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Piaggio Si
Piaggio Si
Piaggio Si
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Piaggio Sì
Piaggio Sì FL2
ManufacturerPiaggio
Also calledPiaggio Si
Production1978-2001
AssemblyPontedera, Italy
PredecessorPiaggio Boxer
ClassMoped
RelatedPiaggio Ciao
Gilera CBA
Gilera CB1

The Piaggio Sì is a moped that was produced by the Italian manufacturer Piaggio.

It received homologation on 20 November 1978 and was presented in Genoa on 1 February 1979.[1]

In the North American market it was sold by the American division of Piaggio, the Vespa of America Corporation, as Piaggio Si.

Description

[edit]

With engine derived from the contemporary Piaggio Ciao, it differed from it for the fork telescopic front, rear monoshock instead of rigid frame, for the headlights front and rear of different design, for the longer saddle, more comfortable and equipped with a small compartment under the saddle, and for the 4-spoke wheels.

As for the engine, it differed only in the cylinder head of different design and with longer cooling fins. Furthermore, there is a version equipped with Variomatic, a solution that allows you to overcome slopes more easily by increasing the reduction ratio of the transmission system.

The models

[edit]

First series (1979-1987)

[edit]

The Sì, on sale in Italy since February 1979, was available with both long saddle and short saddle and spoke or alloy wheels. This model, until about mid-1979 was only available in two colors: Light Gray Metallic 108 and Beige 560. Subsequently, around mid-1979, the Blue Marine color was added. The muffler was square in section. It was available with variator (SIV) and pulley (SIM). The engine had the traditional ignition with points. The brake levers were made of metal and ended in a ball. In April/May 1980 the mud flap was added and from 1981/82 the brake levers became plastic. In 1981 the horn button also changed, which until then had been a gray casing and then became all black. Since 1983, the short saddle and spoked wheels were optional. From 1984 the optional electronic engine was introduced. From 1984/85 the engine cradle was no longer in body color but black/gray.

Sì Montecarlo

[edit]

It differs from the first series for the upside-down and advanced hydraulic fork as in the Piaggio Bravo, and the double rear shock absorber.

Sì Tuttorosso

[edit]

It differs from the Montecarlo in various red painted details.

Sì Ecology System

[edit]

It differs from the first series for the new thermal unit and for the stickers on the side panels. The electronic ignition option was maintained.

Second series "Electronic" or "FL" (1987-1991)

[edit]

This series differed from the previous one only in the fact that it had electronic ignition as standard, the muffler was round and the plastics were painted. The cradle turns black. Under the seat it had "Electronic" on the left and a label with the model name on the right. It was available in SIM and SIV versions. Kick starter was available as an option.

Third series "FL2" (1992-2001)

[edit]

Born to complement (and then replace) the FL series, this model only had a different saddle (more rounded) and some plastic details. The last examples were catalyzed. They were available in the version with points and with electronic ignition, and as optional the direction indicators.

Sì Mix

[edit]

It is an FL2 with automatic mixer. The oil tank is under the saddle. to check the oil level, a small porthole has been placed on the left side where the level can be kept under control. Also equipped with a small buoyancy ball for more accurate control. Two orange reflectors have also been placed on the sides immediately under the saddle.

Sì Miami

[edit]

It is a blue FL2 with specific stickers.

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Piaggio Si

View on Grokipedia
from Grokipedia
The Piaggio Sì (Italian for "yes") is a lightweight produced by the Italian manufacturer , primarily as a sportier evolution of the popular model, with production spanning from 1979 to 2001. Equipped with a single-cylinder, air-cooled 49 cc , pedal start, Dell'Orto , and transmission, it achieves a top speed of 45 km/h while weighing just 51 kg dry. Key design features include a tubular , telescopic front forks with a single rear , 16-inch tires, and drum brakes (103 mm front, 136 mm rear), along with upgrades like alloy wheels and a 4.2-liter fuel tank in later variants. Introduced to appeal to younger riders seeking enhanced comfort and style over the standard , the Sì featured a circular headlight, extended cooling fins, and electronic ignition in the Second Series from 1987 onward, contributing to its enduring popularity in urban settings across .

