I lowered my 2009 FZ6R front 1 7/8 ” to accommodate my woodcraft clip-ons that replaced the handlebar. I lowered the rear 1 3/4 ” to accommodate my 30 inch inseam. I have had the FZ6R up to 128 mph in the lowered configuration with no problems with stability. Low speed stability is better losing 5 lbs of high weight by replacing the steel handlebars and mounts with the aluminum clip-ons and losing another 5 lbs high weight by switching to a lithium battery achieving a lower center of gravity. I weigh 185 lbs and have my rear shock on number 4 which has decreased my sag in the rear. My suggestion to you is that you change your rear shock setting to 2 or 1 from the factory setting of 3. This will increase sag in the rear allowing your feet to get closer to the ground at a stop. If you do lower both ends you will need to replace your kickstand for a lower one. I replaced mine with a T-Rex adjustable version. Do a google search ( the forums search engine not so good) and search on “FZ6R Lowered”, “FZ6R Lowering Link” and you should find all the instructions needed to accomplish this project in the FZ6R forum. My FZ6R was a swan before lowing it, now it’s a hawk.
HD How-to Adjust rear-spring preload on a Yamaha FZ6R - and test ride - YouTube
man I really want clip ons. but ive spend to much as is.. maybe next year for my b day