Thread: 4 Barrel Carb Linkage Modification

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What you're missing is how levers work.

Pulling a longer lever the same distance as a shorter lever results in less angular rotation.

In this example, the point where the lines come together at the bottom is the throttle shaft. The pull is 1" for both levers. The 4" lever would rotate about half as far as the 2" lever. That means you would have to pull the throttle cable further, resulting in more pedal movement.

Experiment with different lengths of levers, and you can tune your pedal travel.

Carb.jpg

Originally Posted by Henry Rifle

What you're missing is how levers work.

Pulling a longer lever the same distance as a shorter lever results in less angular rotation.

In this example, the point where the lines come together at the bottom is the throttle shaft. The pull is 1" for both levers. The 4" lever would rotate about half as far as the 2" lever. That means you would have to pull the throttle cable further, resulting in more pedal movement.

Experiment with different lengths of levers, and you can tune your pedal travel.

Attachment 62935

And to further clarify Jack's excellent post, from idle to wide-open-throttle (WOT) is right at exactly 90 degrees of rotation, from butterfly flat level to straight up. Your picture doesn't show it, but if the sheath of the throttle cable is not constrained at both ends that adds to your problem.