Yoshimura · RS-2 · Full System
The Yoshimura RS-2 Race Series Exhaust System is a full system built for the Kawasaki Z125-PRO 2017–2026. Designed around the compact Z125 PRO platform, it pairs a carbon muffler with a Race Series layout to deliver a clean, aggressive look and a refined exhaust package for small-displacement street use.
Key design touches include a Works Finish treated header surface for added durability and a titanium-style appearance, plus a diamond-shaped sleeve and a large core with increased muffler packing volume aimed at quieter operation. This system also includes an oversized 18mm O2 adapter for the application.
Engineering
Yoshimura applies its proprietary Works Finish header surface treatment to add a titanium-look appearance while improving durability. It’s a detail that complements the Z125 PRO’s styling and helps the system look at home on a mini street machine, whether it’s used for commuting, club racing, or weekend rides.
Sound
The RS-2 features a diamond-shaped sleeve and a stainless steel cone end-cap, combining distinctive Race Series styling with purpose-built construction. A large core and increased muffler packing volume are designed for quieter operation, while keeping the compact proportions that suit the Z125 PRO.
Fitment
This full system is built specifically for Kawasaki Z125-PRO 2017–2026 and includes an oversized 18mm O2 adapter for the application. The specifications table below also lists the included sound insert as INS-25-K, with spark arrester options shown in the insert and spark arrester table.
Engineering
As part of Yoshimura’s Race Series Exhaust System lineup, the RS-2 full system brings a performance-minded layout to the Z125 PRO. Construction details called out by Yoshimura include a stainless steel header and tail-pipe, along with a stainless steel cone end-cap. The carbon muffler and diamond-shaped sleeve complete the RS-2 Mini-inspired profile for a compact machine that benefits from carefully scaled components.
Performance
For riders looking to reduce weight, Yoshimura reports the system is 2.9 lbs lighter. That verified claim appears in the performance section, and it’s supported by the Race Series approach used throughout this RS-2 full system design. The result is a focused exhaust package intended to suit the Z125 PRO’s lightweight, agile character.
Sound
This Yoshimura RS-2 full system is listed for Kawasaki Z125-PRO 2017–2026; confirm exact application details in the fitment table below. An installation PDF is provided on the page to help guide the process. For sound tuning, the specifications list Sound Insert (Included) as INS-25-K, and the sound insert and spark arrester table outlines available options, including spark arrester code SA-23-K as not included.
Figures as reported by Yoshimura.
| Part Number | 14120AB251 |
|---|---|
| Brand | Yoshimura |
| Product Line | Race Series Exhaust System |
| Series | RS-2 |
| System Type | Full System |
| Material | Carbon |
| Sound Insert (Included) | INS-25-K |
| Spark Arrester | Not included |
| Shipping Weight | 12 lb |
| Barcode | 00840025908277 |
| Emissions Compliance | QUALIFIED MANUFACTURER DECLARED "MODIFIED PART" |
| Make | Model | Model Years |
|---|---|---|
| Kawasaki | Z125-PRO | 2017–2026 |
Fitment as listed by Yoshimura for part number 14120AB251.
| Part Number | Type | Included With This System |
|---|---|---|
| INS-25-K | Sound Insert | Yes |
| SA-23-K | Spark Arrester | No |
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
