for Vespa 150 GS
also for MOTOVESPA 150 S/ Sprint/ GS
direct intake
stroke 57.0mm
conrod 105.0mm
Sport – con rod
pin 15mm
cone both sided
fine balanced
incl. conrod bearing

Grade AA – first-class repair and for tuned engines
Product description
High end crankshaft for Vespa fenderlight models. Highest quality for a perfect revision and a motor with maximum reliability and low vibration.
Together with the cylinder and piston, thecrankshaft represents the beating heart of any internal combustion engine. It is amongst the hardest working components and the conversion of the pistons stroke to a rotary movement places the highest demands on both quality and the care taken during construction. The crankshaft should also be well balanced to reduce any unwanted vibrations and the oscillating mass kept to a minimum to support an efficient delivery of the power created by the motor. The big-end bearing rotates at the same rate as the motors RPM, receives lubrication from the petrol/two-stroke oil gas mixture and must withstand two abrupt changes in direction of the piston for each motor revolution. The crank-pin, connecting both crankshaft webs with the con rod, has to be pressed into the webs with a certain clearance to the openings in the webs. If this connection is not strong enough the crankshaft can twist and the crankshaft webs become misaligned and seize. To ensure the big end bearing receives sufficient lubrication the big end of the con rod should be provided with slots to facilitate this.Very good balancedHighest quality in materials and manufacturingCon-rod with generous cooling slotsPerformance variant with high-end connecting rod
The crankshaftsThis all-new range of performance crankshafts are produced for in Italy and satisfy all of the above listed demands. We have concentrated our efforts to provide the highest quality combined with tried and tested technological features. Each crankshaft is balanced specifically to suit the stroke, con rod length and model of scooter for which it is intended.The crankshafts available in this range can be split into two main types. The ‘Premium’ are equipped with a ‘standard’ high end con rod type, meaning that its surface finish remains unmodified. It is provided with lubrication slots and holes, for the big and small end bearings respectively.The ‘Performance’ crankshaft models include a con rod of extremely high quality and they are made more enduring with an intensive polishing procedure that provides a more stable molecular structure. The smooth polished flanks of the con rod also help reduce turbulence. The polished con rods also have been optimised with a reduction in weight. They possess a gas-flowed profile and been modified around the big end to improve the bearings lubrication.The crankshafts for the Vespa 150 GS modelsFor the engines of the 150 GS models we also offer crankshafts of the highest quality in different versions. We offer both the original replacement with a bronze bushing (item no. 45140500) and the more modern version with a needle bearing for the gudgeon pin (item no. 45142200). If you want to treat your GS to something more high-quality, you can use the “Performance” version with the high-quality polished connecting rod (item no. 45142300). If you want to use a PX clutch in your GS engine, you can use the crankshaft no. 45142400Conclusion
: The better replacement for the original crankshaft
.

When replacing the crankshaft always change the bearings and oil seals.Also very useful are the crankshaft tools #27338000
, #21071000and #18119000
.
New: The crankshafts that came with the Vespa VS5 models already possessed a big-end bearing instead of a bush assembly. This upgrade makes the crankshaft much more suitable for higher revs, less fuel oil is required in the mix ratio and the danger of the big-end seizing is greatly reduced. We here athave had these crankshafts reproduced.TheVespa GS 150 crankshaft is fully compatible with the Vespa VS2-5 model and is also the first choice for incorporation into the motor of the Vespa GS 3 model.measures
A
B
C
D
crankshaft
Fig. 1
conrod
Fig. 2
105
29
19,1
15,4
pin
Fig. 4
34
22
18
washer
Fig. 9
36
22,2
0,6
OEM numbers (for comparisons):
59497 (PIAGGIO)
EAN Number:
4260277181604