JMCHstore Performance Carburetor for 79–105cc Mini Bikes — Replaceable Main Jet, Tunable Low-Speed Jet

High-flow replacement carburetor for 79–105cc mini bikes and gas bikes that preserves factory throttle feel while adding a richer main jet and tunable low-speed jet for improved engine response.

This JMCHstore performance carburetor is built as a direct-fit upgrade for a wide range of small-displacement engines including Monster/Mega Moto MM-B80/MM-B105, Motovox MBX10 series, Mototec 105cc, Coleman B100/RB100, Baja DB30 97cc and many Lifan-based 79–105cc bikes. It keeps the original mounting layout and throttle geometry so installation is straightforward, while supplying a larger main jet and an oversized low-speed jet to help engines that have been modified or that need richer fueling after exhaust or intake changes. A horizontal fuel outlet, new idle adjuster and included breather filter make it practical for conversions where the stock airbox is removed.

How does this carb improve throttle response and power?

The carburetor increases airflow and ships with a richer main jet to match that added air volume. That richer main jet helps prevent lean conditions at mid-to-high throttle and supports more consistent power delivery when the bike has an upgraded exhaust or drilled muffler. The improved throttle spring and preserved factory throttle geometry maintain a predictable, factory-like feel.

• Richer replaceable main jet for better mid/high-throttle fueling
• Throttle spring and design retain original control feel
• Horizontal fuel outlet for reliable fuel flow during installation changes

Will this carb let my engine idle properly after exhaust or intake changes?

Yes — the carb arrives with a large low-speed (pilot) jet to help engines that would otherwise race or stall after modifying the muffler or removing the airbox. The new idle speed screw and spring let you fine-tune idle RPM easily, and the package includes gaskets and fittings needed for a clean install.

• Large low-speed jet included to stabilize idle after modifications
• Adjustable idle screw and spring for precise idling
• Gaskets, fuel line, clamps and fuel filter provided for complete swap

Is this carburetor compatible with my mini bike or gas bike model?

This unit was designed to fit many popular 79–105cc platforms. It is compatible with Monster/Mega Moto MM-B80 and MM-B105, Motovox MBX10/MBX11/MBX12, Mototec 105cc, Coleman B100/RB100, Baja DB30 97cc and similar Lifan 152-3 engines, plus several Phatmoto and Mega Moto 79–80cc models. Check mounting points and throttle linkage against your current carb to confirm physical fit.

• Fits MM-B80, MM-B105, MBX10/MBX11/MBX12, Mototec 105cc, Coleman B100/RB100
• Compatible with Baja DB30 97cc and many Lifan-based engines
• Includes breather filter for valve-cover vent when removing stock airbox

What hardware and parts come in the box to make installation easier?

The kit arrives ready to install with a generous set of replacement parts so you can swap carburetors with minimal additional purchases. It includes jets for richer main and larger low-speed operation, a fuel filter and hose, clamps, and multiple gaskets. The included breather solves the common valve-cover vent issue when the stock airbox is removed.

• 1 × carburetor, 1 × rich main jet, 1 × large low-speed jet
• 1 × fuel filter, 1 × fuel line, 2 × hose clamps, 3 × gaskets
• Air filter breather for valve-cover vent tube when airbox is removed

Who this is for: Riders who own small-displacement minibikes, dirt bikes or gas bikes with 79–105cc engines and who want a straight-forward replacement carb that maintains stock throttle characteristics while providing richer fueling for modified exhausts, drilled mufflers, or removed airboxes. It's also suited for mechanics and hobbyists who prefer a plug-and-play upgrade with the essential jets and hardware included.