BGM 58 x 116 Quattrini + RB Crankshaft Primatist

58x116 Quattrini / Rb bgm PRO Lambretta crankshaft – top performance for street and track
Made in Italy by Primatist.

This is where the best Lambretta crankshaft design meets the best crankshaft manufacturer - Primatist.

BGM crankshaft design is characterised by two factors compared to the crankshafts of other manufacturers:

Balancing factor: They don't cut corners here and the balancing factor, which is specially calculated for the weight of the Lambretta pistons, ensures silk smooth and low-vibration running. We work with solid tungsten weights (50 grams per crank web), additional copper weights and hidden pockets.

Full circle / HPC (High Primary Compression) crank: This feature delivers more power across the complete rev range thanks to the increased pre-compression.

Other features include:

Ground pressing surfaces for maximum stability of the joint and therefore maximum safety against twisting
Grounded and coated crankpin
Forged connecting rod with CNC finishing
Hardened and grounded bearing and shaft seal seats
Full circle crankshaft for increased pre-compression and more power
Forged crank webs
Low-vibrating engine thanks to sophisticated balancing with hidden pockets, copper and tungsten balancing weights
Lubrication of the lower connecting rod bearing via two large lubrication slots
Diameter of the crank pin 22 mm
The bgm PRO Competition shafts are the result of a total of 20 years of experience. A further three years of development work and testing went into optimisation to create a shaft that offers maximum torsional rigidity and stability. Here in this version from Primatist, who have more than proven their expertise in crankshaft design with countless victories in motorsport from the 1/8 mile drag racing to the 24-hour endurance races.