# Aprilia RS 50, RS 125 and RS4 Key Replacement

Aprilia's small sport bikes keep things simple.

Source: https://themotorcyclelocksmith.com/san-diego/makes/aprilia/rs-125-rs4-rs-50/

Business: The Motorcycle Locksmith, mobile motorcycle locksmith. Phone and text: (619) 775-1858 (San Diego side).

> Aprilia's small sport bikes keep things simple. The owner's books for the RS 50, RS 125, RS4 50 and RS4 125 all describe two ordinary keys, one of them a spare, and none of them has an immobilizer section. The one key works the ignition and steering lock, the fuel tank lock and the saddle lock, so a lost key is replaced by cutting a new one to the bike.

**Aprilia RS 50, RS 125 and RS4 key quick facts**

- Aprilia's use and maintenance books for the RS 50 and RS 125 say the key operates the ignition switch and steering lock, the saddle lock and the fuel tank lock.
- The RS4 50 and RS4 125 owner's manuals say the same in newer wording: ignition switch and steering lock, fuel tank cap lock and saddle lock.
- All four books state that two keys are supplied with the vehicle, one of them a spare.
- On the RS4 125 the fuel cap sits under a lock protection cover and can only be refitted with the key inserted.
- The RS 125 book warns you to check that the key has not been left in the glove and tool kit compartment before locking the saddle.
- None of these manuals describes an immobilizer, a coded key or a key programming procedure.

## Aprilia RS 50, RS 125 and RS4 key types by year

| Years | Models | Key type | Chip | Notes |
| --- | --- | --- | --- | --- |
| 2003 edition manuals | RS 50, RS 50 Tuono, RS 125, RS 125 Tuono | mechanical cut key | no | Two keys supplied. Ignition and steering lock, saddle lock and fuel tank lock on one key. |
| 2010s | RS4 50 | mechanical cut key | no | Two keys supplied. The key turns clockwise to open the fuel cap and to release the rider saddle. |
| 2012 manual | RS4 125 | mechanical cut key | no | Two keys supplied. Fuel cap lock sits under a protective cover; the cap closes only with the key in it. |

## Small Aprilias and the chip key question

Aprilia's larger road bikes moved to transponder keys with a user code, and that reputation follows the brand down to its smallest models. It does not apply here. The RS 50 and RS 125 two-strokes and the RS4 four-strokes that replaced them have an ignition switch on the upper steering plate with three positions, ON, OFF and LOCK, and a key that is nothing more than cut metal. The manuals describe the positions and when the key can be taken out, and that is the whole key chapter.

If a seller or a parts counter tells you that your RS needs a code card or a dash procedure for a new key, they are thinking of a different Aprilia.

**Need a key for your RS 50?** Call or text with the year and where the bike is parked. Call or text (619) 775-1858.

## Ignition, tank and saddle

Everything is on one key, and the bike was delivered with only two. A used bike may come with only one of them.

- Ignition switch and steering lock: set the key to OFF, then push it in and turn it toward LOCK while easing the handlebar round until it catches
- Fuel tank lock: insert the key, turn it clockwise and lift the cap or flap
- Saddle lock on the RS 50 and RS 125: the key releases the rider saddle, with a small glove and tool kit compartment beneath
- Saddle lock on the RS4: the key releases the rider saddle, and the passenger saddle comes off afterward with a lever, no second lock involved

## Mismatched locks and bent keys

Small sport bikes get dropped and repaired. An ignition switch swapped after a crash will no longer match the tank cap and saddle, and a key can be bent in a fall.

A mismatched set can be brought back to one key by setting the odd lock to match the others. A bent key should be replaced, not straightened and trusted, because a blade that snaps inside the ignition turns a small job into a bigger one.

## Replacing a lost RS or RS4 key

Since no electronics are involved, the work is all at the locks. We check photo ID and your registration or title, make a key from the bike's locks, and try it in the ignition, the steering lock position, the tank cap and the saddle lock before handing it over.

Some small-displacement bikes are sold on a bill of sale without a current registration. If that is your situation, tell us what paperwork you do have before we set out, because proof of ownership comes first on every job.

## Where to find the key code

The RS and RS4 owner's books list the keys supplied but do not describe a key code tag. Check the original sales folder in case the selling dealer noted a number. In most cases the key is made directly from the locks on the bike.

## What to have ready

**Have this ready when you call or text**

- Year, make and model of the bike
- Where the bike is parked
- Whether you have any working key, a broken key or a key code
- Photo ID and registration or title (we verify ownership before making a key)

## Aprilia RS 50, RS 125 and RS4 key FAQ

### Does an Aprilia RS 125 have an immobilizer?

The RS 125 use and maintenance book describes two plain keys and has no immobilizer section. A correctly cut key starts the bike.

