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.
The 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:
A special, self-made long-stroke version has already been tested here:
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:
Polini 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:
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.
At the end... 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...