Naraku Sport Variator For Italjet Velocifero 50 - NK900.92

The Naraku Sport Variator for the Italjet Velocifero 50 is designed to improve the performance of ...

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GhostBikes.comNaraku Gray Nk900.92 - Sport Variator For Italjet Velocifero 50 1993-1999
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Product Information

Full details

The Naraku Sport Variator (NK900.92) is designed for Italjet Velocifero 50 owners looking to enhance their scooter's transmission efficiency and acceleration. This performance-oriented kit provides a smoother power delivery and improved top-end speed by replacing the stock variator components, though it requires precise tuning of roller weights to match specific engine modifications for optimal results.

All features

Model Part NumberNK900.92
BrandNaraku

Extended Product Information

FAQs

What size are the roller weights included in this kit?

The kit includes 16x13mm rollers weighing 8g each.

Do I need special tools to install this variator?

Yes, you will need a variator holding tool to safely remove and tighten the crankshaft nut.

Is this variator compatible with a stock engine?

Yes, it is compatible with a stock Italjet Velocifero 50 and will improve the transmission shift quality.

How often should I inspect the variator?

It is best practice to inspect the variator rollers and tracks every time you perform a transmission belt service.

Can I use different weight rollers in the Naraku variator?

Yes, as long as they are 16x13mm, you can swap the weights to tune the transmission for your specific riding style.

Troubleshooting

Engine revs high but scooter moves slowly

Check that the variator weights are seated correctly in their tracks and that the belt is not sitting too low in the rear pulley.

Increased vibration after installation

Ensure the variator nut is torqued to specification and that the bushing is correctly centered on the crankshaft.

Top speed lower than expected

The 8g weights may be too light for your current engine setup; try a slightly heavier weight to lower the engine rpm at cruising speed.

Pros and Cons

Pros

  • Improved acceleration from a standing start
  • Optimized shift curve for better power delivery
  • Comprehensive kit includes all necessary hardware
  • High-quality material construction for longevity

Cons

  • May require fine-tuning with different roller weights if engine is modified
  • Requires mechanical knowledge for proper transmission installation
  • Performance gains depend on the condition of the existing belt

Setup, Compatibility & Care

To install, remove the transmission cover and the outer variator nut. Replace the stock variator assembly with the Naraku kit, ensuring the new bushing is lightly lubricated with high-temperature grease. Tighten the crankshaft nut to manufacturer specifications using a variator holding tool.

Compatibility is exclusive to the Italjet Velocifero 50 transmission. For care, it is recommended to inspect the variator during routine belt changes. Wipe away excess belt dust, check the roller tracks for flat spots, and re-apply a thin film of high-temperature grease to the bushing if needed. Replace the 16x13mm weights if they show signs of uneven wear to maintain smooth shifting.

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