### Is the RS4 50 key programmed to the bike like on an RS 660?

No. The RS4 50 owner's manual describes a key that works the ignition and steering lock, the fuel tank cap lock and the saddle lock, with no coded key or user code. The RS 660 is a different system.

### My RS 50 has one key for the ignition and another for the tank. Can that be fixed?

Yes. From the factory one key did everything, so a second key means a lock was changed at some point. We can usually match the locks to a single key during one visit.

### I locked my only key under the RS 125 saddle. What now?

Aprilia's manual warns about exactly that. We can open the saddle lock without damage and cut you a spare while we are there.

## More Aprilia models

[Caponord 1200 and ETV 1000](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/caponord-1200-etv-1000/), [Mana 850 and Mana 850 GT](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/mana-850/), [RS 457](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/rs-457/), [RS 660, Tuono 660 and Tuareg 660](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/rs-660-tuono-660-tuareg-660/), [RST Futura and SL 1000 Falco](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/futura-falco/), [RSV Mille and RSV 1000 R](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/rsv-mille-rsv-1000-r/), [RSV4 and Tuono V4](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/rsv4-tuono-v4/), [Scarabeo and SR 50 Scooters](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/scarabeo-sr-50/), [Shiver and Dorsoduro](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/shiver-dorsoduro/), [SportCity scooters](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/sportcity/), [All Aprilia keys](https://themotorcyclelocksmith.com/san-diego/makes/aprilia/)

## Services for this bike

- [Lost Motorcycle Key, No Spare](https://themotorcyclelocksmith.com/san-diego/services/lost-motorcycle-key/): No key at all? We make a working key at the bike.
- [Motorcycle Key Replacement](https://themotorcyclelocksmith.com/san-diego/services/motorcycle-key-replacement/): New keys cut by code or from the lock, for all major makes.
- [Transponder and Immobilizer Key Programming](https://themotorcyclelocksmith.com/san-diego/services/motorcycle-key-programming/): Chip keys and fobs programmed to your immobilizer.
- [Motorcycle Key Duplication and Spare Keys](https://themotorcyclelocksmith.com/san-diego/services/motorcycle-key-duplication/): A spare now costs far less than a lost only-key later.
- [Motorcycle Ignition Repair and Replacement](https://themotorcyclelocksmith.com/san-diego/services/motorcycle-ignition-repair/): Sticking, worn or damaged ignitions repaired or replaced.
- [Broken Motorcycle Key Extraction](https://themotorcyclelocksmith.com/san-diego/services/broken-key-extraction/): Snapped key removed and a new one cut from the pieces.
- [Gas Cap, Seat, Steering and Saddlebag Locks](https://themotorcyclelocksmith.com/san-diego/services/motorcycle-lock-repair/): Gas cap, seat, steering, helmet and saddlebag locks.

## Related guides

- [Locked Your Keys Under the Motorcycle or Scooter Seat?](https://themotorcyclelocksmith.com/san-diego/guides/locked-keys-under-motorcycle-or-scooter-seat/): Keys get locked under the seat because most seats latch shut with a push and need no key to close.
- [Mini Motorcycle and Moped Keys: Grom, Monkey, Ruckus](https://themotorcyclelocksmith.com/san-diego/guides/mini-motorcycle-and-moped-keys/): A lost key on a mini motorcycle is usually one of the simpler key jobs.
- [Worn or Bent Motorcycle Key: Signs, Risks and the Right Fix](https://themotorcyclelocksmith.com/san-diego/guides/worn-or-bent-motorcycle-key/): A worn motorcycle key shows up as a key that needs wiggling, works in one lock but not another, or works worse than the spare.
- [One Key for All Your Motorcycle Locks: Keying Alike](https://themotorcyclelocksmith.com/san-diego/guides/one-key-for-all-motorcycle-locks/): A motorcycle that needs different keys for the ignition, fuel cap and seat has almost always had a lock replaced.

## Where we come to you

[San Diego County](https://themotorcyclelocksmith.com/san-diego/service-areas/san-diego-county/), [San Diego](https://themotorcyclelocksmith.com/san-diego/service-areas/san-diego-county/san-diego/), [Chula Vista](https://themotorcyclelocksmith.com/san-diego/service-areas/san-diego-county/chula-vista/), [Oceanside](https://themotorcyclelocksmith.com/san-diego/service-areas/san-diego-county/oceanside/), [Escondido](https://themotorcyclelocksmith.com/san-diego/service-areas/san-diego-county/escondido/), [Carlsbad](https://themotorcyclelocksmith.com/san-diego/service-areas/san-diego-county/carlsbad/), [El Cajon](https://themotorcyclelocksmith.com/san-diego/service-areas/san-diego-county/el-cajon/), [All service areas](https://themotorcyclelocksmith.com/san-diego/service-areas/)