No company only makes "good" engines, and no company only makes "bad" ones, and what defines "best" and "worst" differs across brands. An engine might be mechanically sound, but commercially ...
Inline-four motorcycle engines earned their "screamer" nickname from the distinctive exhaust sound their high-revving engines ...
While major motorcycle manufacturers produce a wide range of impressive mainstream bikes, the custom-built world of motorcycles is far stranger, with some examples that seem to break all the rules.