YAMAHA 1YU-1YU00 Razz Scooter Riva Engine Motor 1987-UP 49CC IYU00 50CC

( Manufacturer Part Number: 1YU-1YU00 ), ( Part Type: Engine Motor ), ( Machine Type: Scooter ), ( Color: Silver ), ( Compatible Model: Razz, Riva, Mint, Sh50 ), ( Material: Aluminum, Steel ), ( Vintage Part: Yes ), ( Placement On Vehicle: Rear ), ( California Prop 65 Warning: Yes It Is Made Of Metal And Aluminum ), ( Universal Fitment: No ), ( Compatible Year: 1999, 1998, 1997, 1996, 1995, 1994, 1993, 1992, 1991, 1990, 1989, 1988, 1987 ), ( Country Of Origin: Japan )

Review YAMAHA 1987 Up Razz 49cc 50cc Scooter Riva Mint Engine Motor fits MOPED SH50

The **Yamaha 1YU-1YU00 (1987 and up) Razz SH50/49cc IYU00 50cc scooter**, powered by the legendary **Riva engine**, is a compact yet spirited two-wheeler that effortlessly blends retro charm with modern practicality. This scooter was designed with urban commuters and casual riders in mind, offering a lightweight yet robust platform that makes navigation through city streets, suburban roads, and light off-road trails both effortless and enjoyable. The **Riva engine**, a Yamaha-developed powerplant known for its reliability and smooth operation, delivers a balanced performance with a **49cc or 50cc displacement**, producing just enough torque to propel the scooter forward with minimal effort while maintaining a manageable noise level. Whether cruising along a bustling boulevard or weaving through narrow alleys, the Razz SH50 s compact dimensions including a **tight turning radius** ensure it fits seamlessly into tight spaces, making it an ideal choice for riders who value convenience without sacrificing style.

The scooter s **classic yet functional design** is a standout feature, with a **sleek, aerodynamic body** that pays homage to Yamaha s mid-century engineering aesthetics while incorporating modern ergonomics. The **steel frame** provides durability and stability, while the **foldable handlebars** and **removable seat** enhance portability, allowing riders to easily stow the scooter in a garage, car trunk, or even on public transportation. The **single-cylinder, air-cooled engine** is paired with a **5-speed transmission**, offering smooth, precise gear shifts that adapt to various riding conditions whether accelerating from a stoplight or cruising at a leisurely pace. The **mechanical clutch** ensures effortless engagement, while the **chain-driven rear wheel** delivers reliable power transfer without the complexity of a belt drive.

Comfort and convenience are prioritized in the Razz SH50 s design, with a **low step-through frame** that allows riders of all heights to mount and dismount with ease. The **adjustable seat** and **ergonomic footpegs** provide a comfortable riding position, reducing fatigue during longer journeys. The scooter s **small fuel tank**, typically holding around **3.5 liters (0.9 gallons)**, offers a practical balance between range and maneuverability, though riders can expect a **moderate cruising range of approximately 100 150 kilometers (60 90 miles) per tank**, depending on riding style and terrain. The **simple yet effective lighting system**, featuring a **single headlight and taillight**, ensures visibility without unnecessary complexity, while the **basic instrumentation** often including a speedometer and fuel gauge keeps essential information at a glance.

Maintenance and longevity are hallmarks of the Yamaha Razz SH50, as the scooter was engineered with **durability and ease of upkeep** in mind. The **Riva engine** is renowned for its **reliability and low maintenance requirements**, often lasting well beyond its expected lifespan with proper care. The **air-cooled design** eliminates the need for a radiator or coolant system, reducing potential points of failure, while the **simple carburetion** ensures that tuning and adjustments remain straightforward. The scooter s **mechanical components**, including the **chain, clutch, and brakes**, are designed for durability and can be serviced with basic tools, making it an attractive option for riders who appreciate hands-on maintenance or those who prefer a low-cost, low-complexity machine.

Beyond its practicality, the Yamaha Razz SH50 carries a **vintage-inspired appeal** that makes it a standout choice for enthusiasts who appreciate classic scooter aesthetics. Its **clean, uncluttered lines**, **chrome accents**, and **minimalist instrumentation** evoke a sense of nostalgia while remaining functional for modern use. Whether used as a **daily commuter, a weekend cruiser, or a quirky addition to a collection**, this scooter effortlessly bridges the gap between past and present, offering a **timeless blend of simplicity, performance, and style**. With its **lightweight frame, efficient engine, and intuitive controls**, the Razz SH50 is more than just a mode of transportation it s a **versatile, reliable companion** for riders who seek both utility and charm in equal measure.

