Secondary gears Top Racing 15/39-52 – Minarelli Horizontal / Vertical

Quality secondary gear set Top Racing 15/39-52 from manufacturer Jasil is intended for scooters with Minarelli Horizontal and Minarelli Vertical 2T engines.

The longer gear ratio is suitable primarily for more powerful tuning configurations, where the engine has enough power to take advantage of the longer gearing. It enables a potentially higher top speed and better utilisation of the power of a tuned engine.

Technical specifications

• Manufacturer: Jasil / Top Racing
• Type: secondary gears
• Ratio: 15/39-52
• Version: longer / tuning gearing
• For 50cc 2T scooter engines
• Robust design for higher loads

Suitable for

• Minarelli Horizontal 2T
• Minarelli Vertical 2T
• various 50cc scooters with the corresponding Minarelli engine

Advantages of longer gearing

Longer secondary gears are recommended primarily for tuned engines that have enough power for a higher gear ratio. With a properly adjusted engine, they can provide:

• higher top speed
• better utilisation of a more powerful cylinder
• lower RPM at the same speed
• reliable power transmission in sport configurations

On a standard or underpowered engine, longer gearing can reduce acceleration, as the engine does not have enough power to effectively use the longer ratio.

Installation note

Installation of secondary gears requires appropriate servicing knowledge and tools. Before installation, it is necessary to check the version of the existing gearbox, gears and compatibility of the gearing with the engine.

We recommend use primarily with 70cc and more powerful tuning configurations, where the standard gear ratio already limits the top speed.