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So I figured out the problem...

The PO installed hex head type screws to hold the oil pump in place and replaced the panhead screws.  The smaller diameter of the hex was not putting the same kind of force on the edges of the pump.   When I switched to the oem screws with the larger head surface area, it sealed right up and hasn't leaked.

So my oil pump gasket was leaking so I replaced it with an nos one from yamaha.  Surfaces were cleaned and prepared carefully.  Still leaks, but not quite as bad.  So I ordered another one and I guess I'll use some yamabond or similar. Is there a supplier that makes a better/high performance gasket?  Like Cometic for SBC. Any other thoughts welcome...

Found my nut!

These all have to be retorqued.  What's the torque value? Its it necessary to bend both tabs?

Thanks for the links!!

Been riding it for a while now working out some bugs.  Checking torques, fluids, syncing carbs,  new plugs, the usual.  Does anyone have an owners manual on pdf... The one that would have come with the bike?  I have the Haynes and parts list.  Thanks for all the advise, looking forward to my next smoker!!!

Long shot here but found this nut in my driveway after a ride this morning.  Everything looks in order.  Maybe it was "lost" on the bike years ago.  God knows how many I've left on bikes...

First ride today was a blast.  It was such a unique experience with the way the power was delivered and when I wasn't whaling on it it was really comfortable to drive.  Everyone from the Harley guys to the nice old lady at the gas station had to check it out.  Maybe its my weight      but I found the bike quick not fast, but I guess thats what my 1000+cc bikes are for.  Overall, a keeper.

1. I need some oils for this 1977 RD400.  Transmission and engine.  I dont mind spending a buck, I just want the right product that I can buy from the local Yamaha dealer.

2. When I put the bike in neutral, both the oil and neutral light illumnate. Is that Normal?

3. See attached photo for third question...where and what the heck is this vent tube from?  I thought maybe the battery...

4. What kind of mileage should I expect out of a full tank of gas and a full tank of oil?

So clearly I have a few parts to begin to assemble.  Are there and other Yamaha bikes in that time period that used the same parts?  Like the directionals from an XS series, that might be an easier find that are the same?  Id like to get it back to stock.

I'd take one!!

I live in West Boylston.  Here is a pic of the new bike and some of the others.  I pick up the RD at the end of the month.  Other than the seat and mirrors can anyone tell me what else is wrong with the RD?

So after years of owning 4 strokes about 400 of them, I finally bought my first real bike!  I look forward to being part fo the forum!

Bruins in 4.