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Crankshaft -BGM Pro Touring (rotary valve) 60mm stroke, 105mm conrod- Vespa PX125, PX150

BGM031121G
€178.00 *

incl. VAT plus shipping costs

In stock: can be delivered or picked up in the store
General
EAN: 4251389103929
Bearings
sizes: 15x19x20mm
Gudgeon pins
diameter: 15 mm
Crankshafts
stroke: 60 mm
thread rotor side: M12x1,25 right-hand thread
thread drive side: M12x1,5 right-hand thread
diameter crankwebs: 98 mm
diameter bearing seat rotor side: 25 mm
diameter bearing seat drive side: 25 mm
diameter oil seal seat rotor side: 24 mm
diameter oil seal seat drive side: 31 mm
full circle crankshaft:
rotary valve crankshaft:
crankcase has to be milled:
engine casing has to be modified:
Connecting rods
length connecting rod: 105 mm
diameter small end connecting rod eye: 19 mm
lubricating hole at small end bearing: yes
lubricating hole at crankpin bearing: slot
crankpin bearing: silver cage bearing
crankpin shims: yes
P For this item you get fidelity point/s
MATERIAL The bgm PRO Touring crankshafts are forged. The material is more dense, thus...Continue reading

Description


MATERIAL
The bgm PRO Touring crankshafts are forged. The material is more dense, thus dissipating heat better and is therefore more resistant to distortion. Besides the crank webs, the connecting rod is also forged and then CNC machined.

BERAGING
The lower conrod bearing is lubricated via two large lubrication slots and a total of four additional pockets on the side. The SSC race bearing and the lateral thrust washers ensure a solid bearing. Lubrication of the upper conrod bearing is done via two lubrication holes. The INA piston pin bearing is included with the crankshaft.

HUB
The shaft is available with 60mm (long stroke) and with 57mm (standard) stroke. With the long stroke version more displacement is achieved, at the same time the control angles of the cylinder (overflow and exhaust ports) can be changed to increase performance.

INLETTING ANGLE
Compared to many other racing shafts the bgm PRO Touring Shaft has a much better layout of the intake time. For tuning cylinders the standard shaft with its very short intake time cannot keep up. The bgm PRO shaft, on the other hand, closes on a PX motor housing approx. 58° after top dead center (depending on the motor housing, this varies ex works). The motor can be well tuned with these control angles. TIP: If the intake is machined in a way that the crankshaft opens the intake slot earlier, additional power can be gained. A good value is about 120° TDC.

READY OF RELEASE
The crankshaft design of the PX engines is based on that of the first 125cm³ engines from 1960 with about 5 HP power. Unfortunately Piaggio never really changed this design during the later extensions. So the load capacity of the crankshaft with the standard 200ccm models with 12 hp is mathematically already exhausted. The crank webs are very narrow and have very little overlap (web material which, seen in diameter, is available above the lower crankpin). This means that neither a particularly high pressing dimension nor a large crankpin can be used, as would be necessary (for the performance of today's engines).
The BGM crankshafts are approved for a performance of up to approx. 20 HP due to their high material quality and bearings. For engines in this power range we recommend the use of a lightened pole wheel with max. 2300gr.

FAZIT
The bottom line is that the bgm PRO crankshaft offers highest quality in all aspects for every component. Precision in production, materials used and above all the precise balancing leave nothing to be desired. This guarantees extremely quiet and vibration-free engine running.

TIP
It is best to order the shaft seal 24x35x7 from Gilera Runner directly with the crankshaft. The wedi seat of the bgm shaft is wider than usual and can therefore be used with a double lip Viton Wedi.


AI-translation

 

Ratings


10 Jan 2018

👍Sehr passgenau. Alles Top

24 Jan 2015

gute welle,perfeckt gewuchtet

17 Jan 2015

Habe die welle noch nicht verbaut aber der erste eindruck von der Verarbeitung war Überragend... weiter infos folgen nach dem einbau...

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