Tag Archive for: Vespa gearbox

New Vespa tuning gearbox - Benelli gearbox Vespa

New Benelli gearbox Vespa?

Well, to be honest, the Benelli transmissions are not that new: STEFANO BENELLI  has been infected with the Vespa virus since the 80s. In the motherland of Vespa there has always been Vespa tuning and motor sports such as drag races, circuit races and Vespa cross. As a passionate tuner, Stefano is active in the Vespa racing scene.

The history of the tuning possibilities of the Vespa transmission in Germany is quite clear. At first there were mostly far too long primary translations by the top dogs like DR, Polini, Malossi and Pinasco. Then there was the “short 200th gear” from a Vespa T4 for the PX 5, and the scooter was often given the right fender at the same time. The four-disc clutches with mostly too hard springs and pressure plates with ball bearings were soon replaced by the “Cosa clutch”, which bgm has continued to develop to this day as Superstrong clutch for many is THE Vespa clutch at all. Somewhere in between there was a Vespa PX 5-speed gearbox that was unfortunately not very durable.

At that time, the high-end Vespa tuning gearboxes from Benelli were already being used in Italy. Well-known tuning companies like ZIRRI or BFA / BFG have the gearboxes manufactured by Benelli. In Germany they are Vespa Benelli gearbox largely unknown and difficult to come by. That's changing now, that Scooter Center has added Stafano Benelli's Vespa gearboxes to its range.

Why a Benelli Vespa gearbox?

Building a powerful Vespa engine is no longer a problem thanks to the available selection of components.

Real displacement giants such as the M244 and M200 from Quattrini or the Malossi MHR 221 often shovel over 30Nm of torque to the rear wheel.

Thanks to the high torque, quite long primary reductions can be driven, which, in combination with a well-graded gearbox, create a very flexible motor.

Suitable transmissions from Stefano Benelli come from the vicinity of Parma / Italy, which, in terms of workmanship and the range of gradations, are a perfect match for engines with increased performance. the Benelli gearbox for Vespa have got through

• top processing
• Range of gradation,
• Reliability and
• precise manufacturing

in the established Italian racing series and shine like new even after a tough 24-hour race.

Benelli transmission parts for Vespa Largeframe

For sporty engines in the LargeframeRange, offers Benelli reinforced secondary waves on. The “Drag Cluster” series is manufactured with a continuous toothing on the third and fourth gear and is delivered with its own gear wheel for the fourth gear.

This type of production means that an extremely robust tooth module can be selected, which makes the Benelli auxiliary shafts the first choice for highly stressed engines. The short and crisp secondary waves are on best combined with a longer primary.
The Primary reductions from bgm offer the advantage here that the module, as with the Benelli gearboxes, can be selected to be very stable.

Touring transmissions also available

Benelli gearbox Vespa for the Largeframe and Smallframe Engines Touring variants of the auxiliary shafts are also available from Benelli. Here the know-how is combined with carefully selected good workmanship and material selection. These auxiliary shafts can each be driven with the original transmission gradation and optionally shorten the jump from gear III to gear IV or the graduation between gear II, III and IV.

In order to find the right gear, or rather the right gear ratio, it makes sense to orientate yourself on the performance of an original engine, in the LF area of ​​the PX200. At a speed of approx. 100km / h, the motor of a PX200 rotates around 6000rpm and provides approx. 10PS on the bike.

If the fourth gear is now shorter in order to shorten the jump from gear III to gear IV, only a lower speed is achieved in gear IV at the same engine speed.

In order to increase the speed again at the same speed, it is advisable to extend the primary reduction again. In the end, the engine is again 6000km / h at about 100rpm, with the advantage that the jump from third to fourth gear is significantly shorter and the engine accelerates better in fourth gear. Another pleasant effect is that the longer primary drive means that gears I and II are no longer so aggressive in a more powerful engine, and the first and second gears can also be used more flexibly and in a controllable manner.

Here is a graphical comparison - PX200 original for Benelli auxiliary shaft short third + short fourth gear with a BGM primary.

The gear wheels on the main shaft are identical with 57-42-38 and 35 teeth.

