I'm almost done retuning my yz426 back to a dry sump from a wet sump block off kit which the bike came with. Now that I fully understand the path the oil takes and how the return and feed pump work, I find myself wondering why the level in the frame needs to be so low on the dipstick. Basically if the bike holds around 1.5 quarts, how come you can't add an extra 1/2 quart to get more total volume. The level in the frame would rise, but the oil feed line comes from the bottom of the frame anyways. If its weight, it doesn't matter to me. The only other possible issue I could think of would be that maybe an over filled frame might create back pressure on the return line. Am I missing anything and what's the theory behind not filling the frame higher.