Malossi Primary Gear Set Z 14/42 – longer gear ratio for Aerox/Nitro 50 2T

When you increase the power of your 2T engine through machining or the installation of a tuning cylinder, it can often convert this plus into more top speed – unfortunately, the original final gear ratio often holds it back. The stock ratio is usually chosen so that the original engine can "pull" it without problems. However, as soon as more HP is available, the engine quickly spins "dead" at higher speeds: the RPMs increase sharply, while the top speed hardly increases.

This is exactly where the Malossi primary gear set (kit, third holder) Z 14/42 comes in: the gears and intermediate shafts are not only processed to a first-class standard, they also help you bring the final RPMs to a bearable level and let the top speed increase noticeably. Ideal if you want to technically align your Yamaha Aerox 50 or MBK Nitro 50 sensibly to the additional power.

And don't worry about the well-known urban myths ("With a longer gear ratio, it won't move anymore"): in practice, minimally harder clutch springs are usually sufficient to compensate for this. On the contrary – if the gearbox is too short for the available horsepower, you actually waste valuable power because the engine could actually pull significantly more. With this Malossi primary set, you get much more out of the potential of your Aerox 50 / Nitro 50.

Advantages & Features

• Longer primary gear ratio for more usable top speed
• Reduces high final RPMs (engine does not spin unnecessarily "dead" at speed)
• First-class processing of gears and intermediate shafts
• Kit with third holder (as specified in the product name)
• Practical tip: starting behavior can usually be balanced with slightly harder clutch springs

Technical Details

• Version: Gear set / Primary Kit
• Ratio: Z 14/42
• Variant: third holder
• Manufacturer/Reference: Malossi
• Part number: M6714733
• OEM/Reference number: 6714733

Compatibility

Fits many vehicles, such as the Yamaha Aerox 50 and MBK Nitro 50 (incl. certain model years/variants), but also other Aerox/Nitro versions according to the list.

• MBK Nitro 50 (from year 1999)
• MBK Nitro 50 (until year 1999)
• MBK Nitro 50 Cat (from year 2003)
• MBK Nitro Naked 50
• Yamaha Aerox 50 (from year 1999)
• Yamaha Aerox 50 (until year 1999)
• Yamaha Aerox 50 Cat (from year 2003)

Why Malossi?

Malossi transmissions rely on high-quality gears made of identical material or hardness – this ensures long durability and a reliable solution if you want to cleanly gear your Yamaha Aerox 50 or MBK Nitro 50 for more power.

Malossi Primary Gear Set Z 14/42 (kit with third holder) for longer gear ratio: reduces high final RPMs and enables more top speed for tuned 2T engines. High-quality gears for long durability. OEM/Ref.: 6714733.