I am sure this has been discussed before.  Sorry to ask again, but I could not find what I was looking for in past posts.
I have been told that new chains are stronger and better in general.  I have been told that 530 chains are stronger enough to work fine in a XV920R, similar to the TR1.  I can get 530 chains and rear sprocket, but the hard part is the drive sprocket, often called the pinion.  Does anyone know of a Yamaha front sprocket fitment for this bike?  Does it require shims or special machining to do this?
The goal is reduced weight, friction, and therefore a modest improvement in response and power.
Can you direct me to previous posts about this?

Thank you for your reply.
The translator may not be very clear.  I am not sure what a spark eroder is.
What modification needs to be done to an XS650 drive sprocket?

That is a very specialized process.  Very cool, but probably not available to me at a reasonable cost.  For just one XS650 sprocket, drilling slowly is probably my answer.
Is that the only machining to be done on an XS650 drive sprocket to get a 530 chain conversion done?
By the way, I have two SR500 motorcycles!  One stock and another being converted back from a race bike to a street legal cafe racer.

Thank you Bruno.
This bike is a new purchase and I am looking it over carefully.  The bike has 83,00 km on it.  I do not trust the chain as it has a few stiff spots where it appears to be binding up a little bit.  The bike is old, so age is probably more of an issue than km.  When replacing a chain, you should replace the sprockets too.  I always ask myself, is there a performance upgrade available?  As I said in my post, newer chains are better and stronger.  A 530 chain is strong enough, yet lighter, so it should accelerate faster and have less friction.
This is not a race bike, so a logical question is, will I notice any difference?  Will it be a pain in the ass to do the change?  Am I saving any money?
You are probably right to just stay stock, but it is winter and I have the time to investigate it before springtime riding season.

Sorry for the double post.
I do like the chain case, so I am not removing it.  That is one of the design features that I really like about the bike!

Salute....

If the bike has not been moving for years, it is possible that the grease has
dried out a bit, which affects mobility.
Put the bike on the main stand and let the engine run with the gear engaged
for 10 minutes, ... the chain is like new again. (... with grease in the box, of course.)
If the sprockets have no (minimal) wear, the chain is also in OK.
The weight should only make a difference of about 200g,
depending on the model (American / European).

I think the increase in performance is a fairy tale, ... go to the toilet before
the trip and only eat something after the trip,
... and you will have a better increase in performance / acceleration. 😁Hi, hi ...

One more note: Under no circumstances should a chain with an O-ring
be placed in the chain case, otherwise it will destroy the chain and the
rubber hoses of the chain case!!!
Greetings Bruno

Hi, ...

...fresh grease would be advisable. Use lithium grease (specifications), which
is very pressure-stable in the joints, ...although other greases can also be used.

Tip: Pay attention to the ventilation in the chain case, see answer #17:
https://www.tr1.de/pages/forum.php?iQuery=num=1700227351/17

Speedometer see here:
https://www.tr1.de/pages/forum.php?iQuery=num=1728890516/0
Greetings Bruno

Ps. Take a photo of the bike.

Yamaroel,
You say not to use an O-ring chain, then you say you have done it for 60,000 km?
Did you remove the enclosure?

Grandparipper (btw, whats your real name?), Roel cited Bruno but he did not mark it as a cite. In general Bruno is right, a chain with o-rings should not be placed into the chain case. And there should be some fluid grease or oil in the chain case, the oil transports the heat from the chain to the case. If it works for Roel this is fine but its not neccessary. Just keep the original chain and go riding!

Thank you all.
I will clean and re-lube the chain, inspect carefully the sprockets, clean and re-load the case and tubes with grease, then ride it for a nice long trip.  
By the way, I have ridden for several trips, including one for over an hour since I purchased it, so it has had time to heat up, melt the grease, and flow through the links.  
Thank you all for your help and insights!  I appreciate it.
More updates as I go through the rest of the cleanup and improvements!

Thank you both, Greg and Bruno.
I got a new 630 chain and opened up the chain case and thoroughly cleaned the old grease out.  I have the correct EP1 grease to fill the case and I got a new left side case gasket.  To get the side case open, I had to remove the primary chain drive cover.  Is there a gasket on this?  I don't remember seeing one when I took it off.  It would be 'C' shaped.  I see a black rubber or plastic seal covering part of the area.  I don't want grease leaking out or water coming in.  Should I use some sealant on this part during reassembly?

Hello Grandparipper,
please have a look at the Parts List:
https://www.tr1.de/technics/microfiche/Parts_XV1000%2782-19T-EU_(en).pdf

herein:  D6 (Page33) - D7 (Page34)  / Rear Arm     and      E5 (Page46) - E6 (Page47)  /  Rear Wheel

On D6 Item 13 Oil Seal    ; on E5 Item 14 Clutch Hub   :

Note: During the Time the Oil Seal inner Seal-Lip can building a groove into The Clutch Hub contact Face.
If it is there a little groove, try to plan it. Outherwise a new Oil Seal will have a short LIfe.  The Pairing between Rubber and Aluminium greating a friction head with destroies the Sealing Lip of the Oil Seal.

Regards Anja

Hi Gary,

...which bushing??! .... if you mean No. 17 (drawing)??
...then the back cover must be opened again.
This bushing serves as a spacer; otherwise, you can't tighten the axle,
and the chain case will break.
Perhaps there's enough space if the cover is only opened.
Good luck.
Regards Brunò  

Hello to All,
a grnaral Note:
Yamaha Sealant, or Bound.

In laste November I ask a mechanic of the lokel Yamaha Store which shall be the Yamaha Bond (grey)?
Answer: Normal Silicon Sealant just in grey color.

So RTV, Dirko, etc

Regards
Anja