Gearbox parts from Stefano Benelli enjoy a well-deserved reputation in the racing scene.
Anyone looking for reliable racing technology for their gearbox will find it here.
Hardened to an average of 60 HRC, Benelli parts provide exactly the right balance of hardness and elasticity to withstand the enormous stresses in a racing engine over the long term.
Benelli offers a reinforced primary kit for Vespa Largeframe engines with wide primary gear (from around 1965 onwards).
This kit offers several special features:
Screwed cover plate = no riveting required!
Clutch pinion for PX old type clutch (6/7 springs) = suitable for Kingwelle or Crimaz CMX clutches
The delivery includes the original primary springs from the PX200 models.
For powerful engines we recommend reinforced primary springs that can handle the high torque of a tuned engine.
Unlike original springs, these no longer bottom out completely.
This means the springs do not compress fully but still provide sufficient travel.
This prevents load peaks from being transmitted into the gearbox and protects the components despite increased engine power.
The primary kit is delivered ready to install and features a reinforced screwed cover plate for the primary springs.
The other side is closed, i.e. it has been machined from solid together with the gear.
ASSEMBLY NOTE
If the set is used in a Malossi housing (VR-One / V-One), the bearing seat of the large crankshaft bearing must be slightly machined.
Otherwise the primary gear will contact the reinforced bearing seat of the Malossi housings.
Primary gear 65 teeth |
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Primary pinion |
20 |
21 |
22 |
Ratio |
3.25 |
3.09 |
2.95 |
Primary gear 64 teeth |
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Primary pinion |
22 |
23 |
24 |
Ratio |
2.90 |
2.78 |
2.66 |
Primary gear 63 teeth |
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Primary pinion |
23 |
24 |
25 |
Ratio |
2.73 |
2.62 |
2.52 |
Primary gear 61 teeth |
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Primary pinion |
22 |
23 |
24 |
Ratio |
2.77 |
2.65 |
2.54 |
Primary gear 60 teeth |
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Primary pinion |
23 |
24 |
25 |
Ratio |
2.60 |
2.50 |
2.40 |
(US)
DE | €
