Small engines seem to be part of most homesteaders’ reality. Chainsaws, mowers, generators, weedwhackers - whatever.
As part of a frugal self-reliant lifestyle I’ve never quit learning more about how to maintain and rebuild the small engines I have. There are many online sources for info, but I thought I’d mention two that I like quite a bit.
One is a Youtube channel,
donyboy73 - this offers a tremendous wealth of detailed and well-presented information by a professional small-engine specialist. The videos are clearly shot, well-paced and easy to learn from.
https://www.youtube.com/user/donyboy73
The other one is a forum that you can join, to put your question and get answers. It’s quite active.
http://www.mytractorforum.com/44-small-engines-repair/
By the way, I’m all for the development and availability of battery-based electric power equipment. Just a personal opinion, but when you get beyond drills and circular saws (etc), I consider a lot of what’s currently available is early-stage - time and the experience of users will give the manufacturers the feedback they need to evolve the equipment they put on the market. It seems like it could be a fair while until our gas-powered equipment is phased out with electric equipment available at modest prices. So, good to know how to keep things running nicely.