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Crankshaft -MAZZUCCHELLI Racing (rotary valve)- Vespa PK50 XL (Ø=20mm cone)
Part no.:
1610007
Description
In order to achieve higher speeds, one should reach for the racing shaft. The extended intake timing results in a much freer engine revs. This measure is especially noticeable with high-revving cylinders.
The quality of the crankshafts is very good and so they resist even highest revs. Especially for the higher capacity engines from 125ccm up they are an optimal supplement to extend the usable speed range of racing cylinders without spitback in the lower speed range.
AI-translation
The quality of the crankshafts is very good and so they resist even highest revs. Especially for the higher capacity engines from 125ccm up they are an optimal supplement to extend the usable speed range of racing cylinders without spitback in the lower speed range.
These engines offer both, a decent torque over the whole speed range and a free unscrewing, without the engine running out of air on inclines.
The PK XL shaft also offers the enormous advantage that it has a very stable cone and can therefore digest much higher forces. It also allows the use of ultra-light pole wheels, with which a better acceleration behavior can be achieved.
TIP:
For cylinders from 75cc capacity directly order a wider upper connecting rod bearing! (see "Accessories")
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€123.00 *
incl. VAT plus shipping costs
Available immediately (delivery time 1-3 working days*)
P
For this item you get
fidelity point/s
| Bearings | |
|---|---|
| sizes: | 12x17x13mm |
| 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: | 25 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: | 184 mm |
| Vespa V50, PV - intake timing for short rotary surface (22mm) (°): | 146 |
| Vespa PK XL2, ETS - intake timing for long rotary surface (28mm) (°): | 155 |
| Vespa PK XL2, ETS - intake timing for long rotary surface (37mm fully modified) (°): | 167 |
| crankcase has to be milled: | |
| engine casing has to be modified: | |
| Connecting rods | |
| length connecting rod: | 87 mm |
| thickness connecting rod: | 4.8 mm |
| diameter small end connecting rod eye: | 17 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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