Required parts

 - Piaggio rear pulley. Warning, not all pulleys will fit on an Minarelli engine. The one I used is from an Piaggio ZIP SP 1998

 - Oversize variator

 - Longer belt (eg.: Malossi OverRange or Polini Evo toothed belt)

 - Distancer for the clutch bell

 - Piaggio spring

 - Minarelli clutch and clutch bell.

 -Grinding machine

Piaggio vs. Minarelli pulley

Notice the size differnce. The Piaggio pulley has a diameter of 128mm, the Minarelli 115mm.

Machining the carters

How much to machine the carters depend on the type of engine. The Minarelli horizontal machine is slightly larger than the vertical (on this article), so less machining may be required. The belt usually vibrates 3-5mm up and down, so check where it could touch the carter.

Under the pulley...

...on the gearbox carter...

...and over the pulley.

The transmission cover may need some machining too.

Fitting

Just assemble it the same way as the original pulley.The Minarelli clutch should fit. The only difference is the distancer that comes on the shaft between the pulley and the clutch bell. I recommend to get done a set of distancers of different thickness in a workshop, so you can find out the most suitable. The measures are D=20 mm, d=12,5 mm. Thickness of 2,5 and 3 mm.

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