Im new to the KX500's and Just picked up this 88 to turn into a cheap Ice Bike. It was not running and tore down, Im getting everything ready to reassemble after the Cyl gets Bored, I noticed one tooth on my KIPS is broke off, is this problem or nothing to worry about?? all the other teeth look fine?? and the Cyl seems to be missing what looks to be a Bridge in the center of the intake port, is this a common Mod or did it break and someone grind it down. Pics are below