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Crankshaft -BGM PRO Racing (rotary valve)- Vespa PK50 XL (Ø=20mm cone)
Part no.:
BGM2400
Description
The BGM crankshafts are forged like in the good old Piaggio times. In forging, the material is pressed together under temperature and high pressure. This results in a higher density of the material. Heat is dissipated much better. The material is more resistant to distortion. This is a huge advantage compared to crankshafts made to order by other manufacturers whose materials used often do not even reach the level of a series shaft.
Tuning:
The high quality of the material used also allows the use of very light-weight spark plugs without the risk of crankshaft damage. This allows a better acceleration behaviour to be combined with a considerably increased durability of the engine. This is particularly important on engines with large displacement and high rpm.
improvements:
An interesting side effect is the conversion to an electronic 12V ignition, which is always necessary when converting a Vespa 50 S/N or PK50S to this crankshaft type.
With our BGM ignition kit, even the otherwise strongly - underexposed - 6Volt Vespas can enjoy the brilliant 12Volt halogen light.
AI-translation
Tuning:
The high quality of the material used also allows the use of very light-weight spark plugs without the risk of crankshaft damage. This allows a better acceleration behaviour to be combined with a considerably increased durability of the engine. This is particularly important on engines with large displacement and high rpm.
improvements:
An interesting side effect is the conversion to an electronic 12V ignition, which is always necessary when converting a Vespa 50 S/N or PK50S to this crankshaft type.
With our BGM ignition kit, even the otherwise strongly - underexposed - 6Volt Vespas can enjoy the brilliant 12Volt halogen light.
Control angle:
The control angle of this crankshaft is extended compared to a standard shaft.
Ideal for all cylinders, from 50cc Sport to 112cc Racing, to miss a lot more steam.
With tuning cylinders the standard shaft with its clearly too short intake time does not come along. When a certain speed level is reached, it is then really locked off.
The engine can be tuned with the optimized control angles of our shaft as if an original Piaggio shaft was used. Nevertheless, the extended intake angle ensures that even completely made engines can turn out fully.
In addition, the rotary vane inlet of the housing can be extended to create enough space for larger carburettors and to further increase the performance of the engine.
- stroke:43mm
- Control angle: Sport / Racing
- cone type: PK XL50
AI-translation
€114.95 *
incl. VAT plus shipping costs
Available immediately (delivery time 1-3 working days*)
P
For this item you get
fidelity point/s
| General | |
|---|---|
| EAN: | 4250366615509 |
| Bearings | |
| sizes: | 12x15x15mm |
| Gudgeon pins | |
| diameter: | 12 mm |
| Crankshafts | |
| stroke: | 43 mm |
| thread rotor side: | M12x1,25 right-hand thread |
| thread drive side: | M10x1,5 right-hand thread |
| diameter crankwebs: | 87 mm |
| width crankwebs: | 37.6 mm |
| diameter bearing seat rotor side: | 20 mm |
| diameter bearing seat drive side: | 17 mm |
| diameter oil seal seat rotor side: | 20 mm |
| diameter oil seal seat drive side: | 22.7 mm |
| full circle crankshaft: | |
| rotary valve crankshaft: | |
| length rotary crankweb: | 185 mm |
| Vespa V50, PV - intake timing for short rotary surface (22mm) (°): | 145 |
| Vespa PK XL2, ETS - intake timing for long rotary surface (28mm) (°): | 153 |
| Vespa PK XL2, ETS - intake timing for long rotary surface (37mm fully modified) (°): | 166 |
| crankcase has to be milled: | |
| engine casing has to be modified: | |
| Connecting rods | |
| length connecting rod: | 87 mm |
| thickness connecting rod: | 4.3 mm |
| diameter small end connecting rod eye: | 19 mm |
| lubricating hole at small end bearing: | yes |
| diameter crankpin: | 20 mm |
| lubricating hole at crankpin bearing: | notch |
| crankpin shims: | yes |
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