Jag ---For your 145 lbs, a .45 spring is way too stiff [38 is probably about right]. You can put a lighter spring in one of the legs to get an intermediate weight. You said you have the Kaw tool but cant get it apart - well, you're going to have to. Drain it real good, even rinse it, then heat the bottom end of the sliders to around 300 deg. They use a locking compound and the first disassembly is usually tough. Loctite "melts" at 365F and will soften substantially by 300. There's not much in there that heat will hurt [there is a plastic bushing at top of cartridge in the newer forks]. The "clickers" affect LOW SPEED COMPRESSION only - which is exactly what you want [to increase] for jump faces. For rocks, roots & other sharp terrain, you need to adjust the HIGH SPEED COMPRESSION and this can only be done internally by revalving. With an '89 you may not have cartridge forks and may not be able to replace the base valve with a Gold Valve. On my '99, I scrapped the junk stock base valves and installed the GVs --- going way soft on HSC. This eliminated all of that KDX harshness you feel in the bars -- and probably the best $$ spent on any mod so far. Try race-tech.com and see what they offer for your year