Background

Origins and Development

The Si moped emerged as the direct successor to the Boxer, a model introduced in 1970 that utilized a simpler rigid frame, drum brakes, and a single-seat configuration in its initial series, which became outdated amid shifting demands for enhanced urban mobility. The Boxer, with its 49.77 cc and high-mounted wheels, represented 's earlier approach to lightweight transport but was phased out by 1983 as the company sought to address limitations in comfort and versatility. Piaggio initiated the internal development project for the Si in the mid-1970s, aiming to update its moped offerings to meet growing European needs for agile, commuter-friendly vehicles suitable for congested city environments. Homologation for the Si was granted on November 20, 1978, marking the culmination of this redesign phase. Drawing key influences from the established platform, the Si retained its predecessor's compact 49.77 cc while prioritizing upgrades for daily commuting, such as expanded under-seat storage and refined . It also shared components with related models from Piaggio's portfolio, including the CBA and CB1 mopeds, particularly in engine and transmission elements, reflecting the company's strategy of across its subsidiaries. The engineering goals centered on delivering superior ride quality compared to the Ciao's basic leading-link front suspension and rigid rear setup, incorporating a telescopic front fork and single rear shock absorber to enhance handling for young urban riders. This evolution embodied a thematic "sì" (yes) to modernity, positioning the Si as an affirmative step toward more practical and stylish personal transport in an era of increasing city-based lifestyles.

Launch and Initial Production

The Piaggio Sì made its public debut at the International Motor Show in early 1979, positioning the model as Piaggio's sophisticated evolution within the segment, building on the success of earlier designs like . This launch highlighted the model's refined aesthetics and improved ride quality, aimed at appealing to urban commuters seeking a blend of practicality and style beyond basic utility vehicles. Production commenced at Piaggio's historic factory in during late 1978, enabling immediate availability following and supporting a manufacturing run that extended through 2001. The facility, Piaggio's primary production hub since the early , assembled the Sì with a focus on efficient assembly lines to meet growing European demand for lightweight, enclosed-engine mopeds. Marketed in under the name Piaggio Sì, the model emphasized its Italian engineering heritage, while in , distribution was handled by the Vespa of America Corporation, branding it simply as the Piaggio Si to capitalize on the 's established reputation for quality scooters. Initial offerings featured a palette of Gray, , and Marine, providing buyers with subtle, versatile options that complemented the moped's clean lines. To accommodate varied user needs, early models incorporated customizable features such as spoke or wheels— the latter being lightweight 4-ray cast aluminum "mag" designs for enhanced durability—and options for long or short saddles, allowing for solo riding comfort or capability. These adaptations underscored Piaggio's attention to rider from the outset, setting the Sì apart in a competitive market.

Design and Engineering

Frame and Suspension

The Piaggio Si features a tubular steel frame designed for lightweight durability and structural integrity, providing a robust yet agile suitable for urban . This construction enhances the moped's overall stability compared to its predecessor, the , with a longer to improve handling and rider confidence on varied road surfaces. The front suspension employs a telescopic hydraulic fork, marking a significant advancement over the rigid or leading-link setups common in earlier mopeds like the Ciao, which allows for smoother absorption of road imperfections. This design contributes to more comfortable and controlled rides in city environments. At the rear, the Si incorporates a monoshock absorber system, an innovative feature for the category during its era, which replaced traditional twin-shock arrangements to optimize weight distribution and enhance maneuverability on urban roads. The is equipped with 16-inch wheels featuring 2.5-inch wide tires, typically fitted with rubber for reliable traction and puncture resistance. Wheel options include standard wire-spoke rims or lightweight 4-spoke alloy "mag" wheels, the latter offering aesthetic appeal and minor weight savings for improved responsiveness. The braking system consists of drum brakes with 103 mm at the front and 136 mm at the rear. The adopts an elongated design to accommodate rider comfort, with variants available in long configurations for two-person use or shorter single-rider versions. An under-seat compartment provides practical storage for tools or small items, enhancing everyday usability without compromising the compact profile.

