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They transmit the entire torque to the rear wheel. They ensure a uniform power transmission to the gearbox and dampen the unbalance of the crank drive between the dead centres. Heavy crankshafts, increasingly lighter flywheels and heavy load changes not only during racing, shorten the hard life of the original springs.
Fitting to the BGM PRO primary repair kits BGM0195F48 and of course the original primary repair kits, we have included reinforced springs in our range.
Compared to a Piaggio spring, the BGM spring offers more spring force and more working distance due to the selection of the spring wire.
The larger possible working travel and increased spring rate protect the gearbox and primary drive from tooth breaking load peaks even under harsh operating conditions.
The advantages of the BGM PRO spring (BGM0190F48) for primary Vespa large frame: