The cooling head has been redesigned by Modelix. Its not as low as the B2102 lower profile but its lighter so it keeps the center of gravity as low as the B2102 but improving its performance on very high temperatures. The Ultimate M3T engine comes with a new carburator where high speed needle holder has been redesigned for a better refrigeration of the fuel flow into the carburator, lowering the temp of the carb. Besides this, the uniball joint of the carb slide has also been modified with two stoppers instead of one. With this new modified design, you can easier adjust the angle of the uniball joint without having to disassemble the engine. The backplate is CNC machined and made of 7075 T6 Swiss aluminum. The reason of making it with this material is to make it harder than the original and reduce the conrod backplate friction increasing the life of the conrod and improving engine efficiency and performance.
Thanks to its design, you can remove the backplate without damaging the conrod even when it is on its lower position (PMI) The lateral grooves allow to easily remove the backplate without having to use any tool that can damage it.