Never owned a 2009 ZX10R but owned a few Kawasakis
QUESTION 1: IS THERE AN ISSUE WITH A TWITCHY FRONT-END ON GEN 3 MODELS AND DO I HAVE TO WORRY ABOUT IT CONSIDERING MY RIDING STYLE/SITUATION?
Rake and trail numbers can give you an indication of how a bike will perform in the handling department. These are some stock numbers from some notable ZX10R gens
Rake: 24 degrees
Trail: 102 mm
WBase: 1385 mm
Rake: 25.5 degrees
Trail: 110 mm
WBase: 1415 mm
Rake: 25 degrees
Trail: 107 mm
WBase: 1425 mm
You'll see the numbers for gen 1. Shallow rake and low trail, combined with short wheelbase = track bike. Combine that with big power, light weight and no steering damper, and it's no wonder that the bike was considered such an animal back in 04.
My bike is a gen 4 2011 and I can tell you that bike is very stable at the front bordering on difficult to turn. The numbers for the 2008 are not so different, but you can see it has a shorter wheelbase.
I'd imagine the bike is a good comprise between the two extremes.
QUESTION 2: HOW MANY MILES CAN YOU GET OUT OF A FULL TANK ON AVERAGE RIDING NOT TOO AGGRESSIVELY?
You'll be lucky to get 120 miles to a tank (that includes reserve) on an aggressive ride. Cruising at 70 - 80 MPH (I'm from UK these are legal speeds...Well 80 is speeding but not much)...You should get closer to 140.
QUESTION 3: HOW DECENT IS THE HANDLING/COMPOSURE GOING OVER ROUGH ROADS? (RELATED TO QUESTION 1)
Kawasaki's are set up stiff, and generally until recently have had poor quality rear shocks that lack rebound damping. You will feel the bumps put it that way.
The front end on many Kawasaki's however is excellent, with great feedback, but again quite stiff, but the front generally has a better range of adjustment than the rear.
You have to remember of course that the bike was designed with one eye on the WSBK championship, so it's race track credentials trump it's road ones.
QUESTION 4: WHAT ARE THE BEST THINGS AND WORST THINGS IN YOUR OWN OPINION FROM OWNING A GEN 3 BIKE? AND WHAT WOULD YOU SUGGEST TO CORRECT OR ALLEVIATE THE WORST THINGS?
Can't really answer that, but I have heard that the gen 3 is a return to form of the gen 1. Gen 2 being a little bit soft.
It's an uncompromising bike and a little unsophisticated. Old school. Big power. Rider is fully responsible for not being an idiot with that power (not like today) oh and KIMS on the 2008-09 is not traction control and you can easily crash this bike by giving too much throttle.
It is set up like a race bike with not much consideration for the road.
I think it would be a great bike but if you are looking at speed and comfort from that era, you are probably looking at the 2008 Honda CBR 1000RR Fireblade and not the ZX10R.
If someone says oh but Honda is boring, they're an idiot. Stick a pipe on it and set up the fueling and you'll realise why that bike won so much