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Crankshaft -BGM Pro Touring (rotary valve) 57mm stroke, 105mm conrod- Vespa PX125, PX150

BGM031120G
This item is currently not available.
€179.00 *

incl. VAT plus shipping costs

The item is ordered and will be in stock soon

Estimated delivery date: 22/11/2019

Bearings
sizes: 15x19x20mm
Gudgeon pins
diameter: 15 mm
Crankshafts
stroke: 57 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
Please inform me once the product is available again.
P For this item you get fidelity point/s
Like in the good old days at Piaggio, the bgm PRO crankshafts are forged. The forging process...Continue reading

Description


Like in the good old days at Piaggio, the bgm PRO crankshafts are forged.
The forging process gives a much higher density to the material. So you gain a better thermal coefficient and a much stronger material. Like known from the WIESCO pistons.

Beside the crank webs the con rod is forged as well and afterwards CNC finished.

There is no doubt about the lubrication and bearings of the crankshaft. The lubrication of the big end pin is by two large slots and four additional pockets at the side. The SSC racing bearing and the two fat shims make it a very solid construction.

For the lubrication of the small end bearing there are two holes at the small end. The delivery contains a INA small end bearing.

The crankshaft is available with longer stroke 60 mm and standard stroke 57 mm. The long stroke gives not just more cc, it enables you to set the port timings of the transfers and exhaust more freely. Give us a call or sent us an email for the perfect match of crankshaft and cylinder kit.

The bgm PRO Racing crankshaft has a much better inlet design than any other crankshaft:

The inlet timing of the standard crankshaft is not suitable for tuning purposes. The timing is too short and once you reach a certain amount of revs, the inlet timing will close off.

The commonly available Racing crankshafts do have longer inlet timing, but the inlet is opened too long after top dead centre. A massive engineering problem that gives heavily blowback, bad low down and mid range power and hard to set up carbs.

The bgm PRO crankshafts is closed after 58° after top dead centre. Something we figured out with heavily dyno and road testing. With the bgm crank the set up of the engine is as easy as if an OEM Piaggio crank is fitted. The improved timings are capable of working with the most powerful cylinder kits like the Parmakit 177. Even with the tiny SI carb power figures of more than 20 hp at the rear wheel are easily to achieve.

UPSHOT:All in all every single detail of the bgm PRO crankshaft is spot on. Machining, materials, balancing and the engineering leave nothing to be desired.

Techtipp:Another bgm design gimmick of the crank is that you can fit the Gilera Runner oil seal as an option. The 24x35x7 can be used on the flywheel side. It is stronger, double lipped and made from Viton.
 

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In stock: can be delivered or picked up in the store
€179.00 *
*incl. VAT plus shipping costs
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