I believe itís time to replace the HH100 in my Ď67 112. A few years ago I picked up a great donor engine. Itís a HH100 out of a Sears tractor. Itís a Solid State engine so itís of low hours or at least looks as such. When I went to look at the engine, the seller allowed me to remove the head to inspect the cylinder and piston. Itís a standard piston in a relatively unworn cylinder. Iím planning to disassemble this engine shortly and also disassemble the original engine. My original engine breathes really hard and is worn well past a rebuild. Two years ago I pulled the head to decarbon and saw the cylinder to be worn to the point I can fit over .060Ē feeler gauge between the cylinder and piston! That was when I started searching for a replacement engine. I need to inspect both engines to see if there will be any other parts needed. Iím already assuming Iíll need to use the original camshaft (I sure if the solid state camshaft has the eccentric for the points plunger), and use the side cover since I donít think Iíll be good enough to drill the points plunger hole. Being this is working tractor I want to do this as best as possible with longevity as the main goal. So Iím not sure yet what Iíll do as far as bearings. Iím noticing in all the rebuild kits Iíve found, none come with bearings, so Iím assuming as long as the ones I have are in good shape, that Iíll reuse them. Iím also not sure what Iíll do as far as piston goes. Iíll have to decide that once itís disassembled and measured.