The main line shaft and it’s drive wheel, a floating input jack shaft, tensioned by engine positioning, and two hand sewn belts made from 3D printer drive belt material.
The belts I sewed using 4-0 nylon suture needle and thread, after tacking the belt ends together with thick CA.
The pulley wheels are maple, everything else is 1/8 Baltic birch ply. The shafts each run on two ball bearings in pillow blocks made with a scroll saw and fly cutter to do the bearing bores.
I set it up tonight, wedged the intake valve open a crack to keep the engine from pumping fuel, and gave it all a spin by hand. Everything looks happy enough to go forward with a docking “sled” to position the engine and tension the input belt.
As you can see, it’s a true kitchen table project. One of the perks of living solo.