Malossi Primary Gear Set HTQ Z 23/64 – longer ratio for your Vespa PX

When you increase the power of your Vespa PX 125 or Vespa PX 150 through machining or the installation of a tuning cylinder, the engine can often convert this power into a higher top speed – unfortunately, the standard final ratio often acts as a brake. The original ratios are chosen so that the standard engine can "pull" them without problems. With more HP, the engine quickly spins "dead" at higher speeds: high RPM, but only a small increase in top speed.

This is exactly where the Malossi primary gear set HTQ Z 23/64 comes in: the gears and intermediate shafts are not only processed to a first-class standard, but they also help you bring the final RPMs to a pleasant level while noticeably increasing the top speed. For a cleanly built Vespa PX 125 or Vespa PX 150, this is one of the most effective measures to ensure that the additional power does not simply evaporate into RPM.

And don't worry about the classic hearsay that a longer ratio makes the scooter "sluggish": in practice, minimally stiffer clutch springs are usually sufficient to compensate for this. On the contrary – if the gearbox is too short for the available horsepower, you are even wasting valuable power because the engine could actually "pull" significantly more.

Advantages & Features

• Longer primary ratio for more actual top speed instead of unnecessarily high RPM
• Relieves the engine at higher speeds (more pleasant final RPMs)
• First-class processing of gears and intermediate shafts
• Ideal in combination with tuning cylinders / machined engine setups
• HTQ quality: high-quality gears made from identical material or hardness grade for long durability

Technical Details

• Manufacturer: Malossi
• Version: Primary HTQ
• Ratio: Z 23/64
• ItemNo: M6716721
• OEM/Reference number: 6716721

Compatibility (Vehicles)

Suitable for the following models (excerpt from the vehicle list – exclusively as specified):

• Vespa Cosa 2 125-200
• Vespa PX 150 2-stroke 1999-2005
• Vespa PX 125 2-stroke
• Vespa PX MY 125 2-stroke 1998
• Vespa PX MY 200 2-stroke 1998
• Vespa PX 125 FL 2007
• Vespa Classic PX 150 E Lusso 1981-1997
• Vespa PX 125 30 Years 2V 4-stroke 2007-2008
• Vespa PX 125 E Lusso 1981

Why Malossi?

Malossi gearboxes stand for high-quality gears made from identical material or hardness grade – this ensures long durability and a reliable basis, especially when your Vespa PX 125 or Vespa PX 150 is intended to perform significantly more through tuning.