I have been talking to JD and also kept tabs on Clark Mason, who heavily tricked out his 99 WR (and then sold it for an XR650). I took off the accelerator pump cover, drilled it with a #43 bit, and tapped it with a 4-40 tap. I have installed a 4-40 set screw, locknut and lock washer. This allows me to reduce the stroke of the diaphragm, i.e. the VOLUME of fuel squirted into the throat of the carb. By trimming off the tip of the AP actuating rod, you can alter the timing of the squirt vs. the position of the slide valve. My AP fuel stream DOES NOT hit the slide at all. I need to do the R&D on the set screw to set a reasonable squirt duration. I timed my AP squirt. It was >2 seconds! I am looking at ~ 1/2 second. I ASSUME I'll need to screw w/ the fuel screw/needle to accompany this leaner setting of the AP. JD has recommended fiber washers to seal the set screw against fuel leaks. I will try some teflon tape for sealing the set screw, at least for setting the squirt duration. If this works, I will stick with it for now. I will post everything I encounter. I am working midnight shift (got to LOVE IT!!) and testing maybe slow due to my impaired (more impaired than normal [is that even possible?]) thinking. Dudes, thesee 99's are on their way to success!!