Building motorized Bikes. I'm well versed in bike ridding and maintanance, and in 2020 I started mounting 2-stroke engines on them. It's nice hobbie to learn about internal combustion engines, because it is very cheap and very diy. The community is nice (they still use those subject spefic old forums).I don't have to care too much about registrations and rules. I use the bikes I build to go where I'm too lazy to pedal.