nibbi 24mm PE Carburetor Kit for 140–150cc Dirt Bikes & ATVs — 48mm Flange, Tunable Jets

NIBBI's PE24mm carburetor kit is a complete 24mm flange replacement designed to deliver precise fuel metering and reliable fitment for 140cc–150cc dirt bikes, pit bikes, ATVs and 4-wheelers.

This high-strength aluminum carburetor assembly is built to replace worn or damaged stock carbs on popular small-displacement motorcycle engines. It ships pre-fitted with tuning jets and includes spare jets so you can dial fuel delivery for elevation, riding style, or aftermarket exhausts. The kit’s leak-reduction features and easy two-bolt flange installation make it a practical upgrade for riders who want predictable throttle response without complicated rework.

How does the NIBBI PE24mm kit improve throttle response?

The carburetor uses a high-hardness oil needle plunger and a hollow float to maintain consistent fuel flow into the venturi, which reduces hesitation and uneven throttle transitions. The horn-shaped intake helps smooth airflow into the engine for crisper midrange and top-end response.

• High-hardness needle plunger for stable fuel cut-off
• Hollow oil float to reduce fuel starvation under acceleration
• Horn-shaped intake for improved air velocity and smoother throttle
• Pre-installed #112 main jet and #40 slow jet for balanced baseline tuning

What jets are included and how do I tune them?

Out of the box the carburetor comes with a #112 main jet and a #40 slow jet, plus three extra main jets (#108, #110, #115) and one spare slow jet (#35). Swapping jets changes fuel volume for different conditions—use smaller numbers for leaner mixtures and larger numbers for richer mixtures.

• Included jets: #112 main, #40 slow (pre-installed)
• Extra mains: #108, #110, #115 for rich/lean adjustments
• Replacement slow jet: #35 for fine idle/low-throttle tuning
• Adjust jets incrementally and test under real riding conditions

Will this carburetor fit my motorcycle or ATV?

The flange is engineered to match common 140–150cc engines and many popular brands such as Yamaha, Honda, Suzuki and Kawasaki. Confirm fit by comparing your old carburetor’s two-bolt flange spacing (48mm) and overall shape to the product images before ordering.

• Flange two-hole distance: 48mm — verify before purchase
• Designed for 140cc–150cc dirt/pit bikes and small ATVs
• Works with many OEM intake manifolds sharing the PE24mm footprint
• Refer to kit photos to confirm visual match with your existing carb

How difficult is installation and maintenance?

Installation is straightforward for anyone comfortable with basic motorcycle maintenance: remove the old carb, match the flange and vacuum/ throttle connections, then tighten the two mounting bolts. Routine maintenance consists of cleaning the jets and float bowl and checking the needle and float for wear to preserve leak-free operation.

• Simple two-bolt flange mount — 48mm spacing
• Clean jets and float bowl periodically for consistent performance
• Inspect the high-hardness needle plunger for signs of wear
• Use included spare jets to adapt to altitude or intake/exhaust changes

Who is this for: Riders and mechanics replacing a failing stock carb or seeking an affordable, tunable upgrade for 140–150cc dirt bikes, pit bikes, four-wheelers and ATVs. It’s aimed at hobbyists and weekend racers who need reliable fuel control, a secure flange fit, and spare jets for quick on-bike adjustments without aftermarket fabrication.