Workshop record · 1992 – today

Every RS125, in one place.

The English-language record of the Aprilia RS125, from the two-stroke Extrema and GS to the current four-stroke. Generations, identification, a 13-part restoration, and the UK rules for riding and importing one. If a figure is not sourced, it is markedTo verify and left blank.

Identify your bike Start the restoration

7Generations, 1992 to the current four-stroke

13Restoration guides, with the holes left visible

2Rotax engines that do not share parts

0Invented torque figures, jet charts or prices

Generations

From the rectangular headlight to the four-stroke

Open the hub

01 · 1992–1995

Extrema / GS

Rotax 123

02 · 1995/96–1998

Round-light RS 125

Rotax 123 for most of Europe and the UK until about 1997–98, or Rotax 122 in Italy from 1995

03 · 1999–2005

Bee-tail

Rotax 122

04 · 2006–2007

RSV-style

Rotax 122

05 · 2007/08–2012

Euro 3

Rotax 122

06 · 2011–about 2016

RS4 125

124.2 cc DOHC four-valve four-stroke, fuel injection, derived from the Derbi GPR125

07 · About 2017–today

RS 125 four-stroke

The same four-stroke family as the RS4. Euro 5 update in 2021. Euro 5+ update in 2025.

Model history · 1998

Rossi replica, and the Chesterfield years

Full identification table

The 1998 Rossi replica livery, set against the years Chesterfield is actually listed
Check	1998 Rossi replica livery	Chesterfield schemes
Livery documented for 1998?	Yes. rs125.it and Decalmoto list the 1998 Rossi replica.	Not as a 1998 scheme. Chesterfield is listed for 1994, Biaggi Chesterfield for 1995–96, and Chesterfield for 1999–2005.To verify
Likely engine	Rotax 122 and a PHBH 28, because Italy moved to the 122 in 1995.To verify on the casting.	Either a GS with a Rotax 123 and a VHSB 34, or an MP with a Rotax 122.To verify
Paperwork	If it is not yet UK-registered: over 10 years old, so no MSVA. NOVA, then a V55/5.	MOT and V5C, if it is already on a UK document.

Start with the job you actually have

01I don’t know which one this is

Frame number, engine casting, carburettor. 1998 can be either Rotax.

02I’m about to buy one

Ten checks, the red flags by generation, and no made-up prices.

03I’m taking one apart

Thirteen guides. Tools, steps, and a torque column that says To verify.

Contents

The restoration, in order

UK law and import