I started Nitro this season and run Extech Fully Modded in my truggy. I have had my car stick couple of times as to where I couldn't get over jumps. I pulled my idle screw and it had a bad bur on it and I am in process of buffing it out with mothers and dremel pad as specified in trinity thread. I would like to try a VZB carb but want to ensure this is right one. My buddy told me their are 2 versions of VZB. Here is part (OS 21 VZB Engine Parts 21J Carburetor V-Spec). Also I have a Ninja BO1 MR21 and wanted to know if that carb will work since I was told this engine and VZB are the same. I am happy with power but I agree these carbs are week.