Re: Something new and kinda sorta 100 years old looking
If there is a hole, even 1/8", to relieve crankcase pressure, it is actually a leak that steam may come out of quite strongly at operating pressure (trying to move the bike). It may result in burns on the legs, or oily residue on the bike.
If you try it out and it looks to be a problem, you can just replace the cap, but that might be an issue.
This is fun! I like how you let people interact without getting upset by us bench racing here.
1" roller Dax Friction Drive and Tanaka 3300 with mods.