Choosing the right exhaust upgrade for a 125cc pit bike can improve throttle response, power delivery, and overall on-track feel. This guide focuses on five exhaust options that fit 125cc dirt bikes and deliver reliable performance for popular models from CRF50, SSR, Baja, Coolster, Taotao, and more. The selections cover both 28mm and 38mm head configurations, complete systems and muffler kits, and emphasize ease of installation, durability, and compatibility. Use the quick-start table below to compare key specs at a glance.
| Product | Brand | Fitment | Key Benefit |
|---|---|---|---|
| YYCKE 28mm Exhaust Kit | YYCKE | 125cc Dirt Bikes | Complete muffler kit; 28mm head, easy install |
| YC Yier 38mm Full System | YC Yier | 125cc Dirt Bikes | One-piece system; 38mm head; deep tone |
| FVRITO XR50/125 Big Bore System | FVRITO | 125cc Dirt Bikes | Big bore design; complete system |
| FVRITO 28mm Muffler Kit | FVRITO | 125cc Dirt Bikes | 28mm head; 1.1″ mounting; complete kit |
| HAUERTZX 28mm Exhaust Assembly | hauertzx | 125cc Dirt Bikes | 28mm head; 45mm eye-to-eye; complete kit |
YYCKE 28mm Exhaust Kit for 125cc Dirt Bikes
The YYCKE exhaust kit is designed around a 28mm head pipe with a 45mm eye-to-eye mounting distance. It is described as a complete replacement, including the muffler, head pipe, metal clip, rubber gasket, two gaskets, and a screw kit. This configuration targets popular 125cc dirt bikes such as CRF50, SSR, Baja, Coolster, Piranha, Pister Pro, Taotao 125cc, TTR, Taotao DB10/DB14, and BMS Pro 70. The assembly is touted for improving the bike’s appearance and providing a straightforward installation that remains durable over time.
In terms of performance, the kit aims to improve exhaust flow while maintaining a stock-like feel. The 28mm head size is compatible with engines in the 90cc–125cc range, which supports modest power gains and a deeper exhaust note without dramatic changes to engine tuning. Installation considerations include ensuring the head pipe aligns with the bike’s frame and that gasket surfaces are clean for a proper seal. Users should confirm compatibility with their exact model year and any aftermarket ignition or carburetor changes.
Durability and maintenance are typical highlights, with the kit described as durable and relatively simple to install. The included hardware facilitates a complete replacement, reducing the risk of missing parts during assembly. Prospective buyers should verify fitment for their exact model (especially between Chinese-made brands) and note that some minor adjustments may be needed for clearance around the exhaust path and foot pegs.
YC Yier 38mm Racing Exhaust Full System
This is a complete one-piece exhaust system that runs from the head pipe to the tail section, featuring a 38mm head and a long overall length. The listed specs indicate a pipe length of about 635mm and a muffler length of about 255mm, with a removable pipe guard for added protection. The system is advertised for a broad range of small-displacement bikes—70cc to 150cc—including SSR, Apollo RFZ 140, Thumpstar, Taotao DB17, and various Chinese pit bikes. The design aims to improve engine breathing when paired with engine modifications and to deliver a deeper, more “full” sound similar to larger CRF engines.
From an installation perspective, this full-system approach can simplify upgrading by replacing the entire exhaust path in one step rather than mixing a muffler with a separate header. The 38mm size suggests a stronger exhaust flow compared with smaller diameters, which benefits engines that have been tuned or upgraded. Potential buyers should verify the exact model’s mounting points and space under the bike’s seat and plastics to ensure a clean fit. The product’s scope includes compatibility with multiple brands, but model-by-model checks are advised.
In terms of durability, the one-piece design can reduce leak points and improve consistency across long runs. As with any full-system upgrade, anticipate changes in exhaust tone and potential changes to idle behavior or jetting if the bike’s carburetion is adjusted beyond stock. Regular inspection of welds and mounting brackets is recommended to maintain performance over time.
FVRITO XR50/125cc High Performance Big Bore Exhaust System
The FVRITO big bore exhaust system is marketed as a comprehensive upgrade with a “big bore” emphasis, intended for XR50 and CRF50-based platforms and compatible with a wide array of 70cc–125cc Chinese dirt bikes, as well as brands like SSR, Taotao, SDG, Coolster, Apollo, Roketa, Taotao, and more. The kit includes a complete head-to-tail assembly with a 28mm head and 45mm eye-to-eye dimensions, designed to deliver deeper exhaust tones and improved engine breathing when paired with compatible engine work.
Performance notes indicate potential gains in throttle response and mid-range torque, especially on stock engines that have minor porting or jetting changes. As a full-system upgrade, installation tends to be more involved than a slip-on muffler, but it offers the benefit of a unified path for exhaust gases. For best results, verify compatibility with the rider’s exact bike model and ensure adequate clearance around the exhaust path to avoid heat or interference with radiator shrouds, foot pegs, or chain/sprockets.
