Thats the linkage I'm going to change to this winter.
With my hex linkage, the 3-4 side carb opens a bit sooner than the 1-2 side carb and I can't adjust it out. This is because my downpull bar is way more towards the 3-4 side and causes a funky rotation on the 1-2 side bar support.
The bellcrank linkage is the way to go, it looks like it is designed to pull both throttles open at the same time.
Sandeep
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