Akrapovic exhaust Honda MSX125 S-H125R6-ASZT/1 360° — drag me
2.0 k g
02 · Data & docs

The facts.

Technical data
BrandAkrapovic
Part numberS-H125R6-ASZT/1
FitmentHonda MSX125 and MSX125 Grom (2016–2020)
LineRacing Line (Titanium) — complete system
MaterialTitanium
Weight2.0 kg (stock 4.3 kg, saving 2.3 kg / 53.5 %)
Power9.9 PS (stock 9.1 PS, gain 0.7 PS at 6,800 rpm)
Torque11.4 Nm (stock 11.2 Nm, gain 0.7 Nm at 2,950 rpm)
InstallationApprox. 30 minutes
Road approvalNone — track use only
DescriptionThe whole story

Nine point one horsepower. That is the smallest engine output in this entire catalogue — smaller than the Yamaha MT-125's 13.1 and smaller than the Honda CB350's 19 — and it belongs to a 125 cc single in a motorcycle the size of a bicycle.

Key Features

  • 2.0 kg against the standard 4.3 kg: 2.3 kg and 53.5 per cent less
  • Complete titanium racing system
  • 0.7 Nm more at 2,950 rpm — barely above idle
  • 9.9 PS, up from 9.1 PS
  • The smallest engine in this catalogue
  • Thirty minutes to fit
  • No road approval — circuit use only

Half the Weight of the Bike's Exhaust

The Grom weighs 102 kg wet, and its standard exhaust accounts for 4.3 of that — over four per cent of the whole motorcycle in one component. Taking 2.3 kg out of it is proportionally the largest weight reduction available anywhere in this range.

On a machine this light, two kilograms is something a rider feels lifting the bike off its stand, never mind riding it.

What a Grom Is For

Honda's MSX125 is not transport in any serious sense. It is a 125 cc single with twelve-inch wheels, bought by people who already own motorcycles and want something to ride round a paddock, take to a track day as a pit bike, or simply modify.

That community is the reason a titanium racing system for a 9 PS engine exists at all, and it is why the absence of road approval is less of an obstacle here than on almost anything else in this catalogue.

Torque at Three Thousand

0.7 Nm at 2,950 rpm. In absolute terms that is nothing; proportionally it is over six per cent of what the engine makes, and it arrives right at the bottom where a small single is weakest.

We are not going to describe 0.7 PS as transformative. What the system delivers is weight, sound and appearance, and the numbers are what they are.

What the Slash-One Means

The /1 marks a revision. Akrapovic keeps the base number when a part is improved rather than replaced by a different design, and appends a digit to mark the newer version. This is the current one.

A Complete System, Not a Silencer

Headers, mid-section and muffler all come off and are replaced. That is why 53.5 per cent comes off where a slip-on on a machine this size would manage half as much — and why the standard exhaust deserves a box in the loft rather than a trip to the recycling centre.

A Grom holds its value unusually well, and one sold with all its original parts is a considerably easier sale.

Fitment and Compatibility

S-H125R6-ASZT/1 covers the Honda MSX125 and MSX125 Grom from 2016 through 2020. Honda revised the Grom for 2021 with a five-speed gearbox and different bodywork; those machines take S-H125SO4-ASZTBL.

Road Approval

None. This product does not meet emission compliance requirements for street or highway use.

Specifications

  • Part number: S-H125R6-ASZT/1
  • EAN: 3831113569972
  • Fitment: Honda MSX125, MSX125 Grom (2016–2020)
  • Line: Racing Line (Titanium), complete system
  • Material: titanium
  • Weight: 2.0 kg (stock 4.3 kg, saving 2.3 kg / 53.5 %)
  • Power: 9.9 PS (stock 9.1 PS, gain 0.7 PS at 6,800 rpm)
  • Torque: 11.4 Nm (stock 11.2 Nm, gain 0.7 Nm at 2,950 rpm)
  • Installation time: approx. 30 minutes
  • Road approval: none — track use only
  • Country of manufacture: Slovenia
FitmentWhich bikes this fits
  • Honda MSX125 and MSX125 Grom (2016–2020)
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08 · Paddock

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