Primary gear spring BGM PRO Vespa V50, V90, SS50, SS90, PV125, ET3, PK50, PK80, PK50 S, PK

The now possible power and torque values of so-called small-frame motors have increased considerably in recent years and appear to be growing steadily. Power and torque values of well over 35PS / 30Nm are becoming increasingly common. Of course, other components are also subject to much higher loads as a result.

Through them, the entire torque is transferred to the rear wheel. They ensure uniform power transmission to the gearbox and dampen the uneven running of the crank drive between the dead centres. Heavy crankshafts, increasingly lighter flywheel masses and heavy load changes, not only in racing, shorten the hard life of the original springs.

By fitting the BGM PRO primary repair kits BGM0190, BGM0192, MMW Hartz4/5 and, of course, the original primary repair kits, we have added reinforced springs to our range for you.

Compared with a Piaggio spring, the BGM spring offers greater spring force and, due to the selection of spring wire, more working travel.

Due to the greater possible working travel and increased spring rate, the gearbox and primary drive are protected from tooth-breaking load peaks even under harsher operating conditions.

The advantages of the BGM PRO spring (BGM0190F) for Vespa Smallframe primary drives:

• increased working travel
• increased spring force
• original installation dimensions
• material selection and processing for increased durability
• suitable for many primary drives

70N/mm