Nova Engines .21/.24 Off-Road Complete Carburetor (1° Adjustment)

I have been trying different carburetors, fuels, glow plugs etc and cannot get the nova T6 and b5 engines to run correctly. I have killed a piston and sleeve trying to get the b5 to be drivable and have good mid range. These two circuit carburetors are the issue as I purchased the nova 3 needle carbs and was able to tune them perfectly. There is no value in the B5 and T6 engines if the only way to make them run well is to buy a carburetor that pushes the cost higher than the b5r and T6r that come with the three needle carbs.