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Crankcase BFA MOTORI for Vespa

aluminium CNC,
direct intake, cover drive
shaft removeable


Alongside Falc, Quattrini and Co. BSG offer some of the hottest tuning parts available to date. The three letters that make up the company name originate from the surname initials of high-end tuner Fabio Begani, racing legend Stefano Scauri and ET-3 wizard Alessandro Graiani. We could stop explaining right here because these guys don't do things by halves. Quite on the contrary BSG and the BSG supported pilots belong to the premier league of Italian scooter racing. Be it in the VPI (Vespa Pista Italia), the CIA (Campionata Italiano Accelerazione) or the new POLINI Cup. With a stunning performance of 48PS, the BSG smallframes was the most powerful scooter on the dyno at the Customshow in Landsberg 2013. It's clear that special components are required to rein such power.



The CNC engine case forms a solid basis for extreme performances. The guys have been working on this project for years and put the engine case to the test in countless races. By now they are ready to sell it. The engine case is CNC milled from solid material. The enormous crankcase provides enough space for the BSG full circle crankshaft with 90.2mm crankwebs. In order to increase the pre-compaction the cylinder base is equipped with no more than a slot in which the conrod moves. Of course this can also be enlarged. The bearing seats are designed for 52x20x15mm crankshaft bearings. Spacers for the crankshaft bearings are included. In order to achieve maximum performance, the crankshaft has to be exactly aligned.

The engine case comes with a 19.5mm screw-on spacer that allows of extreme transfer ports. Although you can modify the engine case to use a crankshaft intake, we strongly suggest the use of cylinders with direct intake. Suitable for all watercooled cylinders with 54-64mm Ø bore and 54-56mm stroke. e.g.: FALC, QUATTRINI and PARMAKIT. Karting cylinders (such as TM, ROTAX Ø 60mm) and CAGIVA or GILERA racing cylinders are currently used to achieve maximum performance. The engine case comes with a detachable shock mount that allows you to use rigid (drag racing) shock absorbers. Also the swing arm is detachable and provides enough room for 3.50-10 tyres. The gearshift arm is ball bearing mounted.

You can either use a conventional ignition system, or ignitions made by PVL or SELECTRA. Primary bearing, engine studs and other small parts are included in the scope of delivery. All other components can be taken from a PK engine. The engine case requires the use of a BSG crankshaft. The version with detachable cover allows of fast adjustments to the gearbox, while the engine is mounted. This way you stay flexible at 150-400m races.

The BSG crankcases are the most extreme tuning crankcases that we have seen for the Vespa Smallframe motor. They may seem relatively expensive, although if the extensive design and production processes involved are considered, entirely fair. A suitable set of assembly instructions are in the pipeline but regrettably not yet available therefore we recommend that only experienced mechanics accept this invitation into tuning heaven!

Conclusion : Hardly surprising that Stefano Scauri has achieved 48PS with this set up!


SIP-TIP : Do not forget to order suitable oil-seals and gasket material. The BSG produced full-circle crankshaft is essential, the transmission can be set up using the BSG primary drive cogs. A strengthened DRT transmission, BSG drive-shaft and clutch are recommendable. Peripheral components, such as a SIP clutch cover and rubber buffers etc, should also not be forgotten.


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Product forums
icon scootermodels This product fits the following models
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA 50 / N 50 V5A1T 2T AC `63-`71
VESPA 50 L 50 V5A1T 2T AC `66-70
VESPA 50 R 50 V5A1T 2T AC `69-`83
VESPA 50 S 50 V5SA1T 2T AC `63-`84
VESPA 50 Special 50 V5A2T 2T AC '69-'72
VESPA 50 Special 50 V5B1T 2T AC `72-`75
VESPA 50 Special 50 V5B3T 2T AC `75-`83
VESPA 50 Special Elestart 50 V5B4T 2T AC '75-'76
VESPA 50 Special Elestart 50 V5B2T 2T AC `72-`75
VESPA 50 Special Elestart 50 V5A3T 2T AC '69-'72
VESPA 50 SR / Sprinter 50 V5SS2T 2T AC `71-`79
VESPA 50 SS / Super Sprint 50 V5SS1T 2T AC `65-`71
VESPA 90 90 V9A1T 2T AC `63-`84
VESPA 90 Racer 90 V9SS2T 2T AC `71-`74
VESPA 90 SS Super Sprint 90 V9SS1T 2T AC `65-`71
VESPA 100 (UK) / 100 Sport (US) 100 V9B1T 2T AC `78-`90
VESPA 125 125 VMA1T 2T AC `65-`67
VESPA 125 Primavera 125 VMA2T 2T AC `67-`83
VESPA 125 Primavera ET3 125 VMB1T 2T AC `76-`90
VESPA PK 50 50 V5X1T 2T AC `82-`84
VESPA PK 50 S / Elestart 50 V5X2T 2T AC `82-`84
VESPA PK 50 S Lusso / Elestart 50 V5X2T 2T AC `85-`88
VESPA PK 50 SS / Elestart 50 V5S1T 2T AC `83-`86
VESPA PK 50 XL / Elestart 50 V5X3T 2T AC `85-`90
VESPA PK 50 XL FL 50 V5N1T 2T AC `90-
VESPA PK 50 XL HP 50 V5N2T 2T AC `91-`91
VESPA PK 50 XL N NUOVA 50 V5X5T 2T AC `89-`90
VESPA PK 50 XL Rush / Elestart 50 V5X4T 2T AC `88-`90
VESPA PK 50 XL2 / Elestart 50 V5X3T 2T AC `90-
VESPA PK 50 XLS 50 V5S2 2T AC `86-
VESPA PK 80 S / Elestart 80 V8X5T 2T AC `82-`86
VESPA PK 80 S Lusso / Elestart 80 V8X5T 2T AC `85-`88
VESPA PK100 S / Elestart 100 V9X1T 2T AC `82-`84
VESPA PK100 XL 100 V9X2T 2T AC `86-`90
VESPA PK125 125 VMX1T 2T AC `82-`85
VESPA PK125 ETS / Elestart 125 VMS1T 2T AC `84-`85
VESPA PK125 N NUOVO (FL) 125 VMX7T 2T AC `90-`91
VESPA PK125 S / Elestart 125 VMX5T 2T AC `82-`84
VESPA PK125 XL / Elestart 125 VMX6T 2T AC `86-`90
VESPA PK125 XL2 125 VMX6T 2T AC `90-

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