Hello, I am putting my 1980 cm400t engine back together after having some work done on the cylinders, and buying some new oversized pistons. I also picked up a complete engine gasket kit. Here is my question, as I was putting the cylinders back onto the crankcase I noticed on the CMSNL website engine diagram o-rings that look like they go between the crankcase and the cylinders. I don't remember seeing these when i took the engine apart, but there are some o-rings in the gasket kit that look like they would go there. With the o-rings in place the cylinders are not able to mate very good with the crankcase (although I haven't bolted anything down yet). I feel like they don't belong there and before I go too far, I thought I would reach out and get some of your thoughts. Thanks.