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I assume these are the stock carburetors,77 RD400, what are the inlets in the middle. Are they overflow for the float bowl? What are the other 2 smaller diameter inlets? Where should I run these lines to. Seems very difficult to find a diagram of all the lines that come off these carbs. 

The next thing im going to do to my RD400 is install the top end. The cylinders have been bored & honed, the pistons are fitted to the rods. I am just wondering what the consensus is as far as the base gaskets, do you install them dry? Any type of sealer? For the head gaskets my gasket package came with the copper gasket with the raised rib. On the head bolts any assembly lube? In my experience with car head bolts Ive always used ARP Assembly lube.  .   .   Any info or guidance is appreciated.     

Looks like an adjustment for something but I cant find any info. This is not my motor   , just a pic I found.  . 

I bought new sprockets & chain for a 77 rd400. The RD has a spoked rear wheel with drum brake. The rear sprocket I purchased has a 110mm bolt pattern, the existing sprocket & wheel has a 92mm bolt pattern. What sprocket fits this wheel? Is this an RD400 rear wheel? I purchased rd400 rear brake shoes & they were correct. I cant find any info as to an RD with this bolt pattern. Any info is appreciated.   .   

Hello - First post here, more to come. I recently acquired a 77 RD400 and have been in the process of gathering information and ideas as to what this bike will evolve into. .  .   If I were to wire this bike similar to the attached drawing would the pictured resistor be still be necessary? Thanks for any info : Joe