You've been mostly-dead all day.
DTT BOTM WINNER
I shaved the YZ reed cages to fit the RD intakes. I assume this was the thing to do vs porting the cylinders.
Your RD400 probably didn’t start as a pile of random parts like this bike. LOL I think it’s actually more expensive to restore this bike stock vs making the piles of parts I have work together.Makes me glad I stayed with stock on my RD400c build. Going with different carbs probably negates any need to worry about the original arrangement and gives you a clean sheet to develop your own setup.