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WebshopVespa Smal...Spare Part...Gear Box -...Primary Driven Gear 28 (28/68
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Primary Driven Gear 28 (28/68

-2.43) teeth, for full circle
crankshaft BSG, BSG for Vespa
50-125/PV/ET3/PK50-125/S/SS/XL
/XL2,
Ø 45,7 mm, straight teeth,
for primary 29-68

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.

 

 

This CNC machined crankcase represents an ideal basis for the extreme performance possible when these BSG parts are properly combined. A full-circle crankshaft, especially developed for this motor, is its heart. The clutch side shaft stump of this crankshaft has an extremely solid diameter of 17mm, which virtually guarantees long term stability.

To consolidate this toughness, this shaft requires the equally hard-wearing gear cogs, also produced by BSG. These have an internal diameter of 17mm, as opposed to gear cogs from all other manufacturers, with 14mm. These cogs, like other BSG products, are also made in limited production runs from a special steel alloy. They possess special threaded openings to enable quick replacement with the use of a special adapter. These cogs can be combined with all common. straight-toothed primary drive cogs such as the 24/72, 27/69 and so on, but is not compatible with SURFLEX transmissions.

Conclusion : If you already possess a BSG crankcase and crankshaft, these cogs are essential.

 

SIP-TIP : Do not forget to order a new primary drive from either RMS,OLYMPIA or DRT. New holding nuts, locking washers, woodruff keys, clutch friction plates and gearbox oil should also be included.


OEM Numbers (for the purpose of comparison)  (DRT)


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icon scootermodels This product fits the following models
  VESPA
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA 50 / N 50 V5A1T 2T AC `63-`71 not in series
VESPA 50 L 50 V5A1T 2T AC `66-70 not in series
VESPA 50 R 50 V5A1T 2T AC `69-`83 not in series
VESPA 50 Revival 50 V5R1T 2T AC `90- not in series
VESPA 50 S 50 V5SA1T 2T AC `63-`84 not in series
VESPA 50 Special 50 V5A2T 2T AC '69-'72 not in series
VESPA 50 Special 50 V5B1T 2T AC '72-'75 not in series
VESPA 50 Special 50 V5B3T 2T AC '75-'83 not in series
VESPA 50 Special Elestart 50 V5B4T 2T AC '75-'76 not in series
VESPA 50 Special Elestart 50 V5B2T 2T AC `72-`75 not in series
VESPA 50 Special Elestart 50 V5A3T 2T AC '69-'72 not in series
VESPA 50 SR / Sprinter 50 V5SS2T 2T AC `71-`79 not in series
VESPA 50 SS / Super Sprint 50 V5SS1T 2T AC `65-`71 not in series
VESPA 90 90 V9A1T 2T AC `63-`84 not in series
VESPA 90 Racer 90 V9SS2T 2T AC `71-`74 not in series
VESPA 90 SS Super Sprint 90 V9SS1T 2T AC `65-`71 not in series
VESPA 100 (UK) / 100 Sport (US) 100 V9B1T 2T AC `78-`90 not in series
VESPA 125 125 VMA1T 2T AC `65-`67 not in series
VESPA 125 Primavera 125 VMA2T 2T AC `67-`83 not in series
VESPA 125 Primavera ET3 125 VMB1T 2T AC `76-`90 not in series
VESPA PK 50 50 V5X1T 2T AC `82-`84 not in series
VESPA PK 50 S / Elestart 50 V5X2T 2T AC `82-`84 not in series
VESPA PK 50 S Lusso / Elestart 50 V5X2T 2T AC `85-`88 not in series
VESPA PK 50 SS / Elestart 50 V5S1T 2T AC `83-`86 not in series
VESPA PK 50 XL / Elestart 50 V5X3T 2T AC `85-`90 not in series
VESPA PK 50 XL FL 50 V5N1T 2T AC `90- not in series
VESPA PK 50 XL HP 50 V5N2T 2T AC `91-`91 not in series
VESPA PK 50 XL N NUOVA 50 V5X5T 2T AC `89-`90 not in series
VESPA PK 50 XL Rush / Elestart 50 V5X4T 2T AC `88-`90 not in series
VESPA PK 50 XL2 / Elestart 50 V5X3T 2T AC `90- not in series
VESPA PK 50 XLS 50 V5S2 2T AC `86- not in series
VESPA PK 80 S / Elestart 80 V8X5T 2T AC `82-`86 not in series
VESPA PK100 S / Elestart 100 V9X1T 2T AC `82-`84 not in series
VESPA PK100 XL 100 V9X2T 2T AC `86-`90 not in series
VESPA PK125 125 VMX1T 2T AC `82-`85 not in series
VESPA PK125 ETS / Elestart 125 VMS1T 2T AC `84-`85 not in series
VESPA PK125 N NUOVO (FL) 125 VMX7T 2T AC `90-`91 not in series
VESPA PK125 S / Elestart 125 VMX5T 2T AC `82-`84 not in series
VESPA PK125 XL / Elestart 125 VMX6T 2T AC `86-`90 not in series
VESPA PK125 XL2 125 VMX6T 2T AC `90- not in series

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