Carburetor Repair Kit MIA11779 for John Deere L118 L120 LA120 LA135 LA145 LA155 Z225 Z235 Z245 Z425

Carburetor Repair Kit MIA11779 for John Deere L118 L120 LA120 LA135 LA145 LA155 Z225 Z235 Z245 Z425

This carburetor is engineered as a direct replacement for the John Deere L118 L120 LA120 LA135 LA145 LA155 Z225 Z235 Z245 Z425. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.

Vehicle Compatibility

Replaces OEM Part Numbers

MIA11779 • Briggs • Stratton • Engine • 31P707 • 31P777 • 405577 • 406577 • 406777 • 407777 • 407777-0290-G5 • 40H777

Signs You Need a Replacement

If your equipment is showing any of these symptoms, the carburetor may be the cause:

• Engine floods easily — The float valve isn’t seating properly, allowing fuel to overflow into the bore. The engine loads up with fuel and won’t start until it clears.
• Lean surging at cruise speed — A blocked main jet or partially clogged passage causes the engine to run lean under steady throttle. It surges as the mixture alternates between lean and rich.
• Black smoke and rich smell — Too much fuel relative to air. Check the choke mechanism, float level, and jet sizes if the carburetor has been modified.
• Fuel dripping from the carburetor — A worn needle and seat or stuck float allows fuel to overflow. This is a fire hazard and should be fixed immediately.
• Hard starting when cold — The choke circuit may be blocked or the enrichment valve stuck. Cold-start problems on a carbureted engine almost always trace back to the choke.
• Inconsistent idle speed — The idle mixture screws may need adjustment, or there’s a vacuum leak at the carburetor base gasket.

Rebuild Tips

Before installing the new carburetor, clean the manifold surface and check the gasket for any damage or vacuum leaks. Set the idle mixture screws to the baseline position (typically 1.5 turns out from fully seated) before starting. After starting, warm the engine to operating temperature, then fine-tune the mixture screws for the highest smooth idle. Adjust the idle speed screw last. If the engine backfires through the carburetor, check the valve adjustment and ignition timing.

Frequently Asked Questions

Will this fit my John Deere L118?
Yes. This part is designed to fit the John Deere L118, L120, LA120, LA135 among other models listed in the compatibility table above. Verify your specific model and engine code before ordering to ensure the correct fit.

Can I cross-reference MIA11779 with Briggs?
Yes. Both MIA11779 and Briggs are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.

How do I check if my engine code (LA120, LA135, LA145, LA155) matches?
The engine code is stamped on a metal tag attached to the engine block, usually near the timing belt cover or on the cylinder head. Compare the code you find with the list above. Engine codes are 3 to 6 characters long.

My vehicle is a 7777 model – is it covered?
The compatibility range for this part includes 7777-0290. The 7777 model year falls within this range, but verify the engine code and body type match. Mid-year production changes sometimes mean two vehicles from the same model year use different parts.

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