JMCHstore Performance Carburetor for 50–105cc Mini Bikes & Go-Karts — Replaceable Main Jet, Rich Low-Speed Tuning

High-flow replacement carburetor for 50–105cc mini bikes and go-karts that restores fuel delivery, adds tunability with a richer main jet, and retains factory fitment for easy swap-in.

This JMCHstore performance carburetor is designed as a direct-replacement upgrade for a wide range of small engines — including Monster/Mega Moto MM-B80 and MM-B105, Coleman and Mototec 105cc models, Motovox MBX series, Baja DB30 97cc, Phatmoto 79cc bikes, and many Chinese Lifan-style engines. It keeps the stock mounting pattern and throttle orientation while adding a replaceable rich main jet, larger low-speed jet, horizontal fuel outlet and included breather filter so you can tune and run reliably after aftermarket modifications like muffler drilling or straight-pipe swaps.

Will this carburetor fit my mini bike or go-kart?

Most likely yes if your machine uses common 50–105cc horizontal shaft engines and shares the same intake flange and throttle linkage layout as the listed models. The JMCHstore unit preserves OEM-style throttle connection and flange orientation for easier bolt-on installation.

• Compatible models: Monster/Mega Moto MM-B80, MM-B105; Motovox MBX10/11/12; Mototec 105cc; Coleman B100/RB100; Baja DB30 (97cc); Phatmoto 79cc, and other Lifan 152-3 style engines.
• Keeps horizontal fuel outlet for simple fuel line routing and good flow.
• Includes gaskets, fuel hose, clamps and a fuel filter for complete replacement.

How does the replaceable main jet and larger low-speed jet help performance?

The included richer main jet allows more fuel flow at higher throttle, compensating for increased air intake from performance air filters or modified mufflers to maintain safe combustion. The large low-speed jet helps resolve idle and low-RPM drivability when exhaust or intake changes lean the mixture.

• Replaceable rich main jet pre-installed and an extra rich jet included for tuning.
• Large low-speed jet supplied to stabilize idle after straight-pipe or muffler drilling.
• Idle adjustment screw and spring let you fine-tune idle speed and response.

What does the kit include and how does it simplify installation?

JMCHstore ships this carburetor as a ready-to-install package with the basic hardware and small parts you’ll need to swap it into most compatible engines. That cuts trips to the parts store and reduces downtime while giving you the jets and breather components required after removing stock air boxes.

• Included: new carburetor, replacement rich main jet, extra large low-speed jet, inline fuel filter, three gaskets, fuel line, and two hose clamps.
• Air filter breather provided for valve-cover vent when the stock box is removed.
• Throttle spring and horizontal outlet follow factory layout for straightforward reconnection.

Will I need special tools or additional parts to tune it?

Basic hand tools and a small flat or Phillips screwdriver are usually enough to fit and set the carb. For advanced jetting or dyno work you may want a set of jets and a tachometer, but the supplied jets are intended to cover common aftermarket modifications.

• Standard socket or wrench set for mounting bolts and throttle linkage adjustments.
• Screwdriver for idle and mixture adjustments; pliers for clamps and fuel line routing.
• Optional: additional jet sizes and a tachometer for precise tuning under load.

Who this is for: Riders, DIY mechanics and small-engine tuners who need a dependable, performance-oriented replacement carburetor for 50–105cc mini bikes, go-karts and similar machines. It’s especially useful if you’ve fitted a high-flow air filter, modified the exhaust or need simpler breather and fuel routing after removing the stock airbox. The JMCHstore unit balances plug-and-play installation with extra tuning options to restore drivability and support modest performance upgrades.