WR125R 2026 RS-2 Full Exhaust: Race Setup and Fit FAQ
By Yoshimura R&D of America, Inc. | Published: 2026-11-05
Category: ハウツーガイド
Straight answers on fitting and setting up the RS-2 stainless full exhaust on the 2026 Yamaha WR125R, including weight savings, power gains and spark arrestor details.
WR125R RS-2 full exhaust: common questions
- Will the RS-2 full exhaust fit my 2026 WR125R?
- The product is listed for the 2026 WR125R, which is the fuel-injected, liquid-cooled, 6-speed 125cc model Yamaha introduced. The supplied record does not list other model years, so treat this as a 2026-specific fitment unless your dealer confirms otherwise.
- What performance gains does the RS-2 deliver?
- Yoshimura reports the system is over 4 lbs lighter than the stock exhaust and adds up to 14.7% more horsepower at 7,800 rpm and up to 13.3% more torque at 7,800 rpm, while smoothing out the powerband.
- Is the RS-2 a full system or a slip-on?
- It is a full exhaust system, not a slip-on. The listing describes it as a stainless full exhaust with an aluminum muffler, so it replaces the complete stock exhaust.
- Does it come with a spark arrestor?
- Yes. The Race Series system includes a USFS spark arrestor already installed, so you can head straight to the wilderness. The record also lists a volume insert and sound insert options (SA-02-K, INS-11-K, INS-12-K), but specific sound levels are not provided.
- Where is the RS-2 made?
- The system is engineered, developed and built in Chino, California, by Yoshimura.
- What should I check before installing?
- The supplied information does not include step-by-step installation instructions or required tools. Before you start, confirm you have the correct gaskets and hardware for your bike, and check your local regulations for race-only or street use. If you are unsure, have a qualified mechanic perform the install.
Product facts: WR125R 2026 RS-2 Stainless Full Exhaust
- WR125R 2026 RS-2 Stainless Full Exhaust, w/ Aluminum Muffler: Lighter than stock exhaust by over 4 lbs. Weight savings help the small-bore WR125R feel more responsive and easier to handle.
WR125R 2026 RS-2 Stainless Full Exhaust, w/ Aluminum Muffler - WR125R 2026 RS-2 Stainless Full Exhaust, w/ Aluminum Muffler: Adds up to 14.7% more hp @7800 rpm and up to 13.3% more torque @7,800 rpm. These gains are concentrated at 7,800 rpm, so you can expect stronger pull in the mid-to-upper rev range.
- WR125R 2026 RS-2 Stainless Full Exhaust, w/ Aluminum Muffler: USFS spark arrestor already installed. You can ride in spark-arrestor-required areas without buying an extra part.
