221cc MALOSSI MHR cylinder for Vespa PX

Malossi follows suit with the MHR 221 long-stroke cylinder

After Polini with the Torque hammer 221cc an own Cylinder for their very beautiful 60mm stroke crankshaft, Malossi is also sending a version of the MHR cylinder for 60mm stroke into the race: Malossi MHR 221ccm for Vespa PX and Vespa Rally 200.

The Scooter Center delivery

We can do that Malossi MHR 221 cylinder already delivering for Vespa 200 and have taken a look at it for you:


Malossi 221 002


The new flask is immediately noticeable. Here a piston ring keeps the combustion pressure in check. The piston has not undergone any further changes. In the 1-ring variant, the piston ring sits in the same place as the upper piston ring in the 2-ring variant.

The length of the piston skirt is also identical to that of the piston in the 57mm stroke variant. When assembling with a 60mm stroke crankshaft, the length of the piston skirt must also be taken into account with the 221 to avoid hitting the crankcase.

As a replacement for the piston with one piston ring, the normal piston with two rings can also be used.



Malossi 221 012Malossi specifies a compression ratio of 98,3: 10,5 for the 1mm cylinder, which is slightly longer. The cylinder head is borrowed from the little brothers MHR210 and Sport 210 and is centered with bushings on the cylinder to the bore. We also quickly looked at the heights of the canals. Since the overcurrent channels on the right and left were not identical, we have entered the mean value here as 47,2mm.


Malossi 221 007

The outlet width is a good 63% in the green area. The moderate chord size and the large corner radii make the piston ring

make life easy and make the cylinder a permanently reliable service provider even on longer tours.

We are looking forward to the first 221ccm engines with the new MALOSSI MHR 221 cylinder that will appear on our P4!

You can use the new Malossi MHR racing cylinder for your Vespa PX Order here !

The cylinder takes care of:


  • 200 Rally (VSE1T - Femsa)
  • 200 Rally (VSE1T - Ducati)
  • What CL 200 (VSR1T)
  • 200 What CLX (VSR1T300)
  • 200 What FL (VSR1T301)
  • 200 PE (VSX1T - 1980)
  • 200 PX E Lusso (VSX1T - 1984-97)
  • 200 PX E (VSX1T - 1981-83)
  • 200 PX E Lusso (ZAPM18 - 1998-)


Polini 221 long stroke

Polini 210 goes Polini 221 long stroke! - Scooter Center - Version -
We wanted him from Polini and reported about it in 2011. Now the Polini 221 long stroke is finally here! From Monday, July 29, 2013 at Scooter Center Scootershop available

Polini 221 long stroke

Cylinder -POLINI 221 long stroke aluminum, 60mm stroke- Vespa PX200, Rally200

The “old” Polini 207 gray cast iron cylinder is a feared opponent thanks to its enormous torque, but due to the material used, it is not considered to be thermally very durable.

Thanks to the new Polini 210 Alu, this shortcoming is now a thing of the past. Due to the significantly better thermal properties of the hard-coated aluminum cylinder, the kit now runs thermally much more stable than its older cast iron counterpart. If the version for the standard hub of 57mm has already become a real bestseller, Polini is finally laying it at our request a version for the use of a long stroke shaft with 60mm stroke according to! This results in a whopping 221ccm, more than enough to get around quickly with a vehicle that usually weighs less than 100kg.

Overcurrent channels
The channel design of the cylinder was also adopted here from the well-known cast iron cylinder, but the control angles have been slightly changed / extended.

If the cylinder with 210ccm is already good for almost 15 HP and 20 Nm of torque on the rear wheel, the long-stroke variant adds several coals. The lower area, which is already very strong, is reinforced again, and the power peak and the band are expanded upwards.
Of course, the cylinder reacts with even more power to further expansion stages.

Depending on the purpose, ours is recommended here

And finally ...

The Polini is the tractor among the conversion cylinders. Its full torque and the good pulling power predestine this cylinder for the long tour as well as for the next traffic light duel! Now even stronger with an extra 10ccm!

Short facts:

  • Bore: 68,5mm
  • Stroke: 60mm
  • Connecting rod length: 110mm (series)
  • Displacement: 221ccm
  • Cylinder head: Included in delivery
  • Piston: cast iron, 2 piston rings
  • Special: crankshaft with 60mm stroke required


Please always assemble piston rings carefully. Piston rings made of cast material are only elastic to a limited extent and break relatively quickly.
Some pistons have trapezoidally profiled piston rings (so-called keystone rings), these only fit in one installation position. If the ring does not move freely, please loosen it carefully and turn it back into place 'upside down'.

POLINI 221 long stroke cylinder aluminum, 60mm stroke- Vespa PX200, Rally200
Cylinder Polini 221 Alu Vespa PX200

Polini's plan to bring the well-known 210cc aluminum cylinder for the PX onto the market in a long-stroke version (we reported), is finally taking on concrete forms.

Cylinder Polini 221 Alu Vespa PX200The new cylinder, which is presumably the well-known 210ccm cylinder (but with a longer raceway) in terms of layout, is delivered with a special cylinder head suitable for the stroke of 60mm. Further details such as control angle, compression and a performance specification are unfortunately not yet known, but we will send them as soon as available.

The The cylinder head is also available separately, since, according to Polini, it also fits the kits made of aluminum and gray cast iron with normal stroke. One will see how this is solved and what the interesting side of the head looks like.

We have published here what the 'normal' version of the Polini with series stroke (57mm) can do:

Polini 210 Alu Plug & Play

Polini 210 with processing

A special, self-made long-stroke version has already been tested here:

Polini 230cc

We expect one from the new version even broader performance curve than with the 210ccm variant, as the control angle inevitably increases through the use of a 60mm long-stroke shaft. Hopefully Polini will counteract the disadvantage of an excessively high overcurrent angle by adapting it by extending the cylinder's path. This would certainly result in an engine concept that many would like for everyday use: A lot of pressure from the low rev range, a strong middle and sufficient revving power for the motorway. The whole thing without the thermal balancing act of the old cast iron cylinders.

Polini also offers a crankshaft with a 60mm stroke to match your cylinder:

Crankshaft Polini PX200 60mm stroke for aluminum cylinder 221ccmPolini speaks of a very well balanced shaft which, thanks to tungsten inserts, should run with very little vibration even at high speeds. A modified intake time should also release more power. Here, too, we will submit all further information as soon as we receive it or have checked it ourselves.

The cylinder can of course also be operated with any other PX200 crankshaft with a 60mm stroke. A high quality and The significantly more cost-effective alternative is here bgm PRO Long stroke shaft which already proven in countless very powerful engines hat:

Crankshaft PX200 Lagnhub 60mm BGM pro

With currently €179,99 it is significantly cheaper despite the highest quality material (connecting rod + bearing!) and offers a sensibly extended inlet control angle perfect power package without the disadvantage of many other waves of spitting back into the gasr.

And finally ... Here, too, Polini is making clear its pioneering role in terms of product innovations for switch scooters. While competitor Malossi is currently limited to giving a new coat of paint to tried-and-tested but aging products simply by assigning new item numbers, Polini shows what you can do with tried-and-tested parts but a little more courage and innovative spirit.

In terms of price, the cylinder will certainly be slightly above the 210cc cylinder move because the long stroke kit is delivered with a cylinder head.

Cylinder and shaft together offer a high-capacity touring package that with a little attention to detail will certainly scratch the 20PS brand without having gear connection problems.
What more do you need?

Certainly one of the nicest innovations for PX200 drivers since the invention of the BGM Superstrong Cosa clutch...