H2-ICBM® Plated Aluminum sleeves

Well, this is the H2-ICBM® sleeve with pillars. Of course, we had already made cast iron before aluminum plating. The effort required to make a two-stroke sleeve is almost the same whether it is cast iron or aluminum plating. In fact, it is more difficult to align the port with a router when using cast iron because cast iron is harder than aluminum. The cost of plating makes ICBM® more expensive, but if you are going to make two-stroke sleeves, I definitely recommend ICBM® from now on.

The port area is smaller because of the pillars, so we widened the sides and thinned the heart-shaped part to ensure the same port area as before.

At first, we made it without pillars and delivered it. Even with this, it seems that there has been no wear so far thanks to the hardness of the plating.

To explain the hardness of the plating, in terms of the Vickers hardness standard, the hardness of cast iron is about 45 to 140 at the hardest. In contrast, the plating of ICBM® is quite hard, with a Vickers hardness of 450 in the nickel base. Furthermore, silicon particles are mixed into the plating, and these silicon particles have a Vickers hardness of an amazing 2,000! They boast overwhelming hardness. These silicon particles are at the forefront of wear until the end, and even if the nickel base wears slightly, these silicon parts work hard, so there is no change in the dimensions of the inner diameter.

Last year, I had the opportunity to measure the cylinder of a YAMAHA Serow engine that had been driven 60,000 km, and the wear was almost within the margin of error. (About 5μ in diameter) The current plated cylinder is so hard that it can be said that it really "does not wear down."

Furthermore, as explained last time, we started delivering it with a pillar attached to the INTAKE port, and we have also completed the development of a pillar attached to the EXHAUST port, which is iB's specialty. We believe that this can be called the ultimate H1/H2 cylinder.

The H1/H2 was the world's fastest commercially available motorcycle at the time. I believe that it was Japanese-made motorcycles, which amazed the world before cars and electrical appliances, that played the role of the vanguard when Japan once again advanced economically into the world after World War II.

Among them, the impact that the Mach had on the world must have been no small one. I believe that we are now trying to make a cylinder that is, in a sense, the best in the world, which can cover the weaknesses of that world's best motorcycle. Is that an exaggeration? No, I don't think so.

Together with all Mach-loving owners, we would like to continue making the world's best cylinders! (^o^)