I've had nothing but trouble out of the rochester B and monojet on my 54 3100. I had a whole box of the B's and they all would black the plugs.and seep gas out to the outside. I read somewhere on this forum that the fix for this is to switch to a Carter YF 966 which is a direct replacement for the B . It fits and runs perfectly, like never before. The trouble with the B mostly is with warped castings. Forget the monojet it also fits perfectly and is better than the B, but it has trouble too. The trick is to find one of these carters and be prepared to pay the price. Sincerely, Gene Weaver
