Anybody have anything close to my set-up? (see Sig) I'm tinkering with the back half of the carb, and was wondering what spring and jets are working for you. I just took out stock (what it ships with...std spring and 77 jets) went to purple (one less) spring and 75 jets. Took it for a minor spin in the Hood, but couldn't wing it. Felt a very small if any improvement.

 

You could build two engines identically, and when you went to tune need different jets & springs.

As for the springs: If you can feel the secondaries open when you floor it from low RPMs, put in a stiffer spring.