Please note: These pages are part of my RS 125 Workshop Page on my web blog and they are not related to the manufacturer Aprilia/Piaggio. These are self-written repair instructions, hints, tips and tricks for the old Aprilia RS 125 with two-stroke engine until year 2012. This blog is operated by a private individual without commercial background and without any benefits. There is absolutely no warranty. Any liability for any kind of damage that may be related to information from this website is totally denied. Use at your own risk.
Here you will find an overview of all light bulbs used in the Aprilia RS 125.
You can also find those in the technical data at the end of your users manual, however, in this article they are listed with socket and ECE standard labels.
Some of those light bulbs are regulated, light bulb and light assembly are tested and licenced as one part according to the corresponding ECE regulations. This sounds complicated, but it just means that you have to use a certified “W5W” bulb for licence plate illumination or park light. You will find the marking on the parts which shows those requirements. There are more than just one bulb for the corresponding socket, in this case, there are lots of different bulbs available with W2.1×9.5d socket. Just search for the corresponding ECE labels while shopping and you’re fine.
1995 to 1998
Bikes from year 1995 to 1998 use light bulbs as listed below, these are the GS and MPA models with both Rotax 122 and Rotax 123.
| Description | Quantity | ECE | Socket | Rating |
|---|---|---|---|---|
| Low leam | 1 | H1 | P14,5s | 55 W |
| High beam | 1 | H3 | PK22s | 55 W |
| Park light | 1 | W5W | W2,1×9,5d | 5 W |
| Rear light | 1 | P21/5W | BAY15d | 21 W & 5 W |
| Licence plate illumination | 1 | W5W | W2,1×9,5d | 5 W |
| Turn indicator | 4 | R10W | BA15s | 10 W |
| Speedometer backlight | 4 | – | W2,1×9,5d | 2 W |
| LCD display backlight | 1 | – | W2x4,6d | 2 W |
| Fuel level indicator light | 1 | – | W2x4,6d | 2 W |
| Other indicator lights | 3 | – | W2x4,6d | 1,2 W |
1999 to 2005
Bikes from 1999 (MPB and SF) have more or less the same bulbs but more powerful indicator and display backlights, the licence plate illumination is now integrated in the back light.
| Description | Quantity | ECE | Socket | Rating |
|---|---|---|---|---|
| Low beam | 1 | H1 | P14,5s | 55 W |
| High beam | 1 | H3 | PK22s | 55 W |
| Park light | 1 | W5W | W2,1×9,5d | 5 W |
| Rear light | 1 | P21/5W | BAY15d | 21 W & 5 W |
| Turn indicator | 4 | R10W | BA15s | 10 W |
| Speedometer backlight | 4 | – | W2,1×9,5d | 2 W |
| LCD display backlight | 1 | – | W2x4,6d | 3 W |
| Indicator lights | 4 | – | W2x4,6d | 2 W |
2006 to 2012
Beginning with the PY bike, all indicators are integrated into one speedometer assembly and also headlight is completely different. Therefore there are less bulbs on this bike.
| Description | Quantity | ECE | Socket | Rating |
|---|---|---|---|---|
| High and low beam | 2 | H11 | PGJ19-2 | 55 W |
| Park light | 2 | W5W | W2,1×9,5d | 5 W |
| Rear light | 1 | P21/5W | BAY15d | 21 W & 5 W |
| Licence plate illumination | 1 | W5W | W2,1×9,5d | 5 W |