I'm no expert here in the crank area but looks like alot of material was removed from the crankshaft in the counterweight area does this engine have alot of vibration? Seems to me it would vibrate to some degree . Also all the smoothness would'nt let the fuel puddle to give it a forced induction action. Seems if I leave the area sorta porse where fuel will puddle then it seems to flow more fuel through the system. But thats just my opinion....?? Looks preety though!