The MX-5 Superbike Motor Kit (2000-2007): A Historical Overview

The MX-5 Superbike Motor Kit (2000-2007): A Historical Overview

Introduction

The MX-5 Superbike Motor Kit was an innovative solution for cyclists seeking motorized assistance for their traditional bicycles during the early to mid-2000s. Distributed in the United States by Five Flags MotorBikes until 2007, this compact 33.6cc engine kit transformed standard bicycles into efficient hybrid vehicles. The kit offered riders the flexibility to switch between regular pedaling and motor-assisted cycling with a simple lever adjustment. During its availability, the MX-5 kit stood out in the motorized bicycle market for its balance of power, efficiency, and ease of use, making it a popular choice among commuters and recreational riders of that era.

Technical Specifications

The MX-5 Superbike Motor Kit featured impressive technical specifications that made it a capable addition to compatible bicycles of its time:

• Engine Capacity: 33.6cc two-stroke engine

• Maximum Speed: 25-28 mph (with potential to exceed 30 mph)

• Fuel Tank Capacity: 2 liters

• Operating Range: Up to 100 miles per tank

• Fuel Efficiency: Approximately 240 miles per gallon

• Cooling System: Forced air-cooled with finned cylinder

• Ignition System: Breaker-less electronic ignition

• Fuel Mixture: 50:1 or 25:1 petroil mix

• Clutch Type: Automatic

These specifications made the MX-5 an efficient and practical choice for those seeking motorized assistance during its production run. The engine's design prioritized both performance and reliability, while the impressive fuel economy ensured extended riding periods between refueling stops.

Features and Benefits

The MX-5 Superbike Motor Kit offered several notable features and benefits that set it apart from other motorized bicycle solutions of its time:

Dual-Mode Operation The most significant feature was the ability to switch between motor-assisted and regular pedaling modes with a simple lever operation. This flexibility allowed riders to choose their preferred mode of transportation based on conditions or preference.

Complete Kit Package The kit came fully equipped with all necessary components, including:

• A specially designed gas tank that could be mounted either beneath the seat or on the center tube

• A motorcycle-style throttle that easily mounted to the handlebar grip

• Electronic ignition system for reliable starting

• Automatic clutch system for smooth operation

Low Maintenance Design The breaker-less electronic ignition system significantly reduced maintenance requirements compared to traditional systems of that era. The forced air-cooling system with finned cylinder design ensured reliable temperature management without complex liquid cooling systems.

Compatibility The kit was designed to fit most standard bicycles with:

• A minimum seat pole height of 19 inches

• At least 9 inches of clearance above the highest pedal position

These features combined to create a user-friendly and practical motorized bicycle solution that maintained the original functionality of the bicycle while adding powered assistance when needed.

Performance and Efficiency

The MX-5 Superbike Motor Kit delivered impressive performance metrics that made it an efficient choice for daily commuting or recreational riding during its availability. With a top speed ranging from 25-28 mph (and potentially exceeding 30 mph under optimal conditions), the kit provided ample power for most urban and suburban riding scenarios of that time.

The engine's fuel efficiency was particularly noteworthy, achieving approximately 240 miles per gallon. Combined with the 2-liter fuel tank capacity, riders could expect to cover up to 100 miles on a single tank, making it an economical transportation option. This exceptional range meant fewer refueling stops and lower operating costs compared to traditional motorized vehicles of the era.

The automatic clutch system ensured smooth power delivery and easy operation, making the bike accessible to riders of varying experience levels. The forced air-cooling system effectively managed engine temperature during operation, contributing to consistent performance and engine longevity throughout its production run.

Installation Process

Installing the MX-5 Superbike Motor Kit required some mechanical aptitude but was generally straightforward for those comfortable with basic tools. Here's an overview of the installation process as it was typically performed:

1. Compatibility Check

   • Ensuring the bicycle met the minimum requirements:

     • At least 19 inches of seat pole height

     • 9 inches of clearance above the highest pedal position

2. Preparation

   • Removing any accessories that might interfere with the installation

   • Cleaning the bicycle frame thoroughly

3. Engine Mounting

   • Attaching the engine mount to the bicycle frame

   • Securing the engine to the mount using provided hardware

4. Fuel Tank Installation

   • Choosing between mounting beneath the seat or on the center tube

   • Securing the tank using the provided mounting brackets

5. Throttle and Control Installation

   • Mounting the motorcycle-style throttle on the handlebar

   • Routing and securing the throttle cable

6. Drive System Setup

   • Installing the drive sprocket on the rear wheel

   • Attaching the drive chain and adjusting tension

7. Final Adjustments

   • Checking all connections and mountings for security

   • Adjusting the throttle cable for proper operation

   • Filling the tank with the correct fuel mixture

8. Test Run

   • Starting the engine and testing all functions in a safe area

   • Making any necessary final adjustments

While many enthusiasts could complete the installation themselves, those less confident in their mechanical skills often sought assistance from professionals or experienced individuals during the kit's availability.

