[kountzecobra]

The secondaries should be open just a touch. I just went through all this on a 521 I just built. It wouldn't idle well until I opened the secondaries a bit. Just make sure the transfer slot is not uncovered. If it is, then drill the throttle blades. Very rarely do they need the holes drilled. Usually only on engines with a lot of cam overlap. I can't see any use for the 50cc pumps on your carbs. Remember, there are two pumps feeding your engine, not one like most. Go back and try the std pumps, but be sure they are properly adjusted and don't bottom out. Try jets around #60 to #68