There was mention on here about hex bar linkage being good but no comments on what makes it good. Here's a few photos of why I think they are junk. The first photo shows the throttle levers installed the normal way on the hex bar. The next shows them reversed so I could check to see if they are drilled perfectly on center to insure their pull/push radius is the same. The third photo shows that they are not. The holes are off by almost 1/8". This means that they will never pull (or push) equally at the carburetor throttle plates making carb. sync. impossible at any position. Just to be sure about this, I installed appropriate pins in both ends of the levers and measured the inside distance with a micrometer (Helios caliper) to see what the difference was. .104" was the difference. The fourth photo shows it gets worse. When you tighten up the two set screws on each lever they move even more out of alignment and each time you loosen and re-tighten them, the alignment changes to something else. About the time you think you got them pretty close to sync, the throttle stop screws aren't touching the stops on one of the carbs. Lastly, IF you get everything in sync, go stomp on the pedal a few times while taking a cruise, they will not be in sync by the end of the day. The set screws get just enough torsion on them to dig in and change the lever position slightly but enough to create that crappy "out-of-sync" performance at cruising speeds
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