Maintenance and Care

Maintaining the MX-5 Superbike Motor Kit was relatively straightforward, thanks to its simplified design and electronic ignition system. Here are the key maintenance considerations that were recommended for users:

Fuel Mixture

• Proper fuel mixing was crucial for engine longevity

• Users were advised to use either a 50:1 or 25:1 petroil mixture ratio

• Fresh fuel and proper two-stroke oil were always recommended

• Periodic cleaning of the fuel tank was suggested to prevent debris accumulation

Regular Checks

• Inspecting all mounting hardware for tightness

• Checking throttle cable operation and adjustment

• Monitoring engine cooling fins for debris or blockage

• Examining drive components for wear

Preventive Maintenance

• Cleaning the air filter regularly

• Checking spark plug condition periodically

• Inspecting fuel lines for signs of wear

• Keeping all moving parts properly lubricated

Following these maintenance guidelines helped ensure reliable operation and extended the life of the motorized bicycle system during its years of availability.

Legal Considerations and Safety

During the period when the MX-5 Superbike Motor Kit was available, users needed to be aware of various legal and safety implications:

Legal Requirements

• Users had to check local regulations regarding motorized bicycles

• Speed limits for motorized bicycles varied by area

• Some regions required registration or licensing

• Insurance requirements for motorized bicycles differed by location

Safety Guidelines

• Wearing appropriate safety gear, including a DOT-approved helmet, was strongly recommended

• Maintaining proper tire pressure for the additional weight and speed was crucial

• Installing and maintaining proper lighting for visibility was advised

• Regular brake system inspection and maintenance was essential

• Following all traffic laws and regulations was mandatory

Operating Precautions

• Users were encouraged to familiarize themselves with the engine controls before riding

• Practicing in a safe area until comfortable with operation was recommended

• Being aware of increased stopping distance at higher speeds was important

• Monitoring engine temperature during extended use was advised

Safety was always emphasized as the primary concern when operating bicycles equipped with the MX-5 kit, and these guidelines helped users enjoy their motorized bicycles responsibly during the product's availability.

Historical Context and Availability

The MX-5 Superbike Motor Kit was distributed in the United States by Five Flags MotorBikes until 2007. The company, which has since gone out of business, was a significant player in the motorized bicycle market during the early to mid-2000s. The kit was sold for $449.00 and gained popularity among cycling enthusiasts looking for an affordable motorized transportation solution.

Five Flags MotorBikes operated through their website and various dealers across the United States, providing not only the kits but also support and replacement parts for their customers. The company's closure around 2007 marked the end of the MX-5 Superbike Motor Kit's commercial availability, though some enthusiasts continued to maintain and operate their converted bicycles for years afterward.

The MX-5 kit represented an important chapter in the history of motorized bicycles, offering a well-engineered solution that balanced power, efficiency, and ease of use. While the product is no longer available new, it demonstrated the potential for small-displacement engines to provide practical motorized assistance for traditional bicycles.

Conclusion

The MX-5 Superbike Motor Kit, during its production run until 2007, represented a well-balanced solution for those seeking to add motorized assistance to their bicycles. With its efficient 33.6cc engine, impressive fuel economy, and user-friendly design, it offered a practical upgrade path for cyclists looking to enhance their riding experience. While it wasn't the most powerful option on the market, its combination of reliability, ease of maintenance, and exceptional range made it a popular choice for daily commuters and recreational riders of that era.

At its original price point of $449.00, the kit provided good value for those seeking a reliable motorized bicycle solution. Though the product is no longer available and Five Flags MotorBikes has ceased operations, the MX-5 Superbike Motor Kit remains a notable example of innovative bicycle motorization from the early 2000s. Its legacy lives on through the many similar kits that followed, though few matched its particular combination of efficiency and practicality.