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I have a pair of chrome DG's!  Been looking for info/pictures on them for years. The picture above is the only one I've ever seen.  Found them on eBay a few years ago while hoarding parts!  I figured they would be more for show than performance. I also have a pair of beat up spec II's that I would like to "restore".  Looking forward to the comparison (once I finally get the bikes back together).

Not mine! I rarely see chrome DG's. Are they custom or were they actually sold at one point?

https://www.ebay.com/itm/402336286239

[url https://www.ebay.com/itm/402336286239][/url]

Looks like an nt650 hawk gt in disguise!  I have one too! I also have a gen 1 sv650!  I also am back to working on my rd/r5 - it's currently in boxes.  I'll be following this one!

I just rebuilt two of these and I think I may have come across this same issue. On one of them, the plug came out. It was a little rubber plug with what looked like epoxy/glue behind it (on the open end). The rubber part faced the plunger.  During disassembly, I noticed it was loose and knocked it out from the plunger side.  There is a small lip that prevents it from traveling in the opposite direction.  Upon reassembly, I pushed it back in as far as it would go (from the starter wheel side) and followed it up with a small dab of jB weld.  On my second pump, the plug seemed fixed and did not budge or come out so I left it in.  I looked for documentation on this plug and found nothing so I assumed it was not meant to be removed.

Time will tell if it holds and I am far off from a running bike so I am really just confirming your findings.  I did not see a replacement plug in any of the rebuild kits I saw.  Hopefully my descriptions make sense as I failed to take pics of the little plug.   Good luck!  Hopefully someone with more knowledge will chime in!

You guys (Supertune & Yamaha 179)helped me through this way back when on the old site!  I had the same question!

The R5 cranks are heavier with thicker webs. Critical dimensions are the same - thus they are interchangeable.

The "connecting rod gap" - don't know the formal term- is smaller on the r5 crank (thicker webs) by about 1mm.

The r5 webs are about .5mm thicker. I have 1 of each. The r5 measures 21.4mm (roughly) and the rd is around 21.05 (roughly)

As has been concluded - it appears you have an RD crank.

I guess it comes down to what is the benefit of spinning a lighter crank?

Unfortunately the cranks exceed the limit of my small scale so I can't get a weight difference.
Pics on my phone are too large to upload....

Push it into the tank. Then grab it with some needle nose pliers and pull it out at an angle. I had to replace a few and that's what worked for me!  Good luck!!!