Motorcyclist:
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The Supertwin's power comes from the 1064cc, two-valve-per-cylinder motor of the naked V11 Sport, supplied directly by Guzzi. The motor is essentially standard, although Ghezzi & Brian's airbox, plus tweaking of the Weber-Marelli fuel-injection system, adds a bit of low-rev power. The bike also wears a less restrictive exhaust that helps lift peak output. Ghezzi also balances the flywheel to reduce vibration. The Supertwin uses the five-speed gearbox from the California instead of the V11's more modern six-speed box because Guzzi originally refused to supply the new unit.
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WebBikeWorld:
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The 1100cc V-twin engine fuel injection is tweaked to produce 94 horses and gobs of torque.
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Tuon mukaan moottorin sisuskaluihin ei ole puututtu, mutta hengitystä on parannettu ja karttoja optimoitu. En tiennytkään, että käytössä onkin Calin vaihteisto kun eivät antaneet Guzzilta alkuun uutta V11/6 vaihteistoa, myöhemmin olisivat antaneet mutta projekti oli jo liian pitkällä.