Durability considerations emphasize robust metal construction and a secure weld profile. Regular maintenance should focus on inspecting mounting hardware and any exposed heat shields. If the bike uses a larger carburetor or aftermarket ignition, the exhaust tuning may complement those changes, potentially reducing backpressure and smoothing power delivery across the rpm range.
FVRITO 28mm Exhaust Muffler and Pipe Kit for 50cc–125cc Bikes
This FVRITO kit focuses on a 28mm head size with an integrated muffler system designed for a broad range of Chinese pit bikes, including 50cc, 70cc, 110cc, and 125cc variants such as SSR, Taotao, Coolster, Apollo, and Roketa. The kit is described as a complete one-piece exhaust system that improves engine breathing and delivers a deeper exhaust tone while maintaining a stock-like feel. The mounting is configured for a 28mm head and a 45mm eye-to-eye spacing, which aligns with many popular Chinese pit bike frames.
Installation considerations emphasize that this is a full assembly rather than a slip-on muffler, which can simplify replacement and reduce the risk of misalignment. The kit’s durability is framed around high-quality metal materials and reliable welding. Prospective buyers should confirm exact fitment with their bike’s model and year, and consider whether any engine modifications (such as a larger carb or porting) would benefit from the exhaust’s flow characteristics.
Noise, legality, and ride feel are typical considerations with these systems. Expect a more noticeable exhaust note that some riders may describe as deeper or throatier, which can affect helmet communications and local noise regulations. Regular inspection of gaskets and mounting hardware will help ensure long-term performance and reduce the likelihood of exhaust leaks.
HAUERTZX 28mm Exhaust Assembly for 125cc Dirt Bikes
The HAUERTZX exhaust assembly emphasizes a complete kit approach with a 28mm head and 45mm eye-to-eye configuration. It’s described as a high-performance modification that minimizes the need for additional accessories, featuring durable metal construction and robust welding. The kit is marketed as compatible with a wide range of 50cc–125cc pit bikes including CRF50, CRF70, XR50, Taotao DB10/DB14, Baja, Xpro, Apollo, Rocketa, TTR, SDG, Coolster, SSR110, and SSR125.
Users should expect a relatively straightforward bolt-on installation if the bike’s stock exhaust mounting points align with the kit’s mounting brackets. The 28mm head diameter and standard 45mm spacing suit many popular frames, but precise clearance near the engine, chain, and foot pegs should be checked prior to installation. Durability and heat resistance are highlighted, with a focus on long-term reliability in varied riding conditions and climates.
Buying Guide
Buying Guide
Key fitment considerations
- Engine size compatibility: Check that the kit explicitly states support for 125cc engines or higher, as some options span 70cc–150cc ranges.
- Head diameter and mounting spacing: Most 125cc kits use 28mm or 38mm heads with standard 45mm eye-to-eye spacing. Verify your bike’s head tube diameter and frame clearances.
- Model alignment: Confirm fitment with your bike family (CRF50/CRF70, SSR, Taotao, Coolster, Baja, Apollo, Roketa, etc.) and confirm any model-year nuances.
Exhaust system type: full system vs slip-on
- Full-system upgrades replace the header and muffler as a single unit, often improving airflow and tone but requiring more space for installation.
- Slip-on or muffler-only upgrades are easier to install but offer more modest performance gains; compatibility depends on your header design and mounting hardware.
Materials and durability
- Common materials include aluminum and steel composites; look for welded joints and corrosion resistance suitable for off-road conditions.
- Durability is influenced by heat shielding and mounting hardware; check whether heat guards are included or if aftermarket shields are recommended.
Sound, tuning, and legality
- Exhaust tone varies by diameter, length, and baffle design; deeper notes are typical with 28mm or 38mm systems but can affect helmet communication.
- Local noise regulations may apply in some riding areas; compare decibel levels if available and consider if you ride on trails with stricter limits.
Installation and maintenance
- Assess the required tools and whether gasket sealing surfaces need machining or cleaning for a proper seal.
- Ensure that all included hardware (clamps, gaskets, screws) is available and that you have space around the header for installation clearance.
Compatibility and price considerations
- Price often reflects the completeness of the kit and the diameter of the head pipe. More complete kits with 38mm systems may offer better flow for tuned engines.
- Look for warranties or return policies, especially when buying from third-party brands that service multiple Code regions.
In sum, a well-chosen 125cc pit bike exhaust should improve airflow and throttle response while delivering a sound that matches rider preference and local rules. Cross-check the exact bike model and confirm that the head diameter and mounting spacing align with your frame. The five options highlighted here cover a range of install styles (complete systems to full assemblies) and are designed to offer durable builds for off-road riding scenarios.