New Pistons to Boost Your Cossack Motorcycle Engine

a woman in a car shop with a piston in her hand

Hi folks, it’s been some time since I wrote the last post. Today I would like to tell you about one of the most important parts of every engine – pistons.

It’s winter time and my mind is somewhere away from motorcycling 🙂 All I do about my bike is visit his comfortable garage from time to time to make its engine work for a while. Last time I was in the garage taking stock of the spare parts I have new pistons caught my eye. I realized I haven’t told you about this topic yet.

There are literary thousands of websites telling people about what pistons are, their characteristics and other related stuff. If you need some basic info, you should google it. My story is about a specific type of pistons produced for most cossack motorcycles.

General Info about “The” Pistons

a new piston for a Dnipro engine

here is how such a special piston looks like

You probably wonder what is so special about these pistons. Well, their main advantage is that they don’t change their size when heated. The pistons are made of some specific material or in some specific way, or both, that allow them not to change their size under high temperature. As you know, when the engine gets too hot, its pistons can get heat seized, because high temperature makes the diameter of the pistons get bigger and thus the cylinders become too small for them.

The pistons are made somewhere in Europe. I’ve seen some chinese fakes that were sold as original European pistons. You should avoid such fakes, because they are of horrible quality and won’t provide any of the benefits you can get from the original pistons from Europe.

a high quality piston for Dnepr motorcycles

another photo of the piston from a different angle

They are available for most cossack motorcycles:

  • Dnipro
  • Ural
  • K-750
  • Jawa
  • IZH Jupiter
  • IZH Planeta

Perhaps, there are pistons of this type for other motorcycles, I’m not sure if my list is complete.

Advantages of Using “The” Pistons

The first advantage is obvious – you can forget about heat seizing. This is especially important for those who live in warm climate (Australia, Southern Europe and Southern states of the USA, etc.) and ride their bikes in hot summer days. You may say – hey what is so special about riding a motorcycle in hot summer days? Lots of cars and motorcycles work fine during summer time. Yes, you are right, yet we are talking about cossack motorcycles, which are air cooled. Do you know any car or motorcycle with an air-cooled engine that can easily survive being used in hot summer days?

Another advantage of the pistons I use is that they allow making very small gaps between the pistons and the cylinders. When I worked on my current engine, I made these gaps be 0.02mm. It’s not a joke, I really made 0.02mm gaps and I haven’t had any problems with this even despite riding my bike a lot in hot summer days.

high quality piston rings for new Dnepr pistons

you can find such rings via the code on the photo

The third advantage, at least for Dnipro and Ural engines, is that the pistons are available both for standard and automobile rings. I bought the pistons for automobile rings. This allowed me using high class automobile rings by Kolbenschmidt. They are much more efficient and reliable than standard Dnipro and Ural rings. These rings will also save oil from being burned in the combustion chambers.

I’m not sure how about other cossack motorcycles, but in case of Dnipro and Ural engines, the pistons increase the compression allowing you to use gasoline with higher octane rating and improving the engine performance.

To sum up the benefits of using “the” pistons I can say that installing these pistons will make your engine much more reliable, protect it from heat seizing, reduce oil consumption and improve the engine performance.

How to Get “The” Pistons

The pistons I’m talking about in this article are produced somewhere in Europe. If you live there or have friends/relatives living there, you might be able to find out where exactly they are produced and buy them from the manufacturer. As for me, I buy them from a local parts dealer, which keeps silence on where he gets the pistons from 🙂 Last time I bought the pistons (last summer), they cost me $40. If you fail to find them for sale in your country or your dealers are even greedier than ours, let me know, I might be able to help you get the pistons.

How to Install Pistons the Right Way

There are two ways to install pistons: the easy way and the right way. Most cossack motorcycle owners prefer the easy way, but if you want to get the best from your engine, I suggest sticking to the right way.

I’m sure most of you know how to install new pistons correctly. Yet, if you haven’t done this before, you might find this small description of the process useful.

It’s highly important to keep the right balance in any engine, especially a flat twin one. Lots of people simply weigh pistons and that’s it, while it’s important to weigh not only pistons but pistons, fingers and connecting rods. The general idea is to have all these parts have the same weight, this way the engine will be balanced, i.e. it will work more smoothly, which is especially important if you plan to use it on high RPM.

Hope this information will be useful to you guys and will help you make your bikes more powerful and reliable.

If you need some additional info or any other help, contact me via the contact form or leave your comment in the section below.

Ride safe,


Alex White
Alex White
I'm just a guy who values 3 things in life: girls, bikes and freedom. I get them all with my custom-built Dnipro MT. Cossack motorcycles are truly unique and reliable bikes if being treated right, and I decided to create this blog and share my vast experience and love for cossack bikes with other bikers all over the world. Need my help or advice? Contact me via skype or email.


  1. Boris Romanenko says:

    If I’m not mistaken, the fingers axle are placed aside for 1,5 mm from the pistons symmetry plane. You’ve got to concider this, while assembling the engine. You need to place both pistons down with this 1,5 mm.

  2. Nikolay Hristov says:


    Could you please share some more info about how to get those pistons because “somewhere in Europe” is not a very useful guideline 🙂
    At least take some photos of the box they came in..

  3. Carlos says:

    Yo se que en k 750 han montado pistones de Renault fuego o Renault 18 turbo,con muy buenos resultados

    • Alex White says:

      Hey Carlos,

      I haven’t heard of using Renault pistons on K-750, but thanks for the info. I don’t have a K-750, so I can’t check this myself, but perhaps some of the readers will try this.

      If you ask me, I’d say there is no point in using pistons that are meant to be used in cars, i.e. in water-cooled engines. Our engines are heated more heavily when working, that’s why we should use pistons that are created for higher temperature of operation.

Leave a Reply

Your email address will not be published. Required fields are marked *