You are here:
WebshopVespa PX/T...TuningRacing Cra...Flowed Crankshaft SERIE PRO
 Your Shopping Cart
Your shopping cart is empty.
calculate shipping Live! Shipping Costs Calculation
 Your Notepads
notepad icon  Please login to use the Notepads.
webshop icon All Webshop
Your Scooter
Show only articles for selected scooter.
Most Popular Articles

SIP EuroFlat Banner
prev Pictures may look differentnext

Flowed Crankshaft SERIE PRO

worbspeed by Worb5 for Vespa
reed valve, stroke 54,0mm, conrod 105,0mm,
pin 16mm,
finely balanced

The flowed crankshafts belong to the Low Primary Compression (LPC) crankshaft type which originally leave the factory as MAZZUCHELLI or TAMENI full circle crankshafts. The SERIE PRO range of crankshafts are produced by the German tuners WORB5.


These flowed crankshafts are specially machined to optimise gas flow in the pre-combustion area of the crankcase. The crankwebs have been modified to enable the fuel mixture free flow, unhindered from the turbulence created by the crankshaft. This design also allows a higher volume of fuel mixture to enter the crankcase and so enable a higher compression of gases above the piston in the combustion area. This combination facilitates a wider power band and consequently higher maximum power. Flowed crankshafts are only suitable for use in reed valve motors. The original Vespa disc valve mechanism provided by the clutch side crank web is no longer possible with this heavily altered crankshaft.


Conclusion: Perfect for reed valve motors. Larger, gas flowed ports and inlets are finally possible!


Flowed crankshaft / stroke 45mm / connecting rod 105mm /M12

Flowed crankshaft with Ø 95mm crankweb (flywheel side), Ø 94mm crankweb (disc valve side), 105mm connecting rod, lower connecting rod bearing = sillver bearing, oil seal housing 24mm, bearing housing 25mm, stump cone with M12 thread, incl. piston rod bearing


SIP-TIP: New bearings, oil seals and keys are a must. Same goes for sealing kit, clutch-, and flywheel nuts. You’ll also need a POLINI, MALOSSI or MRP reed valve manifold.

Customers also searched for this article with:  Flowed crankcase

17010300 $178.31
Our Alternatives
for this item
45100300 $228.59
46060000 $461.76
Customers choice
might interest you...
20149130 $154.53
90994100 $0.46
YSS9042101 $68.58
12492000 $8.14

2,500g / piece
Stock on hand   Amount


Product forums
icon scootermodels This product fits the following models
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA T5 / Elestart 125 VNX5T 2T AC `85-`90 w/o separate lubrication
VESPA T5 Classic 125 VNX5T 2T AC `92-`95 w/o separate lubrication

Legend: Quantity In Stock

This article is in stock and ready to be shipped immediately. Our warehouse is fully stocked.
This article is in stock. This item is in stock in sufficient quantity.
This article will soon be sold out. This item will be sold out soon.
This item is ordered by us especially for you. Deliverytime might take more than 3 weeks. You cannot cancel this order any more. This item needs to be ordered especially for you. The expected delivery time is about 3 weeks.
This article is currently not available but will be back in stock soon. This item is currently not available but will be back in stock soon.
This article is currently not available. This item is currently not available. You can order it nevertheless. The expected delivery time is about 3 weeks.