[pdwestman]

At 6' 4" (how much do you weigh?) I'll suggest that you should contact Eagle Mike for Rising Links for your Gen 2 and possibly even inquire about using EM Gen1 Rising Links on your Gen 2. Which would be even taller.

https://www.eaglemike.com/raising-links-for-2008-later-KLR650-8rl.htm

As to seat, The 08-14 Gen 2 seat is stiffer foam but same height and shape as the 87-07 Gen 1 seats.
The Gen 2 2014.5 (&up) New Edition seat, front 1/3rd is same shape, firmness & height as early Gen 2 but rear 2/3rds is widened like a Corbin or Sargeant full height seat.

 

[pdwestman]

If I'm not mis-taken, Maverick has a 2008 firm foam, standard shaped seat. Not a New Edition (2014.5) wide in the rear 2/3rds area model.

But you can't beat his price tag.

 

[pdwestman]

Ut-Oh, you ought to try an OLD Maico!

 

[pdwestman]

Of course, raising the suspension makes no difference to the riding position. It will give the bike more ground clearance, and allow the rider's legs to be a bit straighter when sitting astride the bike.

The extra ground clearance may be handy. However, I don't think raising the suspension will offer any benefit to a taller rider in terms of rider comfort.

That depends a lot on rider weight and physical build.

The 2008-2014 models had pretty soft springs as compared to 2014.5-2018 models.
The raising links will physically raise the un-laden seat height as well as increase the effective progression of spring rate in its travel.
So this is a fairly inexpensive way for 200lb + riders to firm-up the rear suspension on the early models.

I'm only 6 ft tall, 165 lbs, but with 36 inch legs. A friend of mine is 6" 4', 300+ lbs and only 32 inch legs. He has to stretch to get a leg over the KLR.
I don't squash a seat or the suspension much. But my friend squashes everything.