I weight ~175-180 (5’9”) and would bottom out my fork ALL the time! Two days ago I put in 15wt oil and made two 6 inch #40 PVC spacers to replace the stock 5.5in spacers. WOW!!!!! What a HUGE difference! It's a whole new bike in my eyes. This mod is a MUST!
I rode it hard on some dirt on the way home yesterday and I couldn’t get the front to bottom out. I rode fast washboards, caught air, hit a curb going pretty fast and went down steep inclines. Best 11 bucks I've spent on this bike....other than a tank of gas.
As for the rear, I'm looking into eaglemikes raising links (RL-2)...if those don't do it, well see from there.
Do a search on klr650.net. You'll find all this info over there.