The following models are encompassed by this manual: YSR50 / Yamaha Motor Corporation, Ltd
1987 Yamaha YSR50
1988 Yamaha YSR50
1989 Yamaha YSR50
1990 Yamaha YSR50
1991 Yamaha YSR50
1992 Yamaha YSR50
Production year(s): 87, 88, 89, 90, 91, 92, 1987, 1988, 1989, 1990, 1991, 1992
Engine: 49.3 cc (3.01 cu in), two-stroke, air-cooled, single7.4:1.
Manual Language: English
Number of pages: 230+
Printable: Yes (with all printers)
Payment: PayPal or credit card.
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"Maintenance Made Easy: The Comprehensive Troubleshooting and Care Manual for the Yamaha YSR50"
Embarking on the journey of Yamaha YSR50 ownership requires an arsenal of knowledge on maintaining and troubleshooting these unique mini motorcycles. The YSR50, produced from 1987 to 1992, is a compact and exciting ride, but understanding its technical intricacies and engine specifications is key to maximizing its potential and longevity.
Engine Specs and Technical Specifications:
• The 1987-1992 Yamaha YSR50 is powered by a 49cc, two-stroke, air-cooled engine.
• The engine operates with a single cylinder.
• It employs a Mikuni VM16 carburetor for optimal fuel and air mixture.
• The YSR50 features a 6-speed constant mesh transmission.
• The motorcycle showcases a chain drive for transferring power from the engine to the wheels.
• The bore and stroke of this engine are 40.3mm and 39.2mm respectively.
• The engine provides a compression ratio of 7.2:1, which balances power and efficiency.
• It features an auto-lube oil injection system.
• The YSR50 is equipped with a CDI ignition for reliable starting and engine performance.
• This bike utilizes telescopic forks for the front suspension.
• The rear suspension system consists of a swingarm design.
• The YSR50 is fitted with 155mm drum brakes at both the front and rear.
• The vehicle comes with a 3.4-liter fuel tank.
• It also possesses a multi-reflector headlight for enhanced visibility.
• The YSR50 has a wheelbase of 1075mm, contributing to its compact and maneuverable design.
• With a dry weight of only 71kg, this mini motorcycle is easy to handle.
• The seat height stands at a manageable 705mm.
• It's equipped with a two-piece seat, allowing for a passenger.
• This model features a tachometer and speedometer on its instrument panel.
• The engine's lubrication system uses a separate oil pump.
• The bike employs a wet, multi-plate clutch.
• It features a 3.00-12 4PR front tire and a 130/70-12 4PR rear tire.
• The bike comes standard with a kick-start mechanism.
• The frame of the YSR50 is a steel tube backbone.
• The bike features a unique race replica fairing, mirroring Yamaha's larger sportbikes.
Facts and Details:
- The Yamaha YSR50 is also known as a "pocketbike" or "minibike" due to its small size.
- Despite its size, the YSR50 is street-legal in many jurisdictions.
- It's a popular choice among young riders learning to ride, as well as adults seeking a unique and fun bike.
- The YSR50 is often used for mini-moto racing, thanks to its sporty design and capable performance.
- With the right tuning, the YSR50 can reach speeds of up to 55mph.
- It was available in several colorful race-replica designs, imitating Yamaha's larger racing bikes.
- Despite not being produced for many years, a passionate community of YSR50 owners exists, and the bike's popularity endures.
Maintenance Intervals, General Maintenance Tips, Common Issues, and Solutions:
Routine maintenance for the Yamaha YSR50 includes oil changes every 1,000 miles and a thorough check of the braking and transmission system every 2,000 miles. It's also advised to clean the air filter and spark plugs regularly.
A common issue with the YSR50 is the clogging of the carburetor, especially if the bike has been stored for a long period. Regular cleaning and using a good fuel additive can prevent this problem. Another potential issue is the failure of the oil injection system, which can cause the engine to seize. Regular inspection of the oil pump and using good quality two-stroke oil can help avoid this problem.
Popular Tuning Tips/Modifications:
- Upgrade the exhaust: A performance exhaust can increase power and torque.
- Jet the carburetor: Upgrading the jet size can help maximize power.
- Opt for high-performance tires: This can improve handling and stability.
- Modify the sprocket: A larger rear sprocket can increase acceleration, while a smaller one can increase top speed.
- Install performance air filters: This can enhance the air intake and consequently, the engine's performance.
Available Accessories and Aftermarket Options:
- Custom Fairings: These can enhance the bike's looks and aerodynamics.
- Performance Exhaust Systems: For improved sound and performance.
- Upgraded Suspension: This can enhance ride comfort and handling.
- High-Performance Tires: For better grip and stability.
- Custom Seats: To improve comfort or add a personal touch.
- Custom Paint Jobs: To make your YSR50 truly unique.
Owner Reviews and Opinions:
Owners often appreciate the Yamaha YSR50 for its fun factor and ease of handling. The bike is praised for its looks, which mimic larger sport bikes. Some common critiques include a lack of power and a somewhat cramped riding position for taller riders. However, its small size, ease of modification, and unique design make it a popular choice among enthusiasts.
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