got a 69 in parts 
looks like there a plug part number 17 in picture in manual but then number 17 doesnt exist i  writing.  what is this hole do i have to have a plug for it?  and anyone know what its called?  it seems like i could be missing something since got it in parts and seems like shift drum is in this section on other side.  its not supose to stay ooen to let oil flow is it?  what is point of this hole?  looks just black in pictures i see so far.  

ok i look at partzilla page and looks like its a drum plug but like is this needed?

If you mean 14 in this link, yes its needed or the oil will escape past the selector drum. It's a rubber encapsed steel cupped plug. Could spin up an alloy one that's a nice tight tap in fit.

www.partzilla.com/catalog/yamaha/motorcycle/1969/dt1b/shifter-a

theres one that looks like a plug shuved in , then theres one that looks like a cap.  does it matter?  can i buy a plug or cap from lowes?  theres a pic of a engine and it looks like a plug then there selling nos plug cap and its a cap.  it doesnt seem like the nos comes with metal clamp or see one in diagram.    i guess part of case goes over this so it does matter what it looks like.  do they or yall sell aluminum one?  or me spin haha i never spin anything before but dollars.  is it easy to spin?  i do have like a piece of aluminum.  how much pressure does it hold?  um guessing not much just has to hold when tilt?

Better have a pic of your motor so we can be sure we're on the same page.

i ordered rubber one like a cap style from ebay. maybe i have stppoer style here that would work. seems like some stopper style one have metal in top? does a screw screw in like a boat plug or woyld a boat plug work? anyhow it was like 10 bucks plus ship so wallet wise it might be best to buy a 2 dollar stopper or 4 dollar boat plug if thats even possible to work. never shopped rubber caps so i dont know. anyhow whats the point of a blind hole anyhow?

ignition is next part. im missing boot if original coil is still good. know what resistance boot is..? or coils should be i gotta look it up.