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Racing Cylinder MALOSSI MK III

166cc by SIP for Vespa 125 VNB
/GT/GTR 1°/Super/150 VBA/VBB
/T4/GL/Sprint 1°/Super 1°,
Ø 61,0mm, cast iron, 2 ports,
stroke 57mm, conrod 0,0mm,
2 piston ring(s),
3rd port closed with spacer


High revs plus adrenaline! Both are guaranteed with the all-new MALOSSI 166cc performance cylinder kit. This kit possesses the largest capacity that MALOSSI produce for the smaller PX motors and is praised and renowned for its surging mid-range power. The strength of this sudden power-band means caution must be advised to avoid wheelying out of control during the test ride! The inclusion of taller gearing means fast lane motorway action, with speeds up to 130 kph easily achievable.

This high-end cast-iron performance cylinder possesses, with its seven transfer ports, triple-channel boost port and ASSO piston (including sport orientated 1.2mm thin piston rings), everything the heart of a true tuner desires. The unique design of the MALOSSI cylinder head includes an extremely effective squish band and an o-ring gasket system, making it a real highlight of this cylinder kit assembly.


This updated and redesigned MK II version replaces its predecessor completely. The main difference to the previous design can be found in the completely reworked and enlarged channels and windows of both the transfer and boost ports. Other elements of the kit though, such as the port timings and the comprehensive range of peripheral components originally included, remain identical. This port tuning update really is the icing on the cake in terms of performance, with similar modifications already well established amongst tuners as necessary in order to release its full potential. This update means these obvious improvements are now available from the MALOSSI factory as standard!


To bring the peripheral components up to the standard that this kit deserves we first recommend an upgrade of the original 20mm SI carb to a 24mm item from DELLORTO, or even better a 28 or 30mm diameter unit. A performance orientated exhaust type such as the SIP Road, MALOSSI, SITO Plus is also advisable, or even go the whole hog and invest in a full-blown hand welded expansion chamber. To further optimise the whole tuning project at least a racing or even long-stroke crankshaft also makes a lot of sense along with a stronger clutch. If a higher top speed is required you could also do with a taller overall gear ratio provided by either DRT, POLINI or MALOSSI gearbox components and/or a wide tyre conversion. With a reworked and optimised cylinder coupled with a fat expansion chamber pipe you can go out hunting MALOSSI 210cc cylinder tuners...


Conclusion: Even though this kit has less cc than its immediate competitors these MALOSSI cylinders provide an absolute guarantee of riding fun combined with real-world power and performance. This kit is designed to run at high rpm and consequently deserves suitable upgrades to all the relevant peripheral components such as the carb, crankshaft, clutch and exhaust.


Cast iron cylinder / 61mm bore / 7 transfer ports / 166.58cc

Cast iron cylinder, 57mm stroke, boost port with three port openings, piston includes two wedge section 1.2mm piston rings, factory produced MALOSSI cylinder head is included in the kit, to exploit the full potential that this cylinder can provide the crankcase porting should be modified to match those on the base of the cylinder. For safe and enduring use of this kit do not forget to check and adjust the jetting of the carb and the timing of the ignition.


SIP–TIP: A 24mm DELLORTO SI carb, a SIP Road performance exhaust and a strengthened clutch unit represent the absolute minimum of peripheral components required in order to do this high end cylinder conversion justice. A taller overall gear ratio and a race crankshaft with either 57 or 60mm con rod are also highly recommended. The inclusion of an expansion chamber exhaust system such as the SIP Performance, RZ or SCORPION, a 28mm + carb and a high end ignition system (VESPATRONIC, PARMAKIT, etc.) in your motors set up enables a much higher level of performance to be achieved. This cylinder kit is also ideal in combination with a reed valve manifold conversion, including all the necessary crankcase modifications.


SIP community user "4phonia"

"A wicked kick in the behind at high revs and even with just a 24mm SI an even wickeder power band to guarantee wide smiles! When the jetting and ignition are properly set up it will reward with long service and durability."


A powerful, high quality alternative to the more usual 2-transfer port cylinders available are our reworked OE PIAGGIO VESPA PX125/150cc cylinders, as well as the even more powerful 2-port version of the 177cc cylinders produced by POLINI and DR. The boost ports of these cylinders have been sealed and the transfer of fuel gas is provided by the ports of the same name, located on both sides of the bore. No further modification of your crankcase is necessary for immediate use of these cylinder kits, making them the ideal plug and play tuning option for all VESPA 125 VNB/GT/GTR/150 VBA/VBB/GL/Sprint/T4 and Super models. If your crankshaft has a bush, instead of a bearing at the small end, it will also need replacement.

Conclusion: Attractively priced cast iron cylinder, ideal for your daily runabout. If you wish, this cylinder can easily be further tuned with the addition of a 24mm carb, a reworked inlet port, a race crankshaft and a SIP Road exhaust.


SIP-TIP: For added power and reliability for your touring setup a race crank, expansion chamber exhaust, 24mm carb and an electronic ignition kit from VESPATRONIC can be included.


Robert Kremer, ScooterandSpareparts Kissing, November 2011:

"I built this reworked POLINI 2-transfer cylinder into a scooter for one of my customers. He is more than happy. The scooter accelerates strongly and is also very reliable over long distances. A more than adequate alternative to the PINASCO version."

Customers also searched for this article with:  race cylinder, performance cylinder, race cilinder, tuning cylinder

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Product forums
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 (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 -> 138956
VESPA 125 S 125 VNS1-6 2T AC `59-`65
VESPA 125 Super 125 VNC1T 2T AC `65-`69
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 Sprint 150 VLB1T 2T AC `65-`74 -> 105199
VESPA 150 Super 150 VBC1T 2T AC `65-`79 -> 328128

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