Hipa Carburetor for Briggs & Stratton 20–25HP V-Twin Engines — Model 407777 Kit with Filters & Rebuild Parts

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

If your mower is running rough, stalling, or using more gas than usual, the carburetor is a common cause. This Hipa kit targets the Briggs & Stratton series and related John Deere models that use the 400000 and 440000 engine families. It ships as a comprehensive kit that includes the carburetor plus filters, spark plugs, and a rebuild set so you can install or service the part immediately.

What engines and models will this carburetor fit?

This Hipa 407777 carburetor is compatible with many Briggs & Stratton 20–25HP V-twin 4-cycle engines and a range of lawn tractor models from multiple brands. Confirm part numbers and solenoid orientation before purchase to ensure correct fitment.

• Compatible part numbers: 407777, 405777, 406777, 446677, 445577, 40G777, 796227, 791230 and related variants.
• Fits engines in the 400000 & 440000 series and Intek V-Twin 20–25HP ranges.
• Common equipment: John Deere LA120/LA130/LA135 models and many Scotts, SABRE, Cub Cadet, and other lawn tractors.

How easy is it to install the Hipa 407777 carburetor?

The replacement process is straightforward for someone comfortable with small-engine maintenance. The kit contains the primary replacement carburetor plus filters and a rebuild kit, which simplifies installation and reduces downtime.

• Includes one carburetor, air filter (499486S), two spark plugs, two fuel filters, one pre-filter, and one rebuild kit.
• Check that the solenoid valve sits on the left side before tightening; some models vary.
• Basic hand tools and a few hours are typically all that's needed for removal and installation.

What performance and maintenance benefits can I expect?

Replacing a worn or clogged carburetor often brings back smoother starts, steadier idle, and improved throttle response. The included rebuild parts and filters help extend service intervals once installed correctly.

• Restores proper fuel/air mix for steadier idle and acceleration.
• New filters included reduce contaminants reaching the carburetor and engine.
• Rebuild kit enables future service without buying a separate overhaul set.

Are there special checks or warnings before purchase?

To avoid fitment issues, compare your existing carburetor part number and verify the solenoid location. This carburetor matches many common part numbers, but small variations in throttle linkage or mounting hardware can occur between models.

• Confirm current carburetor part number matches one of the listed compatible numbers.
• Ensure the solenoid valve orientation is correct for your engine (left-side expected).
• Consult your mower’s service manual for torque specs and linkages if unsure.

Who is this for: The Hipa 407777 carburetor kit is aimed at homeowners, landscapers, and small-engine mechanics who need a reliable replacement for Briggs & Stratton 20–25HP V-twin lawn tractor engines. It suits anyone who wants a complete swap-and-service package—carburetor plus filters, spark plugs, and rebuild parts—to restore engine performance without sourcing multiple components separately.