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Full Circle Crankshaft MAZZU..

..CCHELLI for Vespa 125 GTR 2°
/TS 2°/150 Sprint V 2°/Super
2°/P125-150X/PX125-150 E
reed valve, stroke 60,0mm, conrod 105,0mm,
pin 15mm

Full circle crankshafts were originally intended for use in reed valve engines. Their ideal field of operation though is with motors where the carburetor is mounted directly onto the cylinder itself. The extensive development of crankshafts on the German/Austrian racing scenes recently has enabled the 40 PS milestone to be reached and even exceeded without the use of nitrous oxide. The differing crank design concepts all start with the full circle crankshaft (from MAZZUCHELLI) as its basis.


The basic idea behind the full circle crankshaft is to enable an increase in the compression of the fuel mixture before it reaches the combustion area above the piston (HPC). With crankcase reed valve motors it cannot be helped that the full circle crankshaft crank webs interrupt the gas flow within the crankcase rather abruptly. The use of a cylinder where the carburettor is directly mounted onto it, such as the QUATTRINI 177cc1XL, release the true potential of a HPC crankshaft design. This combination allows higher engine revs and extra power.


The MAZZUCHELLI crankshafts are produced using tough and wear resistant materials, have minimal machining tolerances and very low bearing play. High revolutions and a long life are therefore guaranteed. If your needs are not satisfied with this crankshaft you may want to take the LPC route (flowed or bell shaped crankwebs)


Conclusion: Recommendable for the QUATTRINI 177cc cylinder. Top choice for reed valve engines.


Full circle crankshaft / stroke 57-60 mm / connecting rod 105-110 mm/ 24/25, M12

Full circle crankshaft, 95 mm crankweb (flywheel side), ø 97.9 mm crankweb (disc valve side), balanced at 12 o'clock, lower connecting rod bearing = silver bearing, 105 mm connecting rod (125/150 cc) or 110 mm connecting rod (200 cc), 57/60 mm stroke, oil seal housing 24 mm, bearing housing 25 mm, stump cone with M12 thread, incl. connecting rod bearing.


SIP-TIP: New bearings, oil seals, woodruff keys, nuts and washers for the flywheel and the clutch are a must. Adequate crankshaft tooling #27338000, #21071000 and #18119000 is a big help. Direct intake cylinders such as the QUATTRINI 177cc are the ideal basis. MMW or MBD reed valve manifolds are also a possibility.

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Racing Crankshafts

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2,150g / piece
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icon scootermodels This product fits the following models
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
LML Star 125 2T/ DLX / Via Toscana / Deluxe 125 2T AC
LML Star 150 2T / DLX / Via Toscana / Star / Stella / Belladonna RV 150 2T AC
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA 125 GTR 125 VNL2T 2T AC `68-`78 145901 ->
VESPA 125 TS 125 VNL3T 2T AC `75-`78 18139 ->
VESPA 150 Sprint Veloce 150 VLB1T 2T AC `69-`79 294260 ->
VESPA 150 Super 150 VBC1T 2T AC `65-`79 412374 ->
VESPA COSA 1 150 VLR1T 2T AC `87-`90
VESPA COSA 1 125 VNR1T 2T AC `88-`91
VESPA COSA 2 150 VLR2T 2T AC `91-
VESPA COSA 2 125 VNR2T 2T AC `91-
VESPA P125X 125 VNX1T 2T AC `77-`82
VESPA P150 S 150 VBX1T 2T AC `78-`90
VESPA P150X / PX150 E 150 VLX1T 2T AC `78-`85
VESPA PX125 2011/ 30 Jahre 125 ZAPM74100 2T AC `11-
VESPA PX125 CAT 125 ZAPM50100 2T AC `07-
VESPA PX125 E 125 VNX2T 2T AC `81-`83
VESPA PX125 E `98 / Millenium 125 VNX1T 2T AC `98-`05
VESPA PX125 E Lusso/EFL/Arcobaleno / Elestart 125 VNX2T 2T AC `83-`97
VESPA PX150 2011 150 ZAPM74200 2T AC `11-
VESPA PX150 E `98 / Millenium 150 VLX1T 2T AC `98
VESPA PX150 E Lusso/EFL/Arcobaleno / Elestart 150 VLX1T 2T AC `83-`97

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