Twin-PX: the Vespa with the double heart

Created by Ralf Jodl at 16:02 on February 13, 2020

Since Christian from Motorino Diavolo was always bothered by the asymmetry and uneven weight distribution of the Vespa PX and he thinks that the space on the left is wasted for the spare wheel, he decided one fine day that action had to be taken. After going through various arrangement concepts for the second cylinder, a PX80 was procured for the conversion.

Work on the engine began with extensive drawings, milling programmes were made and kilos of swarf produced to assemble the whole thing and fit it into the frame. It continued with a bare frame and donor parts from all friends. The debris slowly became a PX with enough space for the engine. In the meantime, Christian came up with the idea that two cylinders would also go well with two brakes. So back to the PC and designed a double disc brake for the Vespa PX. Off to the milling machine, another mountain of shavings later, the whole thing was already taking shape. In addition to the normal working days, Christian worked night after night on the PX.

Die Kraft der zwei Herzen: 2 x Quattrini M244 in einer Vespa PX...

The target date for presenting the project at the SIP Open Day on 5 May 2019 was unfortunately not possible, so it was to be the Tacho Karacho race in July. Between the SIP Open Day and Tacho Karacho, Christian worked flat out on the project: the result was launched for the first time on Thursday evening before the Tacho Karacho - and after one lap it was already over. On Friday, Christian got spare parts at short notice, and after a day of turning and milling (yes, chips again) and redesigning, a solution emerged that will hopefully now hold.

Endlich eine ausgewogene Gewichtsverteilung: 2 x PX Motor in einem Fahrzeug

On the SIP Tacho Karacho Christian's Twin PX with 2 engines did its first laps, a crazy project that only the Vespa scene can produce!

Project data:

  • Vespa PX Lusso built in 1985
  • 2x racing cylinder Quattrini M244
  • 2x crankshaft SIP PERFORMANCE, stroke 60mm, conrod 127mm
  • Motorino Diavolo sequential gearshift detent
  • Connecting shaft with vibration damping Rotax clutch
  • Machined crankcase half for left side
  • PX-Lusso fork turned and shortened
  • Tyres: 100/90 front and rear on Cosa rim
  • Motorino Diavolo double disc brake with radially bolted four-piston calipers and Galfer Wave brake discs
  • SIP digital speedo / rev counter
  • SIP sports seat
  • Three-chamber box exhaust system self-built
Ralf Jodl
Ralf Jodl

Ralf is managing director and co-founder of SIP Scootershop. He has been riding Vespa since 1990 and even today the working day starts best for him when he rides to the SIP headquarters in Landsberg on his Rally 200. Otherwise he owns a 180 SS, a 160 GS and a VM2 fenderlight Vespa.