BioLion D110 Carburetor Replacement Kit for John Deere D100/D105/D110 & 42" Mowers — Includes 796031 Air Filter & 492932S Oil Filt

BioLion D110 carburetor replacement kit restores proper fuel flow and includes matching air and oil filters for John Deere D100-series and many 42" riding mowers.

If your mower is running rough, stalling, or using excess fuel, a worn or clogged carburetor often causes those symptoms. This BioLion kit supplies a direct-fit D110-style carburetor plus a high-flow air filter (796031) and oil filter (492932S) to help return engines to smoother starts and steadier idling. The parts are designed to match OEM mounting and throttle linkages for a straightforward swap on a broad range of tractors and riding mowers.

Which machines will this D110 carburetor kit fit?

This replacement is compatible with multiple John Deere D100-series models (D100, D105, D110) and LA-series lawn tractors, plus several 42" riding models from Troy-Bilt, Bronco and Craftsman. It supports engines in the 15–21 hp range and fits numerous Nikki engine codes listed by manufacturers.

• John Deere: D100, D105, D110, LA105, LA110, LA115, LA125, L1742, 1742HS
• Troy-Bilt/Bronco: Pony 42" and Bronco 42" with 500cc/15.5–17.5HP engines
• Craftsman: T110 500CC 17.5HP 42" riding mower compatibility

What parts are included and which OEM numbers do they replace?

The kit includes a D110-style carburetor plus a compatible air and oil filter to streamline maintenance during a single repair session. Each component is intended to substitute common OEM reference numbers so you can identify fitment quickly.

• Carburetor replaces: 594593, 591731, 594601, 594605, 796078, 590400
• Air filter included: 796031 (replaces 590825, 594201)
• Oil filter included: 492932-S
• Also ships with a pre-filter 797704 for added particle protection

How difficult is installation and what tools are needed?

Installation is typically a mid-level DIY job for anyone comfortable with small-engine maintenance. You will remove the old carburetor, transfer linkage and gaskets, then bolt in the replacement and reconnect fuel and throttle components. If the mower has additional vacuum or vent lines, note their positions before disassembly.

• Common tools: socket set, screwdrivers, pliers, gasket scraper
• Suggested supplies: new carburetor gasket, fuel line clamps, anti-seize or thread locker
• Estimated time: 45–90 minutes depending on access and experience

Who is this for: This BioLion D110 carburetor kit is aimed at homeowners and small-fleet operators who maintain John Deere D100-series and similar 42" riding mowers, plus owners of compatible Troy-Bilt, Bronco, and Craftsman models. It suits anyone wanting a ready-made repair solution with matching air and oil filters included to minimize repeat trips to the parts store. If your tractor shows rough idling, hesitation under load, or hard starts and you have the right model numbers listed above, this kit gives the components needed to restore reliable operation without sourcing separate parts.