Browse used OEM parts for the Aprilia RS 660 at Sun Coast Cycle Sports. Introduced in 2020, the RS 660 is Aprilia's middleweight sportbike built around a 659cc parallel-twin engine producing 100 horsepower (105 hp from 2025+), housed in an aluminum twin-spar frame where the engine serves as a stressed member. Available in standard and Factory trim, the RS 660 features Aprilia's advanced APRC electronics suite with lean-sensitive rider aids, cornering ABS, and ride-by-wire throttle. Our parts are individually inspected, photographed with unique SKUs, and ship from Florida.
RS 660 generation and parts compatibility
| Model | Years | Engine | Key notes |
|---|
| RS 660 | 2021-2024 | 659cc parallel twin, ~100 hp | Standard model, Kayaba USD forks, Marelli 11MP ECU, 169 kg dry |
| RS 660 Factory | 2022+ | 659cc parallel twin, ~100 hp | Ohlins NIX30 forks, Ohlins TTX rear shock, forged wheels |
| RS 660 (updated) | 2025+ | 659cc parallel twin, ~105 hp | Larger throttle bodies, winglets, revised electronics, 5 hp increase |
The RS 660 shares its 659cc parallel-twin engine platform with the Aprilia Tuono 660 naked bike. Engine, frame, swingarm, brakes, wheels, and most electrical components interchange directly between the RS 660 and Tuono 660. The primary differences are bodywork (full fairing vs. naked), riding position (clip-ons vs. handlebars), and ECU mapping. This shared platform is completely new to Aprilia and does NOT share any components with the older V-twin models (Shiver, Dorsoduro, RSV, Tuono V-twin) or the V4 models (RSV4, Tuono V4).
The RS 660's engine uses a 270-degree crankpin configuration to deliver a firing order that mimics a V-twin's uneven pulse. The aluminum twin-spar frame uses the engine as a fully stressed member, with the swingarm pivot located in the engine cases. This means engine removal requires separating the frame halves, and frame or swingarm service is more involved than on a traditional cradle-frame motorcycle.
Common RS 660 failure points and replacement parts
Connecting rod failure (early production, NHTSA recall): In 2021, Aprilia issued a recall for early RS 660 and Tuono 660 models due to faulty connecting rods that could lead to catastrophic engine failure. Aprilia replaced affected engines free of charge. Later production bikes (generally 2022+) are not affected. When purchasing a used RS 660, verify whether the VIN falls within the recall range and confirm the engine replacement was performed if applicable.
Quickshifter lever slipping off splined shaft: Multiple owners report the gear shift lever sliding off its splined mounting shaft, sometimes causing the quickshifter body to contact and gouge the frame. Aprilia has provided replacement levers under warranty, and owners recommend applying thread lock to the retaining bolt as a preventive measure.
Oil leak concerns (early models): Some early-production RS 660s exhibited oil leaks from various gasket surfaces. This appears to be concentrated in early builds and may be related to factory assembly quality control. Later production bikes show significantly fewer reports of this issue.
Rear brake squeal: A persistent rear brake squeal is documented across many RS 660 and Tuono 660 examples. While not a safety issue, it is an annoyance that various pad compounds and bedding procedures may or may not resolve.
Rear shock performance: The standard Kayaba rear shock is considered adequate but is the most commonly criticized component on the RS 660. Many owners upgrade to an aftermarket unit for improved handling, particularly for track use.
Commonly replaced RS 660 parts
- Fairings and bodywork panels
- Windscreen
- Brake pads and rotors (Brembo)
- Rear shock absorber (common upgrade)
- Exhaust system (Akrapovic popular aftermarket)
- Shift lever and quickshifter assembly
- Mirrors, levers, and controls
- Chain and sprocket set
Frequently asked questions
Q: Will Tuono 660 parts fit an RS 660
Yes, for engine, frame, swingarm, brakes, wheels, and most electrical components. The RS 660 and Tuono 660 share the same 659cc parallel-twin platform. The differences are limited to bodywork (full sport fairing vs. naked), handlebars (clip-ons vs. flat bars), subframe/tail section, and ECU mapping. A Tuono 660 is an excellent parts donor for an RS 660 and vice versa for all mechanical components.
Q: Does the RS 660 share anything with the RSV4 or Tuono V4
No mechanical components are shared between the 660 parallel-twin platform and the V4 models. The RS 660 uses a 659cc DOHC parallel twin, while the RSV4 and Tuono V4 use a 1,099cc 65-degree V4. Frames, engines, electronics, and bodywork are completely different. Some generic hardware like brake pad shapes or lever designs may overlap, but these are separate motorcycle platforms.
Q: Was the RS 660 engine recall resolved
Yes. Aprilia replaced engines on all affected early-production RS 660 and Tuono 660 models under a formal recall program. The issue involved faulty connecting rods that could fail under load. If purchasing a used RS 660, check the VIN against the recall database and confirm the engine was replaced if the bike falls within the affected production range. Later production bikes (generally 2022 model year onward) were manufactured with corrected connecting rods.
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