Engine and Transmission

The Piaggio Si features a 49.9 cc single-cylinder two-stroke derived from the design, incorporating a distinctive and enhanced cooling fins to improve heat dissipation and . The fuel system employs a 50:1 premix oil-to-gasoline ratio for lubrication, with a providing precise metering of the air-fuel mixture; later models offered optional electronic ignition for more reliable starting and performance. This powerplant delivers approximately 1.5 hp at 4,500 rpm, adhering to moped standards with displacement below 50 cc and a governed top speed of 45 km/h (28 mph). Transmission variants include a paired with a single-speed gearbox in SIM models for direct control, or the CVT in SIV models, which uses expanding pulleys and a V-belt for seamless, automatic ratio changes suited to city riding; both systems drive the rear via belt. Subsequent series introduced a round-section to attenuate exhaust noise while maintaining efficient gas flow.

Model Generations

First Series (1978–1987)

The Piaggio Si first series, produced from 1978 to 1987, established the model's core identity as a step up from the simpler , offering enhanced comfort and versatility for urban use. Available in two primary variants—the Variomatic-equipped for automatic shifting and the SIM with a fixed system—these mopeds featured a 49.77 cc two-stroke delivering 1.5 HP at 4,500 RPM, paired with a square-section and basic carbureted fuel system. The frame utilized a tubular steel construction with a telescopic front for improved handling over the Ciao's simpler setup. Early models from emphasized practicality with spoked wheels, basic chrome accents on handlebars and exhaust guards, and minimal black plastics for side panels and fenders. Saddle options included a short solo version with an integrated rear rack for cargo, ideal for single riders in city environments, or a longer two-seater enabling passenger accommodation and under-seat storage. Optional cast aluminum wheels in a four-spoke design were available, reducing weight and enhancing aesthetics without altering the core mechanicals. Color palettes evolved to reflect shifting tastes, starting with subdued anti-rust grays and beige tones on frames and fenders in the initial years, then expanding to brighter options like deep reds and blues by the mid-1980s to appeal to a broader demographic. Positioned for younger European riders and commuters seeking reliable daily transport with enhanced comfort and style over the , initial exports reached to capitalize on growing interest there.

Second Series "Electronic" or "FL" (1987–1991)

The second series of the Piaggio Si, nicknamed "FL" due to updated frame lettering, spanned production from 1987 to 1991 as a mid-cycle refresh focused on enhancing reliability through electronic and aesthetic improvements. A key innovation was the adoption of electronic ignition as standard, supplanting the earlier points system to simplify maintenance by removing the need for regular adjustments and improving cold-start reliability with consistent spark delivery across engine speeds. The featured a new round-section designed for quieter operation, reducing noise levels compared to the prior angular design. Aesthetic updates included the introduction of painted body panels in vibrant colors such as and , offering a more modern and customizable appearance while maintaining the model's lightweight construction. The series retained the proven 49.77 cc core and optional , with refinements to belt tensioning for enhanced durability under prolonged use.

Third Series "FL2" (1992–2001)

The third series of the Piaggio Sì, designated "FL2," represented the final generation of the moped and was produced from 1992 to 2001, evolving the frame design from the preceding FL series to incorporate minor structural refinements for durability and manufacturing efficiency. Key updates focused on rider comfort, including a redesigned saddle that adopted a more rounded and padded profile to improve ergonomics during extended use. Additionally, the series saw increased incorporation of plastic components in bodywork elements, contributing to lighter weight and simplified assembly while maintaining the model's classic aesthetic. In response to increasingly stringent emissions regulations during the 1990s, later FL2 models introduced catalyzed exhaust systems to reduce harmful pollutants, marking a significant step toward environmental compliance in the moped segment. This series retained the monoshock rear suspension configuration from prior generations for consistent handling. To enhance road legality across more international markets, optional direction indicators became available, allowing owners to equip the moped with front and rear turn signals as needed. Toward the end of production in 2001, implemented simplifications such as streamlined plastics and reduced sticker applications, reflecting adaptations to waning demand for traditional mopeds amid the rise of more versatile 50cc scooters.

