Primary gear ratio for clutch Kingwelle/Crimaz CMX -BENELLI reinforced/straight-toothed- Vespa Largeframe PX, Rally, Sprint, Cosa, T5, LML 2T - 24/60 (2.50)

Benelli Primary Drives for Vespa Largeframe Models

Transmission parts by Stefano Benelli rightly enjoy an excellent reputation in the racing scene. If you are looking for reliable racing technology for your gearbox, this is the place to find it.
Hardened to an average of 60 HRC, Benelli parts provide exactly the right balance between sufficient hardness and the necessary 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 approx. model year 1965).

This kit offers several special features:

• Screwed cover plate = no riveting required!

• Very large selection of gear ratios = ultra-short (3.25) to ultra-long (2.40)

• Clutch gear for PX old-type clutch (6/7 springs) = compatible with Kingwelle or Crimaz CMX clutches

The kit includes the original primary springs of the PX200 models.

For high-performance engines, we recommend reinforced primary springs that can handle the high torque of a modified engine. Unlike original springs, these no longer go solid. This means the springs are not completely compressed and always maintain 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 bolted reinforced cover plate for the primary springs.
The other side is closed, i.e. it has been machined from solid together with the gear.

INSTALLATION NOTE
If the kit is used in a Malossi engine housing (VR-One / V-One), the area around the seat of the large crankshaft bearing must be slightly relieved.
Otherwise, the primary gear will interfere with the reinforced bearing seat of the Malossi engine housing.