Years ago when I modded my air box and jetted my carb one of the things I remember doing was drilling two holes in the slide just slightly larger. That allows the acv diaphram to return quicker. But for the life of me I can not find the reason or why I did that. I thought a drill bit was included in my JD Jetting kit. I just read the JD instructions and can find no reference to it. I also used an old post on the web that originally refered me to a few of the mods to the DR-Z. Does anyone out there remember where that suggested mod of drilling the slide came from??? I know for certain the drill bit came with something I just can't remember where???? Also the increase in hole was not that much larger. Bueller? Bueller ???