I forgot about the HU series Tillotson. I just rebuilt one for a 12 in. Skil chain saw. Great little carb.

I have modified my Zama by blocking the two holes in the throttle plate and soldering on a throttle arm extension.

I used a nylon aileron belcrank and nylon ball socket links for the throttle linkage. The pivot bolt was threaded into the cylinder base flange and works like the factory put it there.

Now I have to machine a velocity stack.