At the beginning of this year I changed my fork oil height to 100mm on my 2000 yz426. This make a big difference on all track surfaces and jumps. I have got faster during the year and found I am bottoming again on most big jumps. I bought my son a '04 yz250 in October and couldn't believe how much difference there was in the suspension. The yz250 was a lot stiffer. Over the last 2 years I have put on 20lbs. I am around 210lbs and its time to put in stiffer springs. As my 426 is a european bike the fork springs are 45s and the shock spring a 54. I was going to change them to 47s in the fork and a 56 on the shock and run the oil height at 110mm (with a view to change to 100mm). I was only going to change the fork springs originally but I was worried if not changing the shock spring would make the bike feel unbalanced. What do you guys think? How easy is it to change the shock spring??