I have a couple McCulloch 32 weed whackers converted to model engines. They have C-H ignition and Abbell mefflers with a 1/2" carb on them. Turns a 18-8 @ 7500. They have a left carb and right exhaust.

I have two McCulloch 32 chain saws. The newer one has a left carb and right exhaust. The older Mini Mac is a front-rear job. They both have better timing and run faster than the weed whackers.

Enjoy,

Jim