About
XTNG Development History & Technical Evolution
The evolution of XTNG began with a fundamental question: whether a mechanical fuel system could provide a practical alternative to modern fuel injection while preserving the simplicity, character, and adjustability of traditional two-stroke engines.
Today, fuel injection systems such as EFI, TPI, and TBI have become increasingly common. While these systems offer clear advantages in emissions control and automation, they are often associated with higher cost, greater system complexity, and reduced mechanical transparency. For many riders, the carburetor remains an essential part of the two-stroke experience. However, conventional carburetor systems require frequent jetting adjustments in response to changes in altitude, temperature, and humidity, which limits their practicality in dynamic environments.
XTNG was established in 2018 as a company focused on the research, development, and manufacturing of mechanical fuel atomization systems. From the third-generation platform onward, all core parts have been manufactured and processed in mainland China, allowing tighter control over quality, supply consistency, and production efficiency.
The XTNG team is composed of riders and mechanics with extensive practical experience in off-road motorcycles. This background has continuously shaped the company’s development philosophy: to design products that solve real-world riding and tuning problems rather than simply repeating existing concepts.
Between 2019 and 2020, XTNG developed its first-generation carburetor platform, known as GEN1. This product was based on the metering rod principle and introduced a smoother venturi structure derived from the HV concept in order to improve airflow stability and engine performance. Subsequent developments in the industry further confirmed the importance of smooth airflow in maximizing engine efficiency and power delivery.
From May 2021 to May 2022, XTNG introduced the GEN2 platform, which fully replaced GEN1 after key structural limitations had been identified in the earlier design. The most significant issue in GEN1 was insufficient low-end torque. By redesigning the slide into an “H”-type structure, GEN2 improved sealing performance and airflow control while retaining the idle mixture circuit. This resulted in significantly stronger bottom-end performance and earned broad recognition from users.
In September 2022, XTNG launched its third-generation platform, GEN3 / GEN3-PRO, marking a major architectural advancement in the product line. This generation adopted a teardrop-shaped venturi design, a fully enclosed float chamber with internal pressurization, and an external metering rod adjustment mechanism. At the same time, it retained the company’s multi-circuit control philosophy, including fuel assist, air assist, and Power Jet systems, thereby greatly expanding the tuning range and adaptability of the carburetor.
Through long-term product development and real-world testing, XTNG identified a core limitation in traditional single-circuit metering rod carburetors: adjustments intended to improve one operating range often compromised another. Optimizing the metering rod for idle quality or low-end torque could disrupt mid-range or top-end fueling, while tuning for high-rpm performance could negatively affect idle stability and overall rideability. This understanding led XTNG to further refine its multi-circuit architecture, enabling more independent and precise control across different throttle positions.
In November 2024, XTNG released its latest-generation platform, GEN3+. Built upon the GEN3-PRO foundation, GEN3+ introduced a refined fuel pressurization system, also understood as an internal venting architecture, which significantly improved throttle response and the overall powerband. The metering rod logic was comprehensively redefined, resulting in more precise, more predictable, and more application-specific fuel control.
GEN3+ retained XTNG’s highly regarded fuel-assist and air-assist circuits while further expanding system flexibility through additional user-serviceable options, including torque-enhancing circuitry and compatibility with auxiliary electronic systems. The platform supports both multi-circuit operation and a fully simplified single-circuit mode equivalent in operating logic to competing single-circuit metering rod systems. This gives beginner users a more accessible setup path while allowing experienced tuners to unlock the full potential of a non-compromise multi-circuit architecture.
Throughout this development process, XTNG has continuously refined its systems through iterative testing, failure analysis, and practical application. By building upon publicly known technologies while introducing structural and functional innovations of its own, XTNG has played an important role in redefining the development direction of metering rod carburetors.
This process has included setbacks, trial and error, and technical challenges. However, through systematic learning, continuous optimization, and disciplined risk control, XTNG has gradually established its current level of technical maturity and product capability.
XTNG sincerely appreciates the support of loyal customers, partners, and friends who have contributed feedback, trust, and assistance throughout this journey. Their support has been an essential driving force behind the company’s continued growth and innovation.
