They look really cool, but found some 'problems' with mine units when installing them on the motor blocks, the crankcase is too beefy (good!) and they were touching, needed to mill the engine mounts like this.

You can see more about the milling I needed to do here. Needed to done it on the two and was really quick to do with a Dremel and the almighty carbide bit.

Don't know if is that crankcase (my previous Sirios, were the first black ones the S12TRP ABC) or mine engine mounts (Mugen), but people should take care regarding this and n-check if the crankcase touches the engine mounts by other place rather than the mounting holes.

Is the seed for infinity of problems (bad gear mesh, stripped gears, up to a broken crankcase or worse... a broken crankshaft).