having a problem under at low rev's seems like its over-fueling to me but im no expert, has a "60" on the jet for primary, is this to big as its the same as whats on the secondary, can see fuel pouring in under light throttle, this is on a 2L ohc from a b2000/courier with a nikki carb, cant see any specific number on the engine or the carb its self, any idea's ?