Just swap everything over from the old engine to the new one. Use the same flywheel and clutch. I think I had to use a couple more clutch shims but other than that everything swapped over. The only thing I had to change was the linkage because the AE .12 had a rotary carb and the new engine has a slide carb.

You sill use the same linkage just change the setup on the servo horn. The manual shows exactly how to do it.

Oh and one more thing the Picco has a larger carb opening so I needed a bigger air filter. I used one from a Losi LST and it worked dandy. You could also use a Traxxas TMaxx air filter or something similar.