Following the example above, the following combinations of auxiliary shafts and primary reductions are suitable:

Secondary shaft -BENELLI- Vespa PX 12-13-16-19 - short third gear, extra short fourth gear : Primary kit -BGM PRO, type Cosa2 / FL Primary gear BGM Pro 62Z Vespa PX Z24 / 62 (2,58)

Countershaft -BENELLI- Vespa PX 12-13-17-20 - short fourth gear : Primary kit -BGM PRO, type Cosa2 / FL Primary gear BGM Pro 63Z Vespa PX Z23 / 63 (2,74)

Benelli transmission parts for Vespa Smallframe

The same also applies to the Benelli transmission of the Vespa Samllframe.

Various auxiliary shafts for touring and complete transmissions for racing use are available from Benelli.

For the long tour, the auxiliary shafts are available with a short fourth gear and a short third, short fourth gear.

The performance of an original Primavera 125 serves as an example. As in our example with the PX200, the too long jump from third to fourth gear is shortened and the final speed to be achieved is adjusted again with a suitable primary.

So here once with the original Primary 24-61 of the Primavera and a bgm primary 27-65 and the Secondary shaft with the short fourth gear.
You can clearly see that gears 1,2, 3 and 3 are a little longer and the jump from gear 4 to gear XNUMX is a little shorter. So the engine has a chance when shifting
From the point of view of the speed, it is then tackled when there is sufficient power available to continue to accelerate quickly immediately after the gear change.

Stefano Benelli also offers an extensive selection of components for the racetrack or sporty driving style.

Starting with Primary gears to change existing, straight-toothed primary drives 3.00 and 2.56, about their own Primary drives including reinforced repair kit, up to complete transmission solutions.

In particular is the reinforced main shaft to mention. The choice of materials and the tempering process result in an extremely resilient component.

In contrast to other Italian manufacturers, the Benelli drive shaft still has the usual taper in the shaft. This means that even sophisticated solutions in the area of ​​the coupling have sufficient distance from the main shaft. In other manufacturers, the main shafts are usually made unnecessarily thick, so that a Hartz4 coupling can touch the main shaft in extreme cases.

Benelli gearbox Vespa set Vespa Smallframe

The top solution is definitely the GPR or BULL gearbox.

The GPR Benelli gearbox Vespa comes without a main shaft and can be combined with a Piaggio main shaft.
Together with the main shaft the gear is then "BULL" bezeichnet.

The gradation of the gears remains identical with 12/58, 13/42, 15/38, 17/37 teeth. Depending on the performance of the engine, the transmission can be combined with a 2.60 BGM primary or with a 2.56 standard primary.

Compared to the original gearbox

Gearbox -BENELLI type GPR- Vespa V50, V90, 50N, PV125, ET3, SS50, SS90, PK S, PK XL1, PK XL2, ETS - (12/58, 13/42, 15/38, 17/37 teeth)

Article no. BE10000GPR

BENELLI gearbox Vespa GPR
The GPR version offered here is a special, closely spaced racing gearbox that was designed for maximum propulsion on the race track. The first three courses are longer than in series, the fourth gag is significantly shorter. The gear steps between each other are shortened from the second gear. This results in a sporty, narrowly stepped transmission that is only slightly shorter in terms of its overall reduction than a standard transmission (at 9000 rpm in fourth gear approx. 5 km / h). The much more stable gear wheels including the auxiliary shaft are therefore ideal for use in racing or for sporty drivers whose engine benefits from a closely stepped gearbox.

(12/58, 13/42, 15/38, 17/37 teeth)

The Benelli GPR gearbox forms a unit and cannot be combined with gear wheels from other manufacturers. It has a special kick starter pinion which is included.

bennelli-gearbox-vespa-bull_BE10000RB_4

bennelli-gearbox-vespa-bull_BE10000RB_2

bennelli-gearbox-vespa-bull_BE10000RB

bennelli-gearbox-vespa-bull_BE10000RB_3

bennelli-gearbox-vespa-bull_BE10000RB_1

Gearbox BENELLI BULL Vespa V50, V90, 50N, PV125, ET3, SS50, SS90, PK S, PK XL1, PK XL2, ETS - (12/58, 13/42, 15/38, 17/37 teeth)

Article no. BE10000RB

BENELLI BULL
The complete Benelli Bull transmission consists of the GPR set, but also contains a reinforced version of the main shaft with shift claw, shift spring, shift balls, shoulder and circlips. The main shaft is delivered fully assembled and adjusted.