Special Variants

First Series Editions

The Piaggio Sì Montecarlo edition, introduced in 1979 as part of the first series production, featured enhanced suspension components for improved sportier handling, including a telescopic front and double rear shock absorbers, distinguishing it from the standard model's setup. These modifications contributed to better road stability while maintaining the base 16-inch wheels of the first series. Produced in limited numbers during the 1980s, this variant targeted enthusiasts seeking a more dynamic riding experience within the category. The Sì Tuttorosso edition emphasized a bold racing-inspired aesthetic through its extensive red-painted accents on the frame and plastic body panels, appealing particularly to younger buyers in the urban youth culture of the era. This all-red color scheme transformed the standard first series design into a visually striking option without altering core mechanical specifications. Like other specials, it was a low-volume release, primarily distributed in and select European markets. The Sì Ecology System edition responded to emerging environmental awareness trends in the mid-1980s by incorporating an updated engine with the Ecology System for enhanced . It also included distinctive side panel stickers promoting eco-friendly aspects, aligning with early "green" initiatives in vehicle design. This variant remained true to the first series' compact and lightweight profile, with production confined to small runs, focused on European sales. The Sì Cross edition, introduced in 1979, featured a distinct front fork similar to the CBA for enhanced handling, and could be combined with features from other variants like the Montecarlo.

Third Series Editions

The Third Series editions of the Piaggio Sì, produced as part of the FL2 generation from 1992 to 2001, introduced targeted enhancements in functionality and appearance to appeal to evolving user preferences. These variants built on the core FL2 updates, such as the more rounded for improved rider comfort, while emphasizing convenience and visual flair without altering the fundamental 50 cc or frame . The Sì Mix represented a functional , featuring an automatic oil mixer that simplified by automating the fuel-oil . This edition, launched in 1999, prioritized ease of use for daily commuters by removing the need for manual premixing, a common chore in earlier models. It maintained the FL2's overall specifications, including a dry weight of approximately 52 kg and a 4.2-liter with reserve. In contrast, the Sì Miami was a stylistic based on the FL2 platform, distinguished by blue accents and vibrant, colorful decals for a distinctive tropical-inspired aesthetic. Marketed as a rare variant, it targeted buyers seeking cosmetic differentiation, particularly in export markets, and was produced in limited numbers during the . Beyond these specials, the Third Series included non-edition catalyzed trims introduced in the later production years to comply with emerging emission regulations, offering the same reliable performance with reduced environmental impact. These options rounded out the lineup, providing practical alternatives without the themed enhancements of the Mix or Miami.

Legacy and Reception

Market Impact

The Piaggio Si achieved notable commercial success in throughout its production run from 1978 to 2001, serving as a key model in Piaggio's lineup and contributing to the company's strong position in the 50cc segment. Particularly popular in and , the Si was favored for urban commuting due to its compact design, reliability, and ease of use in congested city environments. Piaggio's overall market share in reached approximately 22% during the late production years, with even higher dominance at 35% in , reflecting the Si's role alongside models like the in sustaining demand for affordable, pedal-assisted mopeds. In , the Si was imported via of America Corporation starting in 1979, capitalizing on the scooter revival and distributed through Vespa dealerships as a stylish alternative to domestic options. However, sales began declining by 1983 amid falling gasoline prices, which reduced the appeal of fuel-efficient , and increasing competition from Japanese four-stroke scooters such as the . The Si represented the sportiest and final Vespa moped imported to the U.S. market, with limited units sold through 1984–1985 before withdrew from the region in the mid-, primarily due to declining sales and the company's decision not to invest in four-stroke alternatives, despite exemptions for 50cc two-stroke mopeds under 1983 EPA emissions regulations. Competitively, the Si distinguished itself in the moped market by blending Italian aesthetics and transmission for smoother acceleration with accessible pricing, outperforming heavier rivals like the Grande while offering advantages over Japanese competitors such as the in terms of style and handling for urban use. This positioning helped maintain a foothold against imports, though broader market shifts toward larger scooters and regulatory pressures contributed to the Si's declining sales in the . Production ceased in 2001 as pivoted toward modern scooter platforms, aligning with evolving consumer preferences and environmental standards in .

