Crankshaft MAZZUCCHELLI AMT 028 VT For Vespa 50 PK XL Round flywheels - Stroke 43 Cone 20 Connecting rod HF int. 87
reed valve
stroke: 43.0mm
connecting rod: 87.0mm
Standard - connecting rod
Connecting rod bearing: 12x17x12.7mm
Piston pin Ø 12mm
cone 20/20mm, M12
Ø Alternator side oil seal seat: 20 mm
Ø Bearing seat alternator side: 20 mm
Thread on alternator side: M12
Racing crankshafts are a simple and effective tuning step for every rotary valve engine. A racing engine allows for a higher number of revolutions. The engine becomes more lively and agile. The high-quality racing crankshafts from the Italian company MAZZUCCHELLI convince with their minimal production tolerances and limited bearing play. This guarantees a high rev resistance and an exceptionally long product life.
In contrast to the original crankshaft, a crankshaft has a significantly extended input stroke time. This means that the charge level is increased. The crank arms are flow-optimized and polished. Turbulence and flow separations are thereby reduced. A polished connecting rod and a lower connecting rod bearing as a silver bearing meet the highest aspirations. All crankshafts are supplied with upper connecting rod bearings.
Those who want to convert to electronic ignition should go for the 20/20mm stroke crankshaft. In combination with a stroke cylinder, the thicker and therefore more stable cone is recommended. The ETS crankshaft should be installed on high revving engines that are equipped with high performance cylinders or very light flywheels. This omits the risk of the crankshaft stub being torn off. A set of conversion bearings and the corresponding oil seal are then held in the V50/PV/ET3/PK engine casings.
A reinforced connecting rod is fitted to the RACE version. Additional lubrication holes at the top (for the 125 series only) and lower lubrication slots increase the cable eyelet rod stability and allow for higher rpm due to the superior lubrication.
Conclusion: Not only a good idea in combination with a tuning cylinder. An increase in performance can also be achieved with an original cylinder. MAZZUCCHELLI stands for long product life and durability.
Racing crankshaft / 43mm stroke / 87mm stem / 29/20mm, M10
Racing crankshaft with 82mm crankweb (flywheel side), 87mm crankweb (rotary valve side), 87mm crankshaft, 20mm oil seal, 20mm bearing, large cone with M12mm thread, incl. bearing shaft
Specific References
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