A spacer disc for mounting beneath the Vespa largeframe clutch.

The spacer disc, located behind the clutch, ensures a solid drive train connection between the clutch and crankshaft. This small but essential part also determines the correct clutch height and positioning once assembled.

• Decides the correct distance between the clutch and crankshaft.
• Ensures a solid drive train connection between the clutch and crankshaft.
• Correct height and positioning are essential for clutch operation.

Once the clutch has been tightened onto the crankshaft, the spacer disc is exposed to enormous mechanical force. In a worst case scenario they can fail during operation, which stops the transmission of power through the engine. This means that these items should be checked regularly during maintenance work and always tightened to the correct torque value!

The SIP spacer discs

We have had spacer discs produced, and we insisted on the inclusion of a few extra features. They are laser-etched and this is positioned on the disc so that it should always be visible during instalment. This ensures that the disc has the correct side facing the crankshaft and also the correct side facing the clutch. They are available in different thicknesses, to compensate for different clutch constructional heights, where for example an aftermarket tuning clutch has been fitted. These spacers are very solid in construction, tempered and also possess a nitrated surface finishing.

The best set up – our SIP–TIP:

• Replace the lock-nut with a hex nut. This allows the clutch to be more securely attached.
• Always check and eventually replace the woodruff-keys if necessary.
• Worn pressure plates also require renewal.