Collectibility and Modern Interest

In contemporary markets, well-preserved examples of the first-series Piaggio Si (1979–1987) typically command prices between $1,000 and $3,000 USD, reflecting their status as the original iteration with classic pedal-start mechanisms and minimalist design. Rare special variants, such as the Montecarlo edition, can reach up to $5,000 USD for pristine condition due to their upgraded upside-down hydraulic front forks and double rear shock absorbers, which enhance ride quality over standard models. These values, observed in 2025 enthusiast auctions and online marketplaces, underscore the Si's appeal as an accessible entry into vintage moped collecting. The restoration community remains vibrant, with active online forums like serving as hubs for parts sourcing and technical advice on rebuilding the Si's 2-stroke engine and cantilever suspension. Enthusiasts often undertake custom modifications, particularly transforming the frame into cafe racer styles with aftermarket seats, handlebars, and performance exhausts to blend retro aesthetics with modern usability. Despite challenges in obtaining original 2-stroke components following the end of production in 2001, aftermarket suppliers and community-shared resources mitigate scarcity, while continues to support preservation through reprinted service manuals available via official channels. The Piaggio Si holds iconic status in Italian design history as a symbol of 1980s youth mobility, frequently appearing in period advertisements and films that captured the era's urban lifestyle, such as the TV series "I ragazzi del muretto" (1991–1996) and films like "Provocazione" (1988), featuring mopeds as emblems of freedom. Modern interest has surged in its eco-retro potential, particularly with third-series Ecology System editions equipped with catalytic converters for reduced emissions, appealing to environmentally conscious collectors who value sustainable vintage riding. This blend of cultural nostalgia and green innovation sustains the Si's relevance among hobbyists today.

References

  1. https://www.iconicauctioneers.com/1990-piaggio-si-rec12508-8-shuttle-0723
  2. https://www.museonicolis.com/en/piaggio-si/
  3. https://en.50factory.com/content/13933-data-sheet-piaggio-moped-si-2t
  4. https://dualwheeljourney.com/mopeds/piaggio-ciao-specs-stats/
  5. https://www.myronsmopeds.com/2019/12/vespa-parts/
  6. https://www.museopiaggio.it/en/models/2-piaggio/56-boxer
  7. https://www.quattromania.it/2024/10/11/piaggio-si-levoluzione-del-ciao-che-ha-fatto-impazzire-il-mondo-oggi-costa-davvero-pochissimo/
  8. https://www.polini.com/wp-content/uploads/2023/10/piaggio_ciao_polini.pdf
  9. https://astebolaffi.it/en/auction/153/50
  10. https://www.classicmotorcycle.co.uk/a-to-z-classic-reference-piaggio-piana-3/
  11. https://www.rocketcolors.de/en/pages/vespa-piaggio-farben-lacke-farbtabelle-mit-modellen
  12. https://www.easyparts.com/help/-t73.html
  13. https://www.ebay.com/itm/186437007047
  14. https://www.namyslik.net/app/download/24789131/Vespa-Ciao-Bravo-Si-service-manual.pdf
  15. https://www.dueruote.it/news/moto-scooter/2023/03/01/piaggio-si-storia/
  16. https://autoemotodepoca.altervista.org/piaggio-si-prima-serie-19781987-italia/
  17. https://www.virgilio.it/motori/moto/la-storia-del-si-piaggio-il-motorino-evoluzione-del-ciao/83992/
  18. https://www.mofakult.ch/it/polini-evo-accensione-elettronica-piaggio-ciao-si-bravo-boxer-33758
  19. https://www.racingplanetusa.com/converter-revision-piaggio-bravo-boxer-ciao-models-with-variator-p-229706-1.html
  20. https://www.nextmoto.it/articolo/piaggio-il-modello-che-ha-sostituito-il-ciao-bellezza-senza-tempo/45852/
  21. https://www.moto.it/listino/piaggio/si-50/si-50-mix/YzvwOP
  22. https://wide.piaggiogroup.com/archive/wide2_14/scooter/index_en.html
  23. https://www.borsaitaliana.it/mediasource/star/db/pdf/51935.pdf
  24. https://www.mopedarmy.com/wiki/Vespa_Si
  25. https://www.classic-trader.com/au/motorcycle/search/piaggio/si
  26. https://www.theparking-motorcycle.eu/used-motorcycles/piaggio-si-montecarlo.html
  27. https://www.carandclassic.com/cat/15/802/si/
  28. https://www.mopedarmy.com/forums/read.php?1,4543458
  29. https://www.scooterwest.com/pdf-parts-book-for-all-makes-models-years.html
  30. https://www.imcdb.org/vehicles_make-Piaggio_model-Si.html
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