How to properly drill carb jets?

12many said

Somehow missed your thread when it mattered, but I have that same carb that I was using on my 410, had the same deal as you. You mention primary jets sized from 76-82 That is the kit for the 625 carb. You need the kit for the 750 which comes with 87/89/91 primaries, as well as 54-38, 56-40, and 58-44 rods. What rod were you running with the 82's?

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I got the kit for the 625 because I'm at high altitude and it needed to be leaned out from factory. Now I'm running #87 primary jets and 62-54 metering rods, I had to richen up the secondaries "back" to the factory #86 jets and now it's pretty much spot-on. I could possibly even go one step leaner on the primary side, I have 64-56 rods for that.