### **Pros and Cons of Buying a Yamaha 1YU-1YU00 (1987 Up) Razz SH50 (49cc/IYU00 50cc) Scooter with Riva Engine**

---

### **Pros**

1. **Reliability and Durability**

The Yamaha Razz SH50 (and its 50cc variant, IYU00) is known for its robust construction, particularly with the Riva engine a modified version of the original Yamaha 49cc/50cc engine. The Riva engine is often praised for its longevity, especially when properly maintained. Many of these scooters have lasted well beyond 20,000 miles with basic upkeep.

2. **Simplicity and Ease of Maintenance**

The engine and drivetrain are straightforward, making repairs and maintenance accessible even for inexperienced riders. Common issues like carburetor adjustments, chain tension, and spark plug replacements are relatively easy to handle. The lack of complex electronics (unlike modern scooters) reduces potential failure points.

3. **Fuel Efficiency**

The 49cc/50cc engine is highly efficient, typically consuming around **1.5 2.0 liters per 100 km (60 80 mpg)**. This makes it ideal for short commutes or urban riding where fuel costs add up quickly.

4. **Low Operating Costs**

Beyond fuel, maintenance costs are minimal. Parts like chains, sprockets, and carburetors are inexpensive and widely available. The scooter s simplicity also means fewer unexpected repairs compared to modern, electronically controlled scooters.

5. **Lightweight and Maneuverable**

Weighing around **60 70 kg (130 150 lbs)**, the Razz is easy to handle, park, and transport. Its small size makes it perfect for navigating tight city streets, parking lots, and congested areas.

6. **Resale Value and Community Support**

Due to its popularity, parts and used examples are still readily available. There is a strong community of enthusiasts who share knowledge, modifications, and restoration tips, making it easier to keep the scooter running smoothly.

7. **Off-Road and Adventure Potential**

The Razz s lightweight frame and simple suspension allow it to handle light off-road conditions better than many modern scooters. With minor modifications (like wider tires or a longer chain), it can be used for trail riding or rural commuting.

8. **Customization Options**

- **Engine upgrades** (e.g., larger carburetors, porting, or even Riva s own performance kits).

- **Suspension tweaks** for a firmer ride.

- **Aesthetic changes** (paint, fairings, or aftermarket parts).

This makes it a great platform for DIY riders who enjoy personalizing their vehicles.

9. **No Registration or Licensing Issues (in some regions)**

In many countries, 50cc scooters (or those under 50cc) are classified as mopeds and do not require a full motorcycle license. This can be a significant advantage for younger riders or those who prefer not to deal with motorcycle licensing.

10. **Weather Resistance**

The scooter s simple design (no complex electronics) means it can often be ridden in light rain without immediate issues, though prolonged exposure to water can still cause problems over time.

---

### **Cons**

1. **Outdated Safety Features**

- **ABS (Anti-lock Braking System)** The drum brakes (or basic disc brakes in some models) can be less effective in hard stops, especially in wet conditions.

- **Traction control or stability aids** The scooter is prone to wheelie tendencies at higher speeds or on loose surfaces.

- **Lights and reflectors** Older models may have dim or non-functional lights, requiring upgrades for visibility.

- **No turn signals** Many Razz models lack electrical turn signals, relying on hand signals.

2. **Comfort Limitations**

The seat is often narrow and hard, making long rides uncomfortable. The footpegs and handlebars are also less ergonomic compared to modern scooters, which can lead to fatigue during extended use.

3. **Speed and Performance Restrictions**

The stock 49cc/50cc engine is limited to **around 40 50 km/h (25 30 mph)** legally in many regions. While this is sufficient for urban commuting, it can feel slow on highways or open roads. Even with modifications, the power delivery is not as smooth or powerful as modern 125cc scooters.

4. **Weather Vulnerability**

While the scooter can handle light rain, prolonged exposure to water can damage the electrical components (if any), rust the frame, and wear out the chain and sprockets faster. The lack of a proper windshield or fairings means riders are exposed to wind, rain, and debris.

5. **Resale Depreciation**

As a vintage scooter, the Razz does not hold value well over time. While parts are still available, the scooter is not considered a "collectible," so resale value will likely be low after a few years of ownership.

6. **Noise and Vibration**

The Riva engine (and stock Yamaha engines) can be noisy, especially at higher RPMs. Vibrations from the chain drive and simple suspension can also lead to discomfort over time.

7. **Limited Aftermarket Support**

While there is a dedicated community, the aftermarket for parts and upgrades is not as extensive as for modern scooters (e.g., Honda PCX, Yamaha XMAX). Some specialized components may require sourcing from vintage or European markets.

8. **Legal Restrictions in Some Areas**

- **No night riding** (due to poor lighting).

- **Speed limits** that make the scooter impractical for longer distances.

