This is an interesting thread about updating your carbs. Please keep us posted as to what jetting you wind up with. I am sure many are watching and can benefit from your work.
I am impressed with the expertise shown here, machining skills are impressive as well as just good engineering, it is not wrong to build on other's engineering success. Really improves the breed.
Finishing my 86 XT600 I purchased new and rebuilding an 84 XT600 with top end problems for a Colorado Trip next summer. Running a Zeeltronics programmable CDI on the '86... Testing out well...