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Crankshaft MAZZUCCHELLI for

SIP for Vespa 125 VNB/GT/GTR
1°/Super/TS/150 VBA/VBB/T4
/GL/Sprint/V 1°/Super 1°
disc valve, stroke 57,0mm,
pin 15mm, cone 20/25mm, M12,
valve timing: 112°/6° post
modified for PX igniton

Contact breaker ignitions are usually prone to failure, of limited suitability for tuning and a major risk factor on long rides. Which is why they are often times replaced with electronic ignitions. To do so, fans of the Vespa 125 VNB/GT/GTR//Super/TS/150 VBA/VBB/VGLA/B/GL/Sprint/V/Super had only two options so far: They could either use a qualitatively arguable BAJAJ ignition, or go for the top quality but very expensive VESPATRONIC. Now SIP dealt with the problem at the suggestion of STOFFI’s Garage. The solution is the fusion of two crankshaft types, the base of which forms the classic Sprint crankshaft with its original oil seal and bearing housing. While the disc valve side remains unaltered, MAZZUCCHELLI equips the flywheel side with the revised cone of a modern PX.

This SIP crankshaft allows you to use the proven and low priced electronic ignition of the PX on your vintage Vespa. Oil seals and bearing remain original Sprint. Due to housing tolerances you might encounter minor difficulties when mounting the ignition. To avoid a modification of the stator plate or the damage of the cables, we advise you to use a spacer.

Conclusion: Perfect solution for an easy conversion to electronic ignition


Crankshaft / stroke 57mm / 20/25mm, M12

Conversion crankshaft (to PX ignition) with Ø 95mm crankweb (flywheel side), Ø 97,9mm crankweb (disc valve side), oil seal housing 20mm, bearing housing 25mm, large px cone with M12mm thread, incl. piston rod bearing


SIP-TIP: New keys, flywheel nut M12 and lock washer are a must. Don’t forget to order a stator plate and a flywheel for PX (e.g: SIP Touren, PX200 or HP4). A stator plate spacer (# 50011300) makes sense, too.


Robert Zinnöcker "Zini". STOFFI-SIP Racing Team: "We have been waiting for this for years. Finally a reliable and inexpensive way to convert the old sprint engines to electronic ignition. Perfect."



The timings stated above were determined viewing in the direction of the clutch side. That means: "138°/6° after TDC: Inlet timing begins 6° after TDC and stays open for 138°.

Please note that the angular degrees given here are approximate values, as the crankshafts are reworked by hand.


Customers also searched for this article with:  crankcase, cranckshaft

icon explos Spare Parts Catalogue
This article can be found in the following exploded drawings ... go Go to Exploded Drawings!
86134000 $44.83
86134100 $63.12
85000000 $31.10
Our Alternatives
for this item
45153000 $125.33
45154000 $128.07
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50011300 $9.60
85000000 $31.10

2,050g / piece
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Spare Parts
fits on the following articles
divider Productname divider Art. No. divider Price divider Stock
Conversion Kit PREMIUM, e-ig.. ..nition, for Vespa 125 VNB/GT /GTR 1°/Super/TS 1°/150 VBA 500018J0 $456.48
icon scootermodels This product fits the following models
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA 125 125 VNT1-2 2T AC `60-`62
VESPA 125 (T2/125) (D) 125 VNB1-6 2T AC `59-`65
VESPA 125 GT / 125 Sprint 125 VNL1-2 2T AC `61-`73
VESPA 125 GTR 125 VNL2T 2T AC `68-`78 -> 145900
VESPA 125 S 125 VNS1-6 2T AC `59-`65
VESPA 125 Super 125 VNC1T 2T AC `65-`69
VESPA 125 TS 125 VNL3T 2T AC `75-`78 -> 18138
VESPA 150 150 VBB1-2 2T AC `60-`67
VESPA 150 150 VBA1T 2T AC `58-`60
VESPA 150 (T4/150) (D) 150 VGLA-B 2T AC `59-`65
VESPA 150 GL 150 VLA1T 2T AC `62-`64
VESPA 150 GL Touring (DK) 150 VGLA-B 2T AC `57-`58
VESPA 150 Sprint 150 VLB1T 2T AC `65-`74
VESPA 150 Sprint Veloce 150 VLB1T 2T AC `69-`79 -> 294259
VESPA 150 Super 150 VBC1T 2T AC `65-`79 -> 412373

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