PDX - you're thinking of the Yamahas. Their 3-cylinder machine (750 at first, then bumped to 850 after a few years) were indeed a bit gimpy here & there, esp. 2nd gear woes. It was the '78 ~ '82 Yamaha XS1100 that 'went like stink but handled like a bad smell'.
The Suzuki inline 4s of that vintage were the best (heresy to a SOHC 750 owner, I suppose). The first GS750 of '77 was Suzuki's first effort into inline 4-stroke 4's and they got it damn near perfect. GS1000 came the next year (both 2-valvers) and outshone the KZ1000, XS1100 and CBX as all-around superbikes.
After a few years, they bumped the 2-valver to 850 and intro'd the 4-valve 750 & 1000 (later 1100).
The original "standard" or supersports (E model) were chain drive. The shaft drive (G or GK) came in standard dress and sylish cruiser (L) dress after a few model years.
Eventually, they could be had in 550, 650, 750, 850, 1000 and 1100 cc slices, depending on year and model.
They had few weaknesses, but among them were a weird-Alice charging circuit that could burn their stators ($$) however, there are easy fixes available and well documented around in cyberspace.
That one looks like the standard shaft-drive model. If it's an 850 shaft drive, I think it must be a year or two newer than '78.
For $100, you can hardly go wrong.