Progress.  Thanks for those pics of the air bleed and needle jet.  So, now we know you have a 5C17 needle, X-6 needle jet, and a main air bleed that is fairly small (it looks similar to mine but a measurement is in order).  Very interesting info.

The parts fiche shows that the US Models came with a 5C16 needle and a X-8 needle jet from 1986 through 1995.  Then, from 1996 through 2019 the US models were delivered with a 5C39 needle and a X-7 needle jet.

There are some confusing aspects to the fiche in that the needles are identified as 5C39 from 1996 through 2009, and are identified as 5C17 from 2011 through 2017, and not identified at all for 2018 & 2019.  But all of the needles from 1996 through 2019 have exactly the same part number (13383-24C40).  I have one of those needles hermetically sealed in the original plastic package, and it has a genuine Suzuki label with the part number 13383-24C40.  You can clearly see 5C39 embossed on the needle.  So, the US delivered early models used a 5C16 needle, and the late models used a 5C39 needle.

The only difference between the 5C16 and the 5C39 is the number of grooves for the eClip.  The 5C16 has three grooves, the 5C39 has only one groove.  The tapers and diameters are the same.  

Since it appears that the 5C17 and the 5C39 are the same (they have the same part number), I'm gonna take a leap of faith and say your 5C17 needle is essentially the same as my 5C39.

Now the interesting part.  Mikuni needle jets are identified by a letter followed by a number.  The numbers range in size from 0 to 9.  Zero being the smallest in that jet configuration, and 9 being the largest.  You X-6 designation indicates that your needle jet is one size smaller than a late model US LS650, and two sizes smaller than an early model US LS650.  On the US bikes, they leaned out the jetting on the late models, but your early model has a leaner setup than a US late model.  That seems odd.

Is there any chance that your carb, or the parts currently in your carb, are from a LS400?

If your main air bleed is .024", I suggest you procure a needle jet for a late model US LS650.  You want part number 09494-00861.  Use that needle jet in conjunction with your 5C17 needle, or procure a new 5C39 needle, part number 13383-24C40.  Using the X-6 needle jet you currently have will only aggravate what looks like a lean condition.  Your plug is really white.

This shows how the limiter stops the slide from lifting all the way.

Rode 300kms. Only minore puttering and hesitation at high revs again. Stock needle reinstalled.

Bike reached 140kmph easily. A couple of little rich running moments as I could smell it. Maybe the needle got stuck due to the crappy broken  spacer. Got 240kms out of a tank.

Here is the plug

So the bike did a total of 720kms over 2 days. It ran really good
Will need to buy a new needle for the jet. I will also try a bigger main jet this week.

I took Dragbikemikes advice on what filter to get. The one you are trolling me about on Facebook is too small. I tried it and it bogged down bad.
Like I said earlier, I have a hard PVC sleeve over my carb intake. It is impossible for me to block my oval port.  The bikes running extremely well now. Just need to fine tune the jet sizing. Have done 900kms since Saturday

I had over 15 Savages, listen to me