QUESTION: Cant I just click the front forks stiffer rather than replace springs for my weight?
Sorry..but like Fred sez..you need different springs. You can get a set of late model XR400 springs (.40s) that will do the job just fine. If you don't want to change 'em yourself, consider the cottage grove yamaha shop. It's right up the 'street' from you and richard wilson will do it while you wait if you talk to him about it first (don't just drop in).
RE: adjusting the clickers.
Talk about it all the time...just not as a substitute for the correct spring. Check out most any suspension site (mx-tech for example). Jeremy has a write up on how to set the clickers. It doesn't take much to make a big difference in your ride. XLNT riders (heh..not me!) can tell the difference in ONE click. I've done some sneaky click changes (one) on my riding buddy's bike. He knew it immediately!
Hey...we're likely going to do some riding on john's peak sometime this coming weekend. How's your time for coming down for some riding? Got your 'jet package' yet? (like prolly 40-42 pilots and 142-45-48 mains). C'mon down and we'll change 'stuff'.:)