BioLion Carburetor Kit for 125–140cc 300E/450E/500E/550E Lawnmower Engines — Complete Repair Kit with Air Filter & Primer Bulb

The BioLion 799583 carburetor kit is a complete replacement assembly designed to restore fueling, starting, and acceleration for 125cc–140cc 300E/450E/500E/550E series lawnmower engines.

This all-in-one repair kit includes the replacement carburetor plus gaskets, clamps, fuel lines, air filter and cover, primer bulb, spark plug and mounting parts so you can swap a worn or damaged unit quickly without sourcing multiple pieces. It fits engines using part numbers like 08P502 and 09P602 and replaces several OEM references (599583, 595656, 590556, 591979, 593261 listed by common notation). The kit is intended to alleviate common symptoms such as fuel leakage, hard starting, poor throttle response and exhaust smoke by renewing the fuel delivery components.

How does this kit fix starting and running problems?

The carburetor is the component that meters air and fuel to the engine. Replacing a fouled or leaking carburetor and the associated seals restores correct fuel flow and mixture, improving spark plug combustion and throttle response.

• Comprehensive replacement carburetor calibrated for 125cc–140cc small engines
• Includes primer bulb to help quick cold starts
• New gaskets and fuel lines prevent leaks and air intrusion
• Spark plug included to ensure fresh ignition timing after installation

Which models and part numbers are compatible with this assembly?

This kit is built to fit 300E, 450E, 500E and 550E series small engines and is compatible with common OEM references for similar displacement units. Before ordering, match your engine’s model and stamped part number to ensure proper fitment.

• Fits 125cc and 140cc lawnmower engines in 300E/450E/500E/550E families
• Compatible replacements for 08P502, 09P602 and equivalent OEM numbers
• Replaces carburetor part numbers: 799583, 595656, 590556, 591979, 593261
• Included air filter replace# 799579 and cover replace# 595660 for matched service

What comes in the box and how does that save time?

The kit is packaged as a single service set so you don’t need to hunt down small parts during the repair. Everything required to complete a typical carburetor swap is included, cutting shop time and lowering the risk of missing critical pieces.

• 1 carburetor, 3 gaskets, 2 clamps and 2 fuel lines for proper sealing
• 1 air filter and cover matched to the carburetor inlet
• 1 primer bulb and 1 spark plug supplied for improved starting and ignition
• Hardware and fittings included for a one-stop replacement

Is installation difficult for someone doing yard equipment repairs?

Basic mechanical ability and a few hand tools are usually sufficient to install the kit. The parts are arranged for direct swap; removing the old carburetor, fitting new gaskets and connections, and adjusting the throttle linkages completes the job in most home-garage situations.

• Simple bolt-on installation with standard hand tools
• Replacing fuel lines and clamps minimizes future leaks
• Primer bulb and new spark plug reduce troubleshooting after install
• Contact BioLion support if you need fitment guidance or troubleshooting

Who is this for: This BioLion 799583 carburetor kit is aimed at homeowners, landscapers and small-engine technicians who need a dependable service replacement for 125cc–140cc 300E/450E/500E/550E series lawnmower engines. It’s ideal when the engine shows fuel-related symptoms or when preventative maintenance calls for renewing the carburetor and intake components in a single, cost-effective package.