Yeah, I really like my 505 1d.
People say the clutch is shit, but I had the drive gear strip on my first D engine before the clutch gave way. I did feel some slippage in there though. That engine was fucked when I got it though.
Now I have a D with a fresh rebuild on there and have had zero issues. I just put a biturbo hack/weld job on there` and I likes it.
I also put a 15mm amal carb and that fit on there perfectly.
I wish I could get the old autism kit, because there isn't a mild kit for the sachs. Its either 50 or 76cc's.
I think I am just going to port the hell out of a D cylinder and one of the extra cases I have,