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Racing Cylinder MALOSSI MK III

166cc for Vespa 125 GTR 2°/TS
/150 Sprint 2°/V/Super 2°
Ø 61,0mm, cast iron, 7 ports,
stroke 57mm, 2 piston ring(s),
with cylinder head


High revs and pure adrenaline! Both are guaranteed side effects of the famous MALOSSI 166cc tuning cylinder! The power-band kicks in around half way through the extended rev-range of the MALOSSI 139cc cylinders big brother. The sudden surge can challenge the unwitting for control of their scooter, especially the height at which the front wheel stops reaching for the sky! Combined with a suitable primary-drive repair kit for taller gearing, this fine cylinder enables the use of the overtaking lane of any motorway. Maximum speeds of up to 130 kph are easily attained providing the suitable complementary components are also included in your scooter engines set-up. This high-end cast-iron performance cylinder possesses a total of seven transfer ports, a three channel boost port and a high quality Italian ASSO piston with two low-friction 1.2mm thick piston rings - music to the ears of all serious motor tuners!


Another highlight of the MKIII Version is provided in the form of the, optionally available, all-new cylinder head produced by MALOSSI. Its features include a completely redesigned profile, a real-world squish-band clearance measurement and its special heat-proof 'O'-ring gasket. This cylinder head, that can be combined with this MKk III version of the MALOSSI 166cc cylinder kit, has been totally re-conceived from scratch. A freshly developed combustion chamber architecture and an increased cooling-fin area ensure an increase in both performance and transfer of heat from the cylinders interior. The layout of the cylinder is identical to that found on its predecessor the MK II, providing port windows of the transfers and the boost ports opened to the maximum.


The original 20mm SI carburettor should be replaced by the largest standard SI 24mm and the inlet port enlarged to match. Alternatively a complete upgrade to a 28-30mm carburettor kit is also possible, depending on the motors desired state of tune. The inclusion of a performance orientated exhaust system such as the SIP Road, a MALOSSI or a SITO Plus is also recommendable. To keep it all together a race or long-stroke crankshaft type is also a good idea, combined with a stronger clutch. If a higher maximum speed is more important to the motor project than lightning acceleration a DRT gear-kit, POLINI or MALOSSI primary-drive repair kits and/or a larger circumference rear tyre should also be included. A fully ported cylinder combined with an expansion chamber exhaust system can provide enough power to easily rival and conquer equivalent 200cc motors equipped with lesser-tuned MALOSSI 210cc cylinders!


Conclusion : Even though this cylinder provides slightly less cubic capacity than its direct competitors, it always manages to trump them for unbeatable riding fun, unrivalled reliability and real world performance! These high-end tuning cylinders are designed to operate at high revs and the remaining components (carburettor, crankshaft, gearbox, clutch and exhaust) included in your engines set up should be carefully selected to facilitate this higher performance.


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

Cast iron cylinder, 57mm stroke, 7 transfer ports, ASSO piston including two wedge-shaped 1.2mm piston rings, a Mk III MALOSSI cylinder head is included in the delivery along with all necessary gaskets. The port openings on the motor casings will require enlargement and matching to those found on the cylinder. Check and adjust both the ignition timing and the carburettor jetting.


SIP - TIP : For safe and enduring enjoyment of this cylinder kit a minimum of a carburettor with a diameter of at least 24mm, a SIP Road exhaust, and a stronger clutch should also be included. For a more harmonious performance we also recommend its combination with a taller overall gearing ratio and a race crankshaft with either 57mm or 60mm stroke. To really explore the limits of its potential a fully-blown racing exhaust such as the SIP Performance, an RZ or a SCORPION, a 28-30mm carburettor kit and a performance ignition system similar to the VESPATRONIC type should also be considered. The ultimate stage in tuning for this cylinder is provided in the form of a reed-valve carburettor kit combined with extreme porting of both the crankcase internals and the cylinders CVF II porting system.


SIP community user'4phonia' :

“A vicious kick in the pants at high revs, even a SI 24mm carburettor can help churn out power with a punch that forces a crack above anybodies chin! If you take due care and attention setting up the jetting and the tuning you will be greatly rewarded with a long lasting delivery of power!”

OEM Numbers (for the purpose of comparison)  3117181 (MALOSSI)

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

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4,860g / piece
Stock on hand   Amount
Est. date of delivery 11/21/2017
Daily arrival expected.


Product forums
Spare Parts
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 138957 ->
VESPA 125 TS 125 VNL3T 2T AC `75-`78
VESPA 150 Sprint 150 VLB1T 2T AC `65-`74 105200 ->
VESPA 150 Sprint Veloce 150 VLB1T 2T AC `69-`79
VESPA 150 Super 150 VBC1T 2T AC `65-`79 328129 ->
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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