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WebshopVespa Smal...Spare Part...Gear Box -...Primary Driven Gear 25 teeth,
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Primary Driven Gear 25 teeth,

BENELLI for Vespa 90 R/SS/125
/PV/ET3/PK50 XL/XL2/PK125
/ETS/N/S/XL/XL2,
straight teeth, for primary 27/69,
Grade AA - for a first-class
repair for tuned engines

Stefano BENELLI has been passionate about all possible petrol-driven vehicles, either two or four stroke, since the 1980's. His love of the two-stroke is strong and especially for the Vespa. This is where he could gather his first experience in motor tuning and many of his developments have seen successful use in scooter sprint racing. He found that the original Vespa gearbox was unable to cope with the extra power.

Back in the days when the only aftermarket gearbox component available here in Germany was a shorter 4th gear for the smallframe engine, the BENELLI range of gearbox parts were already being included in scooters racing in the Italian national racing series. In more recent times gearbox parts from a number of manufacturers have become available. Outside of his home country of Italy, parts produced by BENELLI were very hard to obtain and only a small exclusive circle of racers and tuners were even aware of their excellent reputation and existence.

During product comparisons conducted in Germany his gear cogs were rated better than those from other component manufacturers. Nowadays the BENELLI enterprise has become a small-scale producer of high-end gearbox components using the finest materials suited for a wide spectrum of potential employment. They have proven successful for use in off-road, circuit and sprint racing machines.

 

The most simple and effective method of overall gear ratio adjustment is to replace the primary drive cog on the crankshaft. A basis for this conversion is provided by a primary drive with straight-cut cog teeth. The fine adjustment of the smaller of the cogs in the primary drive enables the gearbox to be set up precisely, to suit every stage of tuning.

 

The BENELLI gears are very high quality processed, tempered and made of special steel.

 

The choice of the correct primary drive ratio depends on a number of factors: Nominal motor speed, gear ratios, area of use, and the circumference of the rear tyre.

The primary drive gear ratio is determined by the number of cog teeth on both of its cogs.

A 72/24 primary drive provides a 3.00 gear ratio and the greater this value (or quotient), the shorter the ratio.

 

The BENELLI produced Vespa smallframe primary drive cogs are suitable for use with the existing gear ratio and are also compatible with primary drives made by other producers. BENELLI offer a variety of possibilities for combination with the 24/72 and the 27/69 primary drive cog sets.

 

Conclusion: Once the primary drive has been installed in the gearbox it can be further fine tuned by replacing individual gear cogs.

 

SIP-TIP : Do not forget to order the suitable primary drive cog by either RMS, Surflex, Crimaz or DRT!


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BENELLI
Gear Box - Input Shaft - Kickstart Lever

 
52,00 €
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Art.No.
24525940

60g / piece
Stock on hand   Amount

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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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