I have a question about rear spring rates. I have a 2003 YZ250. I weigh about 215 pounds. I read that the stock spring is rated for a rider about 170 pounds. I got on RaceTech's website and it said I need a rear spring with around a 5.2-5.4 rate. What I want to know is, is it worth the $100.00 to get a heavier spring and what will I notice from the change? What can I expect to gain by changing the spring? Can anyone offer me a little guidance. I'm not real up to date on suspension stuff! Thanks.