- **Insurance requirements** that may be more expensive than for larger scooters.

9. **Potential for Rust and Frame Wear**

Older scooters, especially those exposed to moisture, can develop rust in critical areas like the frame, exhaust, or suspension. A thorough inspection is necessary before purchase to avoid hidden repair costs.

10. **No Modern Conveniences**

- **USB charging ports**

- **Digital dashboards**

- **Bluetooth connectivity**

- **Automatic headlights**

are absent, making the riding experience less convenient than modern alternatives.

---

### **Conclusion**

The Yamaha Razz SH50 (1987 and up) with a Riva engine is a **fantastic choice for riders who prioritize simplicity, reliability, and low cost** over modern comforts and performance. It excels in urban environments where fuel efficiency, maneuverability, and ease of maintenance are key. The Riva engine s reputation for durability makes it a great long-term investment for those willing to put in basic maintenance.

However, it is **not ideal for riders seeking speed, modern safety features, or comfort** on longer trips. The lack of ABS, turn signals, and ergonomic design can be significant drawbacks, especially in adverse weather or high-speed situations. Additionally, its vintage nature means it will never match the convenience or power of contemporary scooters.

### **Recommendation**

- You need a **budget-friendly, low-maintenance scooter** for short commutes or city riding.

- You enjoy **DIY maintenance and modifications** and want a project vehicle.

- You prioritize **simplicity and reliability** over modern amenities.

- You plan to **ride mostly in dry conditions** and are okay with basic safety features.

- You want a **lightweight, easy-to-park scooter** that s fun to customize.

- You need **speed, power, or long-distance comfort**.

- You rely on **modern safety features** (ABS, turn signals, good lighting).

- You expect **high resale value** or plan to keep the scooter for many years without maintenance.

- You frequently ride in **rainy or harsh weather** without proper protection.

- You prefer **plug-and-play convenience** (e.g., USB charging, digital displays).

- **For urban commuting:** A **used Honda Cub or Yamaha YBR** (similar simplicity, better ergonomics).

- **For modern features:** A **Yamaha XMAX 125 or Honda PCX 150** (better safety, comfort, and power).

- **For off-road/adventure:** A **used Vespa Primavera or Can-Am Spyder** (more rugged, better suspension).

If you re drawn to the Razz s charm and are prepared for its limitations, it remains one of the best **no-frills, low-cost scooters** available especially with a Riva engine upgrade. Just be sure to **inspect it thoroughly for rust, chain wear, and electrical issues** before purchasing.

Details:

Definitely, the tire should be replaced before driving it very far. Only what is shown in the pictures. Low miles at 2068. Its easier to cut our losses than it is wait for an appointment with them figure out.

The rear wheel has a bend on the left side and tire is bad with weather checking rips. 1987 up Yamaha RAZZ SH50 49cc IYU00 50cc Moped scooter RIVA, MINT engine motor. Nothing extra. This one should be a quick bolt in and go.

In Japan it is known as the Mint. No carburetor. The fan has marks from rubbing the cooling covers. It is the 49cc engine marked 1YU00 1YU, 49cm, chain driven 1 speed with a top around 30mph or 34mph downhill.

If you don't buy this one, pay attention to the others listed that have wires or starters. If it is not pictured, included. No cooling plastic covers are included. This engine looks like it fits 1987 to 1999 SH50, possibly up 2001.

The starter is included and it works. Good compression, ran great.

part #: 1yu1yu00 price

• $229.99

specifications cyclevintagee:

• for models: Sh50, Moped
• for makes: Yamaha
• mpn: 1yu-1yu00
• part type: Engine Motor
• machine type: Scooter
• color: Silver
• compatible model: Razz, Riva, Mint, Sh50
• material: Aluminum, Steel
• vintage part: Yes
• placement on vehicle: Rear
• california prop 65 warning: Yes It Is Made Of Metal And Aluminum
• universal fitment: No
• compatible year: 1999, 1998, 1997, 1996, 1995, 1994, 1993, 1992, 1991, 1990, 1989, 1988, 1987
• country of origin: Japan

returns cyclevintagee:

• policy: No Returns

general cyclevintagee:

• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
• condition: Used

seller cyclevintagee:

• # reviews: 5200
• city: Renton, Washington
• rating: 99.8%

offer cyclevintagee:

• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: March 14, 2026
• sold: 0

payments cyclevintagee:

• wallet: Paypal
• other
• credit card: Discover

shipping cyclevintagee:

• cost: $34.48
• transit: 5-10 Days
• type: Calculated
• carrier: FedEx, USPS
• service: FedEx Ground / FedEx Home Delivery, USPS Ground Advantage
• class: Standard

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