Love of details: bi-conical gudgeon pins from GRAND SPORT. Race sport plays a major factor in the development of this finely crafted detail. This small, yet innovative product lowers movable mass by quite a bit, resulting in stress reduction to other components and crankshaft. Noticeably lighter while retaining the same stable quality.
original MALOSSI gudgeon pin 136 cc, 44.5 grams
GRAND SPORT gudgeon pin #7502015 32.3 grams
original VESPA 125 P/V3 gudgeon pin 37.0 grams
GRAND SPORT gudgeon pin #75020160 34.0 grams
Power transfer of the piston to the connecting rod is done by the gudgeon pin. These are placed in grooves in the inner side of the piston. This groove often has a place for security rings/circlips to hinder the gudgeon pin from wandering outside. These should be replaced whenever the piston is renewed or replaced.
SIP-TIP: the right tools to make working on your cylinder easier are: piston ring pliers BU5045, BUZZETTI gudgeon pin tool installation/removal 15194000 and circlip chuck 1782000.