I have my carb off for some general cleaning and new jets. I wanted to do the throttle stop mod, but it looks like it has been removed. I'm assuming it should be where that empty hole is, but would like some confirmation to make sure I'm looking at the right area. The manual is not very specific as to where the throttle stop is. If it is missing do I need one? The throttle snaps right back to the closed position after I have it fully open.