: 407777, 405777, 406777, 446677, 445577 and equivalent listings.
• Also suits 791230, 796227, 799230 and other related Inte k/John Deere applications.
• Fits models such as John Deere LA120/LA130/LA135, Sabre and Scotts lawn tractors and many YTH/GTH series mowers.

What’s included in the Hipa 407777 carburetor kit and why that matters?

The kit is supplied with the carburetor plus a selection of consumables so you can address common failure points during the install. Having replacement filters and spark plugs on hand reduces follow-up troubleshooting and helps ensure the engine runs cleanly after the swap.

• One Hipa 407777 carburetor unit engineered for direct replacement.
• Consumables: 499486S air filter, two spark plugs, two fuel filters and one pre-filter.
• Includes a rebuild kit so internal gaskets and seals are refreshed during installation.

How difficult is installation and what should I check before starting?

Installation is moderate for someone comfortable with small-engine maintenance; you’ll need basic hand tools and a few hours. Clean work area, fresh gaskets, and correct solenoid placement are important for a leak-free, reliable fit.

• Verify the solenoid valve is on the left side before attempting installation.
• Drain or clamp the fuel line and remove the air cleaner assembly to access the carburetor mounting bolts.
• Replace gaskets and reconnect linkages, then test for leaks and smooth idle after startup.

Will this part improve performance or solve every running issue?

A fresh carburetor can eliminate fuel-delivery problems caused by clogs, leaks, or worn internal parts, often restoring proper idle and throttle response. However, if ignition, compression, or fuel quality issues exist, those must be addressed separately.

• Resolves issues tied to worn or contaminated carburetor components.
• Does not replace diagnosis for ignition, valve, or fuel-pump faults.
• Recommended to use fresh gas and clean filters for best results.

Who this is for: The Hipa 407777 carburetor kit is aimed at homeowners, landscapers, and small-fleet technicians who maintain Briggs & Stratton 20–25HP V-twin mower engines and need a reliable, cost-effective replacement. It’s especially useful when you want a single shipment that includes the carburetor plus air and fuel filtration items and basic rebuild parts to complete a thorough service in one visit.