Mazzucchelli high quality long stroke crankshaft for Vespa PX200 scooters.

More stroke allows more cubic capacity, which in turn, means more power. That's why most 200er motors, whether race or road tuned, turn to long stroke crankshafts. To balance out stroke increase, spacers are set in either at the cylinder base or head. It's also a simple way to play around with timing.
With long stroke crankshafts, the stroke pivot is further from the crankcase axel: with 60 mm shafts, 1.5 mm. The additional 1.5 mm pushes over the top and lower dead center. To keep the piston from touching the cylinder head, cylinder head/base spacers can be installed or suitable cylinder heads can be used. Timing changes in any case. Depending on type of race cylinder.

Stroke = 60mm
Conrod length = 110mm
Crank pin = 16mm
Timing = 138°/6° post TDC

*Supplied with small end bearing

Mazzucchelli AMT166MK