Akrapovic exhaust Yamaha MT-125 S-Y125R11-HZT 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandAkrapovic
Part numberS-Y125R11-HZT
FitmentYamaha MT-125, YZF-R125 and YZF-R25 (2021–2026)
System typeRacing Line, complete system
MaterialsTitanium
NoteAkrapovic publishes no measured weight or power figures for this system
SoundRacing sound output
Road approvalEC type approval and ECE type approval
DescriptionThe whole story

A complete Racing Line for a 125 that keeps its EC and ECE type approval. That combination is unusual enough to be the point of the product: headers, collector and silencer all replaced, and the registration document stays untouched.

Key Features

  • Complete system: headers, collector and silencer replace the entire standard exhaust path
  • Titanium construction throughout
  • EC and ECE type approved — a full system that stays road legal
  • Racing sound output, which is what a Racing Line is built for
  • Fits the MT-125 naked, the YZF-R125 sportbike and the YZF-R25
  • Akrapovic publishes no measured weight or power figures for this system

Why There Are No Numbers on This Page

For most systems in this catalogue Akrapovic publishes a dyno sheet and a weight, and those figures appear here. For this one the manufacturer publishes neither. Rather than estimate from a comparable part or repeat brochure language, this page says so plainly: there is no measured weight saving and no measured power gain to report.

What is documented is the construction, the materials and the approval, and those are real. If a measured figure matters to your decision, ask us and we will put the question to Akrapovic before you order.

What an A1 Rider Can Expect

The MT-125 and YZF-R125 sit inside the A1 licence class at 15 PS, and the law caps them there. A type-approved exhaust cannot lift a 125 past that limit without taking the homologation with it — so nobody should expect a meaningful power increase from this system, and none is claimed.

What a full system changes on a small engine is the character: the whole exhaust path is replaced rather than just the silencer, which affects how the engine picks up and how it sounds. The YZF-R25, with 249 cc and around 35 PS, sits in the A2 class and has more room to respond.

What a Full System Means Here

This is not a silencer swap. The headers, the collector and the standard catalytic converter all come off, and on a small bike with tight bodywork that is more work than the size of the machine suggests. Budget a workshop session rather than an evening in the garage.

What comes back on is a complete titanium path from the cylinder head. On a 125 that is a large proportion of the motorcycle's exhaust system replaced at once, and it is why a Racing Line for a small bike costs what a slip-on for a much larger one does.

The Approval Is Worth More on an A1 Bike

A 125 is often a first motorcycle, ridden to school or to work by someone who cannot afford a problem with the registration document or the insurer. A full system without type approval would put both at risk.

This one carries EC and ECE certificates, which is the whole reason it belongs in a road-bike catalogue rather than a track-only one.

Fitment and Compatibility

S-Y125R11-HZT covers the Yamaha MT-125, YZF-R125 and YZF-R25 from model year 2021 through 2026. For the earlier 2014 to 2019 MT-125 and YZF-R125 the corresponding part is S-Y125R4-HRT.

Road Approval

EC type approval and ECE type approval, with the certificates supplied and downloadable here. The system is a legal replacement for road use in the European Union and does not affect the A1 classification.

Specifications

  • Part number: S-Y125R11-HZT
  • EAN: 3831126441746
  • Fitment: Yamaha MT-125, YZF-R125, YZF-R25 (2021–2026)
  • System type: Racing Line, complete system
  • Material: titanium
  • Measured figures: none published by the manufacturer
  • Road approval: EC type approval and ECE type approval
  • Country of manufacture: Slovenia
FitmentWhich bikes this fits
  • Yamaha MT-125 (2021–2026)
  • Yamaha YZF-R125 (2021–2026)
  • Yamaha YZF-R25 (2021–2026)
07 · Support

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08 · Paddock

Before you go.

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