It's not that the linkage isn't strong, it's that the ball and socket joints each have a little slop in them, as does the pivot piece that connects to the throttle cable. Each little bit of slop multiplies to the point that you have a trouble in getting the carbs to open evenly. You can set the balance and idle just fine, but one always opens farther than the other causing a rich vs lean condition that the balance tube just can't compensate for.
The biggest problem, however, is that the bracket that bolts to the block and fab shroud (at the generator backing plate) doesn't allow for full throttle! The swing arm hits it. The ball (for the socket/arm that connects to the cross linkage arm) was placed wrongly and the angle iron bracket interferes even worse. You never get full grunt out of your carbs/engine. It's worse if your engine is cammed for the upper rev range, then you're never in the sweet spot.
Weird, huh?
Luck,
TC
AJ at Low Bugget goes a step further with his linkage, in that he refines the connecting joints to where the is no play in them at all. VERY PRECISE, nice and slick. We're running it on an engine that has his heads, cam, and Kads on it and it's a real treat. A perfectly designed package of parts.
