Motorizing a bike with full suspension.

[Nehmo]

I have to scrap my newest e-bike because the rear suspension has begun to twist. There are two basic types of rear suspension, one has a U shaped lower arm with two articilated arms that act on a rocker to a spring(called a "shock"), .

I've seen the term 4-piece or 4 part rear suspension used. It comes in several varieties. I tried once to evaluate the relative merits by searching and reading, but I didn't come to a conclusion. The 4-part allows more travel, though.
I do agree that having a "full" suspension is superior to a "hard tail". Some people claim a rear suspension robs power when pedaling is used.