Messages

Thanks for the info, whats the issue with the filters with the capped ends? do they restrict air flow? Or do they not filter well?

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. 

Thanks for the reply, Im sure you have put together many of these motors so your method & opinion is great information for me. .   .   Joe

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.     

It's the shift cam stopper. (see parts 28-31)

Ok , Thanks - So it isnt adjustable, just gets screwed in tight? 

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

RD350: wider L axle slot
RD400: wider R axle slot (and the arm is about 1" longer than the 350)

Thanks for the info - The right slot is wider on the new swing arm, so it will be a 400 arm with a 350 wheel. I can fab what ever is needed to make it work but any information on what to do is appreciated. The new swing arm is 17-3/4" from the center of the pivot to the back of the axel slot.    .     

@Joe6v6 if you're unsure of the year of your bike, if your frame and engine numbers begin with 1A1-30xxxx or 1A1-31xxxx it's '77 RD400D.

1A1-30277 , so yes 77 400D . This bike wasnt quite a basket case when I got it but very close so several areas had mismatched parts. I should have looked into the wheel situation a little better before procuring parts.  .

also remember.. the large axle nut is on the opposite side from 350 to 400. so it -may- have a 350 swing arm in it as well.

The swing arm, where ever it came from was lengthened 3" so I didnt want that. I found a nice one on Ebay.  . 

6v6, DeLuxe Reverb?

Ive been building Tube Amps for 20 years or so, just a hobby these days.  . Blaze Amps

Yea , after spending several hours last night I came to the determination that the rear wheel is from an RD350. It has a 40 tooth sprocket so it makes sense. I had previously read that, as IR8D8R mentioned, Some 77 400's did come with spoked wheels, but I dont think thats the case here. I wanted to stick with the 400 stock 17-38 sprocket set so it took a minute but I did find a 38t rear that will fit. It is a JTR & matches the dimensions posted by SoCal250.  .  The brake shoes I bought were from MikesXS , discerption says 350 & 400.  .
 

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.   .   

Thanks! , Thats exactly the info I was looking for.    .   

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