Engine Inline 1 v2

This was a engine I designed and printed, however it is defunct. There are several design flaws, the major one being with the gears for the camdrive, and that those are nonexistent or hard to get. Additionally to this, there should be a ballbearing which I elected to ignore(for some reason). Another issue would be the difficulty of producing some of these parts if you are inexperienced. Yet another issue is that i have not yet decided on what sparkplug to use, so the cylinder head is not really useful. Added onto that is the large combustion chamber which makes for a very poor compression ratio.. Although i have thought about designing one myself, that has not happened yet.
*springs have not been added between valve case and valve foot. As spring constant has not been decided on

The rest of the design should be relatively solid, with a 20mm bore and 10mm stroke producing about 3cc. The carburetor should be able to function fairly well although some parts are very thin which is goin