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- Clutch Nut - Conversion Nut - HEIKOTUNING Ø20mm Axle (external bearing / rolling nut) - Piaggio 125-180 Maxi 2-Stroke
Conversion nut for older Piaggio, Gilera, Aprilia, and Italjet engines with an internally mounted clutch shaft—for use with a variator cover featuring an external bearing.
The HT Rolling Nut is a special conversion nut for older Piaggio and Gilera 125–180 cm³ 2-stroke engines. It allows for the installation of a variator cover with an externally mounted clutch shaft on an older engine block where the clutch shaft is standardly mounted within the engine case and the transmission cover.
The nut replaces the original clutch shaft nut and establishes the connection to the bearing in the externally mounted engine cover. This allows both the HT CNC variator cover and a compatible original Piaggio or Gilera cover of the later externally mounted design to be used on older engines.
HEIKOTUNING Rolling-Nut Conversion M12x1.25 Ø 20 mm External Bearing Piaggio 125–180 2-stroke
On older Piaggio engines, the clutch shaft is guided through the engine case on the variator side and through the transmission cover on the opposite side. Later engines, however, feature an external bearing arrangement: Here, the clutch shaft is positioned between the transmission cover and an additional bearing in the variator cover.
Without modification, the older clutch shaft lacks the proper connection for this external bearing. The HT Rolling Nut performs exactly this function. It is screwed onto the existing thread of the clutch shaft and forms the connection to the Ø 20 mm bearing in the variator cover.
| Design | Clutch Shaft Bearing Arrangement |
|---|---|
| Older engine, original | in the engine block and in the transmission cover |
| Later engine, externally mounted | in the transmission cover and in the variator cover |
| Older engine with HT Rolling Nut | The existing clutch shaft is connected to the bearing of the externally mounted variator cover |
| Manufacturer | HT / Heiko Tuning |
|---|---|
| Manufacturer Part Number | 03611 |
| Part | Clutch Shaft Nut / Conversion Nut |
| Thread | M12x1.25 |
| Outer Bearing | Ø 20 mm |
| Material | High-strength steel |
| Applications | Piaggio, Gilera, Aprilia, and Italjet engines with 125–180 cm³ 2-stroke |
| Function | Conversion of an older clutch shaft for a variator cover with external bearing |
The HT Rolling Nut fits numerous Piaggio 125–180 cm³ 2-stroke engines from the 1990s and early 2000s. The key factors are the specific engine type, the M12x1.25 thread, and the clutch shaft design.
The rolling nut connects the clutch shaft to the outer bearing. However, it does not resolve any installation space-related limitations of the variator cover being used.
Remove the original clutch shaft nut and replace it with the HT Rolling Nut. Then, install the appropriate variator cover with outer bearing. Before final installation, check the alignment of the clutch shaft, the fit in the cover bearing, and the free play of the entire drive train.
The HT Rolling Nut allows for the installation of an externally mounted variator cover on older Piaggio 125–180 cm³ 2-stroke engines. It replaces the stock clutch shaft nut and connects to the Ø 20 mm bearing in the cover. This allows for the use of both the HT CNC engine cover and compatible original externally mounted covers without having to replace the